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Castellini S, Brizioli M, Giraudet C, Carpineti M, Croccolo F, Giavazzi F, Vailati A. Modeling and correction of image drift in dynamic shadowgraphy experiments. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2024; 47:25. [PMID: 38587607 DOI: 10.1140/epje/s10189-024-00413-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2023] [Accepted: 03/03/2024] [Indexed: 04/09/2024]
Abstract
The study of phoretic transport phenomena under non-stationary conditions presents several challenges, mostly related to the stability of the experimental apparatus. This is particularly true when investigating with optical means the subtle temperature and concentration fluctuations that arise during diffusion processes, superimposed to the macroscopic state of the system. Under these conditions, the tenuous signal from fluctuations is easily altered by the presence of artifacts. Here, we address an experimental issue frequently reported in the investigation by means of dynamic shadowgraphy of the non-equilibrium fluctuations arising in liquid mixtures under non-stationary conditions, such as those arising after the imposition or removal of a thermal stress, where experiments show systematically the presence of a spurious contribution in the reconstructed structure function of the fluctuations, which depends quadratically from the time delay. We clarify the mechanisms responsible for this artifact, showing that it is caused by the imperfect alignment of the sample cell with respect to gravity, which couples the temporal evolution of the concentration profile within the sample with the optical signal collected by the shadowgraph diagnostics. We propose a data analysis protocol that enables disentangling the spurious contributions and the genuine dynamics of the fluctuations, which can be thus reliably reconstructed.
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Affiliation(s)
- Stefano Castellini
- Dipartimento di Fisica"A. Pontremoli", Università degli Studi di Milano, Milan, Italy
| | - Matteo Brizioli
- Dipartimento di Biotecnologie Mediche e Medicina Traslazionale, Università degli Studi di Milano, Segrate, Italy
| | - Cédric Giraudet
- LFCR UMR5150, E2S UPPA, CNRS, Universite de Pau et des Pays de l'Adour, Anglet, France
| | - Marina Carpineti
- Dipartimento di Fisica"A. Pontremoli", Università degli Studi di Milano, Milan, Italy
| | - Fabrizio Croccolo
- LFCR UMR5150, E2S UPPA, CNRS, Universite de Pau et des Pays de l'Adour, Anglet, France
| | - Fabio Giavazzi
- Dipartimento di Biotecnologie Mediche e Medicina Traslazionale, Università degli Studi di Milano, Segrate, Italy.
| | - Alberto Vailati
- Dipartimento di Fisica"A. Pontremoli", Università degli Studi di Milano, Milan, Italy
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2
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Peng Y, Qiu J, Peng L, Luo K, Liu D, Han P. Criterion to determine the wave vector range of heterodyne near-field exposure time-dependent spectrum. APPLIED OPTICS 2022; 61:4711-4718. [PMID: 36255950 DOI: 10.1364/ao.452850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Accepted: 04/26/2022] [Indexed: 06/16/2023]
Abstract
Recently, image methods for measuring dynamics of nanoparticles have garnered attention; however, the low-speed frame rate of normal image sensors limits their application. Applying a low-speed detector can extract fast dynamic information by the method of an exposure time-dependent spectrum, whereas its accuracy is too sensitive to the wave vector range selection. In this paper, we present a criterion to determine the wave vector range for the image method of heterodyne near-field light scattering, where the hologram of the particles is analyzed to extract the particle dynamics. A normalized instrument factor ratio 𝓇(q) is defined, and the accuracy of results can be guaranteed when the upper limit qup is selected at the maximum of 𝓇(qup)=1, and the lower limit qlow is selected according to the optimal goodness of fit R2. The experimental results verify the effectiveness of the proposed criterion. Since most image methods for nanoparticle characterizing are related to the wave vector range selection, it is believed that the idea of this criterion can be extended generally.
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García-Fernández L, Bataller H, Fruton P, Giraudet C, Vailati A, Croccolo F. Stabilized convection in a ternary mixture with two Soret coefficients of opposite sign. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2022; 45:52. [PMID: 35633426 PMCID: PMC9148296 DOI: 10.1140/epje/s10189-022-00202-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Accepted: 04/27/2022] [Indexed: 06/15/2023]
Abstract
We performed ground-based experiments on the sample polystyrene-toluene-cyclohexane in order to complement the experimental activities in microgravity conditions related to the ESA projects DCMIX4 and Giant Fluctuations. After applying a stabilizing thermal gradient by heating from above a layer of the fluid mixture, we studied over many hours the density variations in the bidimensional horizontal field by means of a Shadowgraph optical setup. The resulting images evidence the appearance of convective instability after a diffusive time associated with the binary molecular solvent consisting of toluene and cyclohexane, confirming the negative sign of the Soret coefficient of this mixture. After a larger diffusive time related to mass diffusion of the polystyrene in the binary solvent, convection was suppressed by the increasing stabilizing density gradient originated by the Soret-induced concentration gradient of the polymer. This is compatible with a positive sign of the Soret coefficient of the polymer in the binary solvent.
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Affiliation(s)
- Loreto García-Fernández
- E2S UPPA, CNRS, TotalEnergies, LFCR UMR5150, Universite de Pau et des Pays de l’Adour, Anglet, France
- Centre National d’Études Spatiales (CNES), 2, Place Maurice Quentin, Paris, France
- Department of Structure of Matter, Thermal Physics and Electronics, Faculty of Physics, University Complutense of Madrid, Madrid, Spain
| | - Henri Bataller
- E2S UPPA, CNRS, TotalEnergies, LFCR UMR5150, Universite de Pau et des Pays de l’Adour, Anglet, France
| | - Paul Fruton
- E2S UPPA, CNRS, TotalEnergies, LFCR UMR5150, Universite de Pau et des Pays de l’Adour, Anglet, France
| | - Cédric Giraudet
- E2S UPPA, CNRS, TotalEnergies, LFCR UMR5150, Universite de Pau et des Pays de l’Adour, Anglet, France
| | - Alberto Vailati
- Dipartimento di Fisica “A. Pontremoli”, Università degli Studi di Milano, Milan, Italy
| | - Fabrizio Croccolo
- E2S UPPA, CNRS, TotalEnergies, LFCR UMR5150, Universite de Pau et des Pays de l’Adour, Anglet, France
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Ndjaka AT, García-Fernández L, Bouyou DEB, Lassin A, Azaroual M, Croccolo F, Bataller H. Mass diffusion and Soret coefficient measurements of triethylene glycol/water binary mixtures by dynamic shadowgraphy. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2022; 45:20. [PMID: 35254520 DOI: 10.1140/epje/s10189-022-00171-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Accepted: 02/08/2022] [Indexed: 06/14/2023]
Abstract
The investigation of the transport properties of binary fluid mixtures remains a topic of interest in relation to the more challenging studies of ternary mixtures. In fact, the study of the phase boundary limits of the Gibbs composition triangle can be the initial step for a more complete analysis of ternary mixtures. In this paper, we apply the dynamic shadowgraphy optical technique to study non-equilibrium fluctuations induced by the presence of a gradient of temperature and/or concentration in the triethylene glycol (TEG)/water system. These thermodiffusion and free-diffusion experiments aim at measuring the transport properties of samples of the studied system at different experimental conditions. We scan both the average temperature and the TEG concentration, which allows us investigating both positive and negative thermodiffusive behaviours. The obtained values of mass diffusion coefficient are consistent with data available in the literature in the range of temperature investigated in this study. The mass diffusion coefficient of the sample prepared at 0.7 w/w TEG concentration are characterised by shadowgraphy following the two proposed methods, exhibiting consistent results. An increase of the mass diffusion coefficient as a function of the average temperature is highlighted. On the other hand, the thermodiffusion coefficient appears to be independent of the average temperature of the sample at 0.3 w/w TEG concentration.
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Affiliation(s)
- A T Ndjaka
- E2S UPPA, CNRS, TotalEnergies, LFCR UMR 5150, Universite de Pau et des Pays de l'Adour, Anglet, France
- E2S UPPA, CNRS, TotalEnergies, LFCR UMR 5150, BRGM, F-45060, Orléans, France
| | - L García-Fernández
- Department of Structure of Matter, Thermal Physics and Electronics, Faculty of Physics, University Complutense of Madrid, Avda. Complutense s/n, 28040, Madrid, Spain
| | - D E Bouyou Bouyou
- E2S UPPA, CNRS, TotalEnergies, LFCR UMR 5150, Universite de Pau et des Pays de l'Adour, Anglet, France
| | - A Lassin
- E2S UPPA, CNRS, TotalEnergies, LFCR UMR 5150, BRGM, F-45060, Orléans, France
| | - M Azaroual
- E2S UPPA, CNRS, TotalEnergies, LFCR UMR 5150, BRGM, F-45060, Orléans, France
- CNRS, BRGM, ISTO, Univ. Orléans, UMR 7327, F-45071, Orléans, France
| | - F Croccolo
- E2S UPPA, CNRS, TotalEnergies, LFCR UMR 5150, Universite de Pau et des Pays de l'Adour, Anglet, France
| | - H Bataller
- E2S UPPA, CNRS, TotalEnergies, LFCR UMR 5150, Universite de Pau et des Pays de l'Adour, Anglet, France.
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Norouzisadeh M, Chraga M, Cerchiari G, Croccolo F. The modern structurator: increased performance for calculating the structure function. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2021; 44:146. [PMID: 34855019 PMCID: PMC8639561 DOI: 10.1140/epje/s10189-021-00146-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Accepted: 10/31/2021] [Indexed: 06/13/2023]
Abstract
The autocorrelation function is a statistical tool that is often combined with dynamic light scattering (DLS) techniques to investigate the dynamical behavior of the scattered light fluctuations in order to measure, for example, the diffusive behavior of transparent particles dispersed in a fluid. An alternative approach to the autocorrelation function for the analysis of DLS data has been proposed decades ago and consists of calculating the autocorrelation function starting from difference of the signal at different times by using the so-called structure function. The structure function approach has been proven to be more robust than the autocorrelation function method in terms of noise and drift rejection. Therefore, the structure function analysis has gained visibility, in particular in combination with imaging techniques such as dynamic shadowgraphy and differential dynamic microscopy. Here, we show how the calculation of the structure function over thousands of images, typical of such techniques, can be accelerated, with the aim of achieving real-time analysis. The acceleration is realized by taking advantage of the Wiener-Khinchin theorem, i.e., by calculating the difference of images through Fourier transform in time. The new algorithm was tested both on CPU and GPU hardware, showing that the acceleration is particularly large in the case of CPU.
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Affiliation(s)
- Mojtaba Norouzisadeh
- E2S UPPA, CNRS, TOTAL, LFCR UMR5150, Universite de Pau et des Pays de l'Adour, Anglet, France
- Institut des Sciences de la Terre d'Orléans, CNRS, Université Orléans, 1A rue de la Férollerie, 45071, Orléans, France
| | - Mohammed Chraga
- E2S UPPA, CNRS, TOTAL, LFCR UMR5150, Universite de Pau et des Pays de l'Adour, Anglet, France
| | - Giovanni Cerchiari
- Institut für Experimentalphysik, Universität Innsbruck, Technikerstrasse 25, 6020, Innsbruck, Austria.
| | - Fabrizio Croccolo
- E2S UPPA, CNRS, TOTAL, LFCR UMR5150, Universite de Pau et des Pays de l'Adour, Anglet, France
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6
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García-Fernández L, Fruton P, Bataller H, Ortiz de Zárate JM, Croccolo F. Coupled non-equilibrium fluctuations in a polymeric ternary mixture. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2019; 42:124. [PMID: 31511999 DOI: 10.1140/epje/i2019-11889-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Accepted: 08/14/2019] [Indexed: 06/10/2023]
Abstract
We investigate by dynamic shadowgraphy the non-equilibrium fluctuations at the steady state of a thermodiffusion experiment in a polymeric ternary mixture of polystyrene-toluene-n-hexane. The structure function of the refractive index reveals the existence of quite different decay times, thus requiring the analysis of a wide range of correlation times. This is related to the simultaneous presence of three distinct decay modes corresponding to (from fastest to slowest) the relaxation of temperature fluctuations, of the concentration fluctuations of the mixed solvent, and of the concentration fluctuations of the polymer in the binary solvent. An investigation of the decay times at the corresponding diffusive regimes provides a measurement of the thermal diffusivity and the two eigenvalues of the mass diffusion matrix of the ternary mixture. Similar experiments were performed in the past but here, to suppress the confinement effect and obtain a more direct comparison with the theory, a thicker sample is studied. Moreover, also a faster camera is used allowing the experimental observation of faster modes, like the propagative ones. The experimental values of the decay times are eventually compared with those predicted by different available theories. Finally, we present a more complete theoretical model to describe the non-equilibrium fluctuations in the bulk of a ternary mixture at the steady state of a thermodiffusion experiment.
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Affiliation(s)
- L García-Fernández
- Laboratoire des Fluides Complexes et leurs Réservoirs - IPRA, UMR5150, E2S-Univ Pau & Pays Adour/CNRS/Total, 1 Allée du Parc Montaury, 64600, Anglet, France.
- Centre National d'Études Spatiales (CNES), 2, Place Maurice Quentin, 75001, Paris, France.
| | - P Fruton
- Laboratoire des Fluides Complexes et leurs Réservoirs - IPRA, UMR5150, E2S-Univ Pau & Pays Adour/CNRS/Total, 1 Allée du Parc Montaury, 64600, Anglet, France
| | - H Bataller
- Laboratoire des Fluides Complexes et leurs Réservoirs - IPRA, UMR5150, E2S-Univ Pau & Pays Adour/CNRS/Total, 1 Allée du Parc Montaury, 64600, Anglet, France
| | - J M Ortiz de Zárate
- Departamento de Estructura de la Materia, Física Térmica y Electrónica, Facultad de Ciencias Físicas, Universidad Complutense de Madrid, Plaza de las Ciencias 1, 28040, Madrid, Spain
| | - F Croccolo
- Laboratoire des Fluides Complexes et leurs Réservoirs - IPRA, UMR5150, E2S-Univ Pau & Pays Adour/CNRS/Total, 1 Allée du Parc Montaury, 64600, Anglet, France
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7
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Braibanti M, Artola PA, Baaske P, Bataller H, Bazile JP, Bou-Ali MM, Cannell DS, Carpineti M, Cerbino R, Croccolo F, Diaz J, Donev A, Errarte A, Ezquerro JM, Frutos-Pastor A, Galand Q, Galliero G, Gaponenko Y, García-Fernández L, Gavaldá J, Giavazzi F, Giglio M, Giraudet C, Hoang H, Kufner E, Köhler W, Lapeira E, Laverón-Simavilla A, Legros JC, Lizarraga I, Lyubimova T, Mazzoni S, Melville N, Mialdun A, Minster O, Montel F, Molster FJ, Ortiz de Zárate JM, Rodríguez J, Rousseau B, Ruiz X, Ryzhkov II, Schraml M, Shevtsova V, Takacs CJ, Triller T, Van Vaerenbergh S, Vailati A, Verga A, Vermorel R, Vesovic V, Yasnou V, Xu S, Zapf D, Zhang K. European Space Agency experiments on thermodiffusion of fluid mixtures in space. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2019; 42:86. [PMID: 31289962 DOI: 10.1140/epje/i2019-11849-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Accepted: 06/05/2019] [Indexed: 06/09/2023]
Abstract
This paper describes the European Space Agency (ESA) experiments devoted to study thermodiffusion of fluid mixtures in microgravity environment, where sedimentation and convection do not affect the mass flow induced by the Soret effect. First, the experiments performed on binary mixtures in the IVIDIL and GRADFLEX experiments are described. Then, further experiments on ternary mixtures and complex fluids performed in DCMIX and planned to be performed in the context of the NEUF-DIX project are presented. Finally, multi-component mixtures studied in the SCCO project are detailed.
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Affiliation(s)
- M Braibanti
- European Space Agency (ESA), ESTEC, Noordwijk, The Netherlands.
| | - P -A Artola
- Laboratoire de Chimie-Physique, UMR 8000 CNRS, Université Paris-Sud, Orsay, France
| | - P Baaske
- Nanotemper Technologies GmbH, Munich, Germany
| | - H Bataller
- Laboratoire des Fluides Complexes et leurs Réservoirs - IPRA, UMR5150, E2S-Univ Pau & Pays Adour / CNRS / TOTAL, 1 Allée du Parc Montaury, 64600, Anglet, France
| | - J -P Bazile
- Laboratoire des Fluides Complexes et leurs Réservoirs - IPRA, UMR5150, E2S-Univ Pau & Pays Adour / CNRS / TOTAL, 64000, Pau, France
| | - M M Bou-Ali
- MGEP Mondragon GoiEskola Politeknikoa, Mechanical and Industrial Manufacturing Department, Mondragon, Spain
| | - D S Cannell
- Department of Physics, University of California at Santa Barbara, 93106, Santa Barbara, CA, USA
| | - M Carpineti
- Dipartimento di Fisica, Università degli Studi di Milano, I-20133, Milano, Italy
| | - R Cerbino
- Dipartimento di Biotecnologie Mediche e Medicina Traslazionale, Università degli Studi di Milano, 20090, Segrate, Italy
| | - F Croccolo
- Laboratoire des Fluides Complexes et leurs Réservoirs - IPRA, UMR5150, E2S-Univ Pau & Pays Adour / CNRS / TOTAL, 1 Allée du Parc Montaury, 64600, Anglet, France
| | - J Diaz
- Laboratoire des Fluides Complexes et leurs Réservoirs - IPRA, UMR5150, E2S-Univ Pau & Pays Adour / CNRS / TOTAL, 64000, Pau, France
| | - A Donev
- Courant Institute of Mathematical Sciences, New York University, 10012, New York, NY, USA
| | - A Errarte
- MGEP Mondragon GoiEskola Politeknikoa, Mechanical and Industrial Manufacturing Department, Mondragon, Spain
| | - J M Ezquerro
- E-USOC. ETSIAE, Universidad Politécnica de Madrid, Madrid, Spain
| | - A Frutos-Pastor
- European Space Agency (ESA), ESTEC, Noordwijk, The Netherlands
| | - Q Galand
- MRC, Université libre de Bruxelles, Av. F.D. Roosevelt, 50, CP165/62, 1050, Brussels, Belgium
| | - G Galliero
- Laboratoire des Fluides Complexes et leurs Réservoirs - IPRA, UMR5150, E2S-Univ Pau & Pays Adour / CNRS / TOTAL, 64000, Pau, France
| | - Y Gaponenko
- MRC, Université libre de Bruxelles, Av. F.D. Roosevelt, 50, CP165/62, 1050, Brussels, Belgium
| | - L García-Fernández
- Laboratoire des Fluides Complexes et leurs Réservoirs - IPRA, UMR5150, E2S-Univ Pau & Pays Adour / CNRS / TOTAL, 1 Allée du Parc Montaury, 64600, Anglet, France
- Centre National d'Etudes Spatiales (CNES), 2, Place Maurice Quentin, 75001, Paris, France
| | - J Gavaldá
- Departament de Química Física i Inòrganica, Universitat Rovira i Virgili, Tarragona, Spain
| | - F Giavazzi
- Dipartimento di Biotecnologie Mediche e Medicina Traslazionale, Università degli Studi di Milano, 20090, Segrate, Italy
| | - M Giglio
- Dipartimento di Fisica, Università degli Studi di Milano, I-20133, Milano, Italy
| | - C Giraudet
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - H Hoang
- Institute of Fundamental and Applied Sciences, Duy Tan University, 10C Tran Nhat Duat Street, District 1, 700000, Ho Chi Minh City, Vietnam
| | - E Kufner
- European Space Agency (ESA), ESTEC, Noordwijk, The Netherlands
| | - W Köhler
- Physikalisches Institut, Universität Bayreuth, D-95440, Bayreuth, Germany
| | - E Lapeira
- MGEP Mondragon GoiEskola Politeknikoa, Mechanical and Industrial Manufacturing Department, Mondragon, Spain
| | | | - J -C Legros
- MRC, Université libre de Bruxelles, Av. F.D. Roosevelt, 50, CP165/62, 1050, Brussels, Belgium
| | - I Lizarraga
- MGEP Mondragon GoiEskola Politeknikoa, Mechanical and Industrial Manufacturing Department, Mondragon, Spain
| | - T Lyubimova
- Institute of Continuous Media Mechanics UB RAS, 614013, Perm, Russia
| | - S Mazzoni
- European Space Agency (ESA), ESTEC, Noordwijk, The Netherlands
- Dipartimento di Fisica, Università degli Studi di Milano, I-20133, Milano, Italy
| | - N Melville
- European Space Agency (ESA), ESTEC, Noordwijk, The Netherlands
| | - A Mialdun
- MRC, Université libre de Bruxelles, Av. F.D. Roosevelt, 50, CP165/62, 1050, Brussels, Belgium
| | - O Minster
- European Space Agency (ESA), ESTEC, Noordwijk, The Netherlands
| | - F Montel
- Laboratoire des Fluides Complexes et leurs Réservoirs - IPRA, UMR5150, E2S-Univ Pau & Pays Adour / CNRS / TOTAL, 64000, Pau, France
| | - F J Molster
- European Space Agency (ESA), ESTEC, Noordwijk, The Netherlands
| | - J M Ortiz de Zárate
- Departamento de Estructura de la Materia, Facultad de Fisica, Universidad Complutense, Plaza de las Ciencias 1, 28040, Madrid, Spain
| | - J Rodríguez
- E-USOC. ETSIAE, Universidad Politécnica de Madrid, Madrid, Spain
| | - B Rousseau
- Laboratoire de Chimie-Physique, UMR 8000 CNRS, Université Paris-Sud, Orsay, France
| | - X Ruiz
- Centre National d'Etudes Spatiales (CNES), 2, Place Maurice Quentin, 75001, Paris, France
| | - I I Ryzhkov
- Institute of Computational Modelling SB RAS, 660036, Akademgorodok, Krasnoyarsk, Russia
| | - M Schraml
- Physikalisches Institut, Universität Bayreuth, D-95440, Bayreuth, Germany
| | - V Shevtsova
- MRC, Université libre de Bruxelles, Av. F.D. Roosevelt, 50, CP165/62, 1050, Brussels, Belgium
| | - C J Takacs
- Department of Physics, University of California at Santa Barbara, 93106, Santa Barbara, CA, USA
| | - T Triller
- Physikalisches Institut, Universität Bayreuth, D-95440, Bayreuth, Germany
| | - S Van Vaerenbergh
- MRC, Université libre de Bruxelles, Av. F.D. Roosevelt, 50, CP165/62, 1050, Brussels, Belgium
| | - A Vailati
- Dipartimento di Fisica, Università degli Studi di Milano, I-20133, Milano, Italy
| | - A Verga
- European Space Agency (ESA), ESTEC, Noordwijk, The Netherlands
| | - R Vermorel
- Laboratoire des Fluides Complexes et leurs Réservoirs - IPRA, UMR5150, E2S-Univ Pau & Pays Adour / CNRS / TOTAL, 64000, Pau, France
| | - V Vesovic
- Department of Earth Science and Engineering, Imperial College London, London, UK
| | - V Yasnou
- MRC, Université libre de Bruxelles, Av. F.D. Roosevelt, 50, CP165/62, 1050, Brussels, Belgium
| | - S Xu
- Key Laboratory of Microgravity, Institute of Mechanics, Chinese Academy of Science, Beijing, China
| | - D Zapf
- Physikalisches Institut, Universität Bayreuth, D-95440, Bayreuth, Germany
| | - K Zhang
- State Key Laboratory of Enhanced Oil Recovery (Research Institute of Petroleum Exploration & Development), CNPC, Beijing, China
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8
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Brogioli D, Croccolo F, Vailati A. Asymmetric time-cross-correlation of nonequilibrium concentration fluctuations in a ternary liquid mixture. Phys Rev E 2019; 99:053115. [PMID: 31212452 DOI: 10.1103/physreve.99.053115] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Indexed: 11/07/2022]
Abstract
Equilibrium phenomena are characterized by time symmetry. Thermodynamic fluctuations are also time-symmetric at equilibrium. Conversely, diffusion of a solute in a liquid in the presence of a gradient is a nonequilibrium phenomenon, which gives rise to long-range fluctuations with amplitude much larger than the equilibrium one for small enough wave number. In the case of diffusion in binary mixtures such fluctuations are time-symmetric, notwithstanding the fact that they are generated by a nonequilibrium condition. In this paper, we investigate diffusion of two solutes in a ternary liquid mixture by means of fluctuating hydrodynamics theory. We show that the time-cross-correlation function of the concentrations is not time-symmetric, hence showing that time symmetry is violated for such nonequilibrium fluctuations. We discuss the feasibility of experiments aimed at the detection of the asymmetry of the cross-correlation function of nonequilibrium concentration fluctuations in ternary mixtures, as envisaged in the Giant Fluctuations (NEUF-DIX) microgravity project of the European Space Agency.
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Affiliation(s)
- Doriano Brogioli
- Universität Bremen, Energiespeicher- und Energiewandlersysteme, Bibliothekstraße 1, 28359 Bremen, Germany
| | - Fabrizio Croccolo
- Laboratoire des Fluides Complexes et leurs Réservoirs (LFCR), IPRA, UMR5150 E2S-Univ Pau & Pays Adour, CNRS, TOTAL, 64600 Anglet, France
| | - Alberto Vailati
- Dipartimento di Fisica, Università degli Studi di Milano, I-20133, Milano, Italy
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9
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Carpineti M, Sabato M, Croccolo F, Vailati A. Kinetics of growth of non-equilibrium fluctuations during thermodiffusion in a polymer solution. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2019; 42:25. [PMID: 30798392 DOI: 10.1140/epje/i2019-11786-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Accepted: 01/24/2019] [Indexed: 06/09/2023]
Abstract
A thermal diffusion process occurring in a binary liquid mixture is accompanied by long ranged non-equilibrium concentration fluctuations. The amplitude of these fluctuations at large length scales can be orders of magnitude larger than that of equilibrium ones. So far non-equilibrium fluctuations have been mainly investigated under stationary or quasi-stationary conditions, a situation that allows to achieve a detailed statistical characterization of their static and dynamic properties. In this work we investigate the kinetics of growth of non-equilibrium concentration fluctuations during a transient thermodiffusion process, starting from a configuration where the concentration of the sample is uniform. The use of a large molecular weight polymer solution allows to attain a slow dynamics of growth of the macroscopic concentration profile. We focus on the development of fluctuations at small wave vectors, where their amplitude is strongly limited by the presence of gravity. We show that the growth rate of non-equilibrium fluctuations follows a power law [Formula: see text] as a function of time, without any typical time scale and independently of the wave vector. We formulate a phenomenological model that allows to relate the rate of growth of non-equilibrium fluctuations to the growth of the macroscopic concentration profile in the absence of arbitrary parameters.
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Affiliation(s)
- Marina Carpineti
- Dipartimento di Fisica, Università degli Studi di Milano, I-20133, Milano, Italy.
| | - Matteo Sabato
- Dipartimento di Fisica, Università degli Studi di Milano, I-20133, Milano, Italy
| | - Fabrizio Croccolo
- Laboratoire des Fluides Complexes et leurs Réservoirs, IPRA, UMR5150 E2S-Université de Pau et des Pays de l'Adour, CNRS, TOTAL, F-64600, Anglet, France
| | - Alberto Vailati
- Dipartimento di Fisica, Università degli Studi di Milano, I-20133, Milano, Italy
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Croccolo F, García-Fernández L, Bataller H, Vailati A, Ortiz de Zárate JM. Propagating modes in a binary liquid mixture under thermal stress. Phys Rev E 2019; 99:012602. [PMID: 30780374 DOI: 10.1103/physreve.99.012602] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Indexed: 11/07/2022]
Abstract
Nonequilibrium temperature and concentration fluctuations inside a binary liquid mixture under the action of a temperature gradient relax back to equilibrium either due to conduction and diffusion at large wave numbers, or due to the quenching determined by gravity at small wave numbers. We investigate the dynamics of nonequilibrium fluctuations in a binary liquid mixture of polystyrene and toluene heated from above under stationary conditions in a thermodiffusion experiment. We show that the strong gravitational stabilization at small wave numbers determines the appearance of propagating modes of nonequilibrium fluctuations as detected through the structure function of shadowgraph images. The propagating modes are the combined effect of temperature and velocity nonequilibrium fluctuations induced by the buoyancy force. The experimental results are in good agreement with a fluctuating hydrodynamics theroretical model including the coupling of fluctuations of velocity, temperature and concentration.
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Affiliation(s)
- Fabrizio Croccolo
- Laboratoire des Fluides Complexes et leurs Réservoirs, IPRA, UMR5150, E2S-Univ Pau & Pays Adour/CNRS/Total, 64600 Anglet, France
| | - Loreto García-Fernández
- Laboratoire des Fluides Complexes et leurs Réservoirs, IPRA, UMR5150, E2S-Univ Pau & Pays Adour/CNRS/Total, 64600 Anglet, France
| | - Henri Bataller
- Laboratoire des Fluides Complexes et leurs Réservoirs, IPRA, UMR5150, E2S-Univ Pau & Pays Adour/CNRS/Total, 64600 Anglet, France
| | - Alberto Vailati
- Universitá degli Studi di Milano, Via Celoria 13, 20013 Milano, Italy
| | - José María Ortiz de Zárate
- Departamento de Estructura de la Materia, Física Térmica y Electrónica, Facultad de Ciencias Físicas, Universidad Complutense de Madrid, 28040 Madrid, Spain
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Bataller H, Triller T, Pur B, Köhler W, Ortiz de Zárate JM, Croccolo F. Dynamic analysis of the light scattered by the non-equilibrium fluctuations of a ternary mixture of polystyrene-toluene-n-hexane. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2017; 40:35. [PMID: 28352991 DOI: 10.1140/epje/i2017-11522-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Accepted: 03/01/2017] [Indexed: 06/06/2023]
Abstract
Dynamic analysis of the light scattered by non-equilibrium fluctuations in a thermodiffusion experiment has been performed on a sample of polystyrene-toluene-n -hexane, at 0.9-49.55-49.55% mass fraction. Time decays of the non-equilibrium fluctuations have been obtained revealing the accurate detectability of three modes. The slowest mode has been attributed to the mass diffusion of the polymer into the binary solvent; the intermediate one to mass diffusion of the two molecular components of the solvent; finally, the fastest one has been attributed to the thermal diffusivity of the overall mixture. The two eigenvalues of the mass diffusion matrix have been evaluated with accuracy in the order of 1%. Neglecting cross-diffusion effects we obtain a simplified expression for the relative amplitude of the two mass diffusion modes, allowing a parameterized determination of polystyrene and toluene Soret coefficients in the ternary mixture. We suggest that a two wavelength shadowgraph experiment is needed for a complete determination of all the coefficients.
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Affiliation(s)
- Henri Bataller
- Univ Pau & Pays Adour, CNRS, TOTAL, LFCR-IPRA, UMR5150, 1 Allée du Parc Montaury, 64600, Anglet, France.
| | - Thomas Triller
- Physikalisches Institut, Universität Bayreuth, D-95440, Bayreuth, Germany
| | - Bastian Pur
- Physikalisches Institut, Universität Bayreuth, D-95440, Bayreuth, Germany
| | - Werner Köhler
- Physikalisches Institut, Universität Bayreuth, D-95440, Bayreuth, Germany
| | | | - Fabrizio Croccolo
- Univ Pau & Pays Adour, CNRS, TOTAL, LFCR-IPRA, UMR5150, 1 Allée du Parc Montaury, 64600, Anglet, France
- Centre National d'Etudes Spatiales (CNES), 2, Place Maurice Quentin, 75001, Paris, France
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Lizarraga I, Croccolo F, Bataller H, Mounir Bou-Ali M. Soret coefficient of the n-dodecane-n-hexane binary mixture under high pressure. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2017; 40:36. [PMID: 28361186 DOI: 10.1140/epje/i2017-11520-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Accepted: 02/27/2017] [Indexed: 06/07/2023]
Abstract
In the present work, the Soret coefficient has been determined at high pressure for a binary hydrocarbon mixture by combining the thermogravitational column and the dynamic near-field imaging techniques. The analyzed mixture is an iso-massic n -dodecane-n -hexane mixture at 298.15K. The molecular diffusion coefficient has been measured up to 20MPa by means of the dynamic analysis of the light scattered by non-equilibrium concentration fluctuations. With a cylindrical thermogravitational column the thermodiffusion coefficient was determined from 0.1MPa to 10MPa. Density, as well as, mass expansion and thermal expansion have been measured with a high pressure densimeter. Dynamic viscosity at up to 20MPa has been determined with a high pressure viscometer. This work shows the decreasing tendency of both the molecular diffusion and the thermodiffusion coefficient with increasing pressure.
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Affiliation(s)
- Ion Lizarraga
- MGEP Mondragon Goi Eskola Politeknikoa, Mechanical and Industrial Manufacturing Department, Loramendi 4, Apartado 23, 20500, Mondragon, Spain
| | - Fabrizio Croccolo
- Univ. Pau & Pays Adour, CNRS, TOTAL, LFCR-IPRA, UMR5150, 1 allée du Parc Montaury, 64600, Anglet, France
- CNES Centre National d'Études Spatiales, 2 place Maurice Quentin, 75 039, Paris Cedex 01, France
| | - Henri Bataller
- Univ. Pau & Pays Adour, CNRS, TOTAL, LFCR-IPRA, UMR5150, 1 allée du Parc Montaury, 64600, Anglet, France
| | - M Mounir Bou-Ali
- MGEP Mondragon Goi Eskola Politeknikoa, Mechanical and Industrial Manufacturing Department, Loramendi 4, Apartado 23, 20500, Mondragon, Spain.
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Oprisan A, Rice A, Oprisan SA, Giraudet C, Croccolo F. Non-equilibrium concentration fluctuations in superparamagnetic nanocolloids. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2017; 40:14. [PMID: 28181056 DOI: 10.1140/epje/i2017-11503-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2016] [Accepted: 01/11/2017] [Indexed: 06/06/2023]
Abstract
We investigate non-equilibrium concentration fluctuations during the free diffusion of a colloidal suspension against pure water. We investigate Fe2O3 superparamagnetic nanocolloids with sizes between 1 and 10 nm by means of a shadowgraph apparatus to determine the mixture mass diffusion coefficient and kinematic viscosity. The experiments were performed in three distinct conditions: Experiment 1 is without any magnetic field; Experiment 2 with a vertical magnetic field; Experiment 3 after turning off the magnetic field. We found no correlation between the kinematic viscosity coefficient and the external magnetic field. Conversely, we found that the mass diffusion coefficient decreases in the presence of the external magnetic field and slowly rebounds after the magnetic field was turned off.
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Affiliation(s)
- Ana Oprisan
- College of Charleston, Department of Physics and Astronomy, Charleston, SC, USA.
| | - Ashley Rice
- College of Charleston, Department of Physics and Astronomy, Charleston, SC, USA
| | - Sorinel A Oprisan
- College of Charleston, Department of Physics and Astronomy, Charleston, SC, USA
| | - Cédric Giraudet
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), University of Erlangen-Nuremberg, Erlangen, Germany
| | - Fabrizio Croccolo
- Laboratoire des Fluides Complexes et leurs Réservoirs - UMR5150, Université de Pau et des Pays de l'Adour, Anglet, France
- Centre Nationale d'Etudes Spatiales (CNES), Paris, France
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Giraudet C, Bataller H, Sun Y, Donev A, Ortiz de Zárate JM, Croccolo F. Confinement effect on the dynamics of non-equilibrium concentration fluctuations far from the onset of convection. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2016; 39:120. [PMID: 28012142 DOI: 10.1140/epje/i2016-16120-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Accepted: 11/18/2016] [Indexed: 06/06/2023]
Abstract
In a recent letter (C. Giraudet et al., EPL 111, 60013 (2015)) we reported preliminary data showing evidence of a slowing-down of non-equilibrium fluctuations of the concentration in thermodiffusion experiments on a binary mixture of miscible fluids. The reason for this slowing-down was attributed to the effect of confinement. Such tentative explanation is here experimentally corroborated by new measurements and theoretically substantiated by studying analytically and numerically the relevant fluctuating hydrodynamics equations. In the new experiments presented here, the magnitude of the temperature gradient is changed, confirming that the system is controlled solely by the solutal Rayleigh number, and that the slowing-down is dominated by a combined effect of the driving force of buoyancy, the dissipating force of diffusion and the confinement provided by the vertical extension of the sample cell. Moreover, a compact phenomenological interpolating formula is proposed for easy analysis of experimental results.
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Affiliation(s)
- Cédric Giraudet
- Laboratoire des Fluides Complexes et leurs Réservoirs - UMR5150, Université de Pau et des Pays de l'Adour, 1 Allée du Parc Montaury, 64600, Anglet, France
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität, 91052, Erlangen, Germany
| | - Henri Bataller
- Laboratoire des Fluides Complexes et leurs Réservoirs - UMR5150, Université de Pau et des Pays de l'Adour, 1 Allée du Parc Montaury, 64600, Anglet, France
| | - Yifei Sun
- Courant Institute of Mathematical Sciences, New York University, 10012, New York, NY, USA
| | - Aleksandar Donev
- Courant Institute of Mathematical Sciences, New York University, 10012, New York, NY, USA
| | - José M Ortiz de Zárate
- Departamento de Fısica Aplicada I, Facultad de Fısica, Universidad Complutense, 28040, Madrid, Spain
| | - Fabrizio Croccolo
- Laboratoire des Fluides Complexes et leurs Réservoirs - UMR5150, Université de Pau et des Pays de l'Adour, 1 Allée du Parc Montaury, 64600, Anglet, France.
- Centre National d'Études Spatiales (CNES) 2, Place Maurice Quentin, 75001, Paris, France.
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Croccolo F, Bataller H. Microgravity in a thin film: How confinement kills gravity. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2016; 39:132. [PMID: 28012145 DOI: 10.1140/epje/i2016-16132-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Accepted: 11/30/2016] [Indexed: 06/06/2023]
Abstract
Fluctuations in the presence of concentration gradients are long-ranged and decay diffusively for small spatial scales. At larger scales fluctuations are influenced by gravity and confinement. The confinement in the direction of the concentration gradient couples to gravity generating a slowing down that ends up in a diffusion-like behavior of fluctuations of size comparable to the vertical extension of the sample. The resulting enhanced diffusion coefficient depends on the solutal Rayleigh number of the system. For small (in modulus) values of the solutal Rayleigh number the apparent diffusion coefficient tends towards the normal one and a simple diffusive behavior is obtained. This is quite similar to what happens in microgravity conditions when the solutal Rayleigh number is drastically reduced because of the reduction of g by about 6 orders of magnitude. Experiments are shown for positive and negative solutal Rayleigh numbers smaller (in modulus) than 1000. The effect of the confinement on the statics is also investigated. Comparison with microgravity data obtained through the GRADFLEX project is performed.
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Affiliation(s)
- Fabrizio Croccolo
- Laboratoire des Fluides Complexes et leurs Réservoirs - UMR5150, Université de Pau et des Pays de l'Adour, 1 Allée du Parc Montaury, 64600, Anglet, France.
- Centre National d'Études Spatiales (CNES) 2, Place Maurice Quentin, 75001, Paris, France.
| | - Henri Bataller
- Laboratoire des Fluides Complexes et leurs Réservoirs - UMR5150, Université de Pau et des Pays de l'Adour, 1 Allée du Parc Montaury, 64600, Anglet, France
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16
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Baaske P, Bataller H, Braibanti M, Carpineti M, Cerbino R, Croccolo F, Donev A, Köhler W, Ortiz de Zárate JM, Vailati A. The NEUF-DIX space project - Non-EquilibriUm Fluctuations during DIffusion in compleX liquids. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2016; 39:119. [PMID: 28012143 DOI: 10.1140/epje/i2016-16119-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Accepted: 11/07/2016] [Indexed: 06/06/2023]
Abstract
Diffusion and thermal diffusion processes in a liquid mixture are accompanied by long-range non-equilibrium fluctuations, whose amplitude is orders of magnitude larger than that of equilibrium fluctuations. The mean-square amplitude of the non-equilibrium fluctuations presents a scale-free power law behavior q-4 as a function of the wave vector q, but the divergence of the amplitude of the fluctuations at small wave vectors is prevented by the presence of gravity. In microgravity conditions the non-equilibrium fluctuations are fully developed and span all the available length scales up to the macroscopic size of the systems in the direction parallel to the applied gradient. Available theoretical models are based on linearized hydrodynamics and provide an adequate description of the statics and dynamics of the fluctuations in the presence of small temperature/concentration gradients and under stationary or quasi-stationary conditions. We describe a project aimed at the investigation of Non-EquilibriUm Fluctuations during DIffusion in compleX liquids (NEUF-DIX). The focus of the project is on the investigation in micro-gravity conditions of the non-equilibrium fluctuations in complex liquids, trying to tackle several challenging problems that emerged during the latest years, such as the theoretical predictions of Casimir-like forces induced by non-equilibrium fluctuations; the understanding of the non-equilibrium fluctuations in multi-component mixtures including a polymer, both in relation to the transport coefficients and to their behavior close to a glass transition; the understanding of the non-equilibrium fluctuations in concentrated colloidal suspensions, a problem closely related with the detection of Casimir forces; and the investigation of the development of fluctuations during transient diffusion. We envision to parallel these experiments with state-of-the-art multi-scale simulations.
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Affiliation(s)
| | - Henri Bataller
- Laboratoire des Fluides Complexes et leurs Réservoirs - UMR5150, Université de Pau et des Pays de l'Adour, F-64600, Anglet, France
| | | | - Marina Carpineti
- Dipartimento di Fisica, Università degli Studi di Milano, I-20133, Milano, Italy
| | - Roberto Cerbino
- Dipartimento di Biotecnologie Mediche e Medicina Traslazionale, Università degli Studi di Milano, 20090, Segrate (MI), Italy
| | - Fabrizio Croccolo
- Laboratoire des Fluides Complexes et leurs Réservoirs - UMR5150, Université de Pau et des Pays de l'Adour, F-64600, Anglet, France
- Centre Nationale d'Etudes Spatiales, Paris, France
| | - Aleksandar Donev
- Courant Institute of Mathematical Sciences, New York University, 10012, New York, NY, USA
| | - Werner Köhler
- Physikalisches Institut, Universität Bayreuth, D-95440, Bayreuth, Germany
| | | | - Alberto Vailati
- Dipartimento di Fisica, Università degli Studi di Milano, I-20133, Milano, Italy.
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Jiang X, Cheng Q, Xu Z, Qian M, Han Q. Quantitative measurement of acoustic pressure in the focal zone of acoustic lens-line focusing using the Schlieren method. APPLIED OPTICS 2016; 55:2478-2483. [PMID: 27139646 DOI: 10.1364/ao.55.002478] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This paper proposes a theory and method for quantitative measurement of the acoustic lens-line focusing ultrasonic (ALLFU) field in its focal spot size and acoustic pressure using the Schlieren imaging technique. Using Fourier transformation, the relationship between the brightness of the Schlieren image and the acoustic pressure was introduced. The ALLFU field was simulated using finite element method and compared with the Schlieren acoustic field image. The measurement of the focal spot size was performed using the Schlieren method. The acoustic pressure in the focal zone of the ALLFU field and the transducer-transmitting voltage response were quantitatively determined by measuring the diffraction light fringe intensity. The results show that the brightness of the Schlieren image is a linear function of the acoustic intensity when the acousto-optic interaction length remains constant and the acoustic field is weak.
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Croccolo F, Bataller H, Scheffold F. Static versus dynamic analysis of the influence of gravity on concentration non-equilibrium fluctuations. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2014; 37:105. [PMID: 25374309 DOI: 10.1140/epje/i2014-14105-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2014] [Revised: 09/02/2014] [Accepted: 10/14/2014] [Indexed: 06/04/2023]
Abstract
In a binary fluid mixture subject to gravity and a stabilizing concentration gradient, concentration non-equilibrium fluctuations are long-ranged. While the gradient leads to an enhancement of the respective equilibrium fluctuations, the effect of gravity is a damping of fluctuations larger than a "characteristic" size. This damping is visible both in the fluctuation power spectrum probed by static and the temporal correlation function probed by dynamic light scattering. One aspect of the "characteristic" size can be appreciated by the dynamic analysis; in fact at the corresponding "characteristic" wave vector q* one can observe a maximum of the fluctuation time constant indicating the more persistent fluctuation of the system. Also in the static analysis a "characteristic" size can be extracted from the crossover wave vector. According to common theoretical concepts, the result should be the same in both cases. In the present work we provide evidence for a systematic difference in the experimentally observed "characteristic" size as obtained by static and dynamic measurements. Our observation thus points out the need for a more refined theory of non-equilibrium concentration fluctuations.
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Affiliation(s)
- Fabrizio Croccolo
- Laboratoire des Fluides Complexes et leurs Réservoirs - UMR5150, Université de Pau et des Pays de l'Adour, 64600, Anglet, France,
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Giraudet C, Bataller H, Croccolo F. High-pressure mass transport properties measured by dynamic near-field scattering of non-equilibrium fluctuations. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2014; 37:107. [PMID: 25403832 DOI: 10.1140/epje/i2014-14107-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Revised: 10/21/2014] [Accepted: 10/22/2014] [Indexed: 06/04/2023]
Abstract
High-pressure mass diffusion and Soret coefficients of the equimassic 1,2,3,4-tetrahydronaphthalene and n-dodecane binary mixture are obtained from dynamic light scattering analysis of concentration non-equilibrium fluctuations at the steady state of Soret-driven separation. A high-pressure shadowgraph set-up has been developed to investigate thermodiffusion in free medium from atmospheric pressure up to 20 MPa. Results at atmospheric pressure show excellent agreement with benchmark values. High-pressure results for the mass diffusion coefficient confirm theoretical predictions by Leffler-Cullinan relation. Further calculation of the thermodiffusion coefficient allows also comparison with previous experimental results with, again, very good agreement.
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Affiliation(s)
- C Giraudet
- Laboratoire des Fluides Complexes et leurs Réservoirs, UMR 5150, Université de Pau et des Pays de l'Adour, 64600, Anglet, France
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Italia M, Croccolo F, Scheffold F, Vailati A. Inclined layer convection in a colloidal suspension with negative Soret coefficient at large solutal Rayleigh numbers. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2014; 37:101. [PMID: 25348665 DOI: 10.1140/epje/i2014-14101-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2014] [Revised: 10/02/2014] [Accepted: 10/08/2014] [Indexed: 06/04/2023]
Abstract
Convection in an inclined layer of fluid is affected by the presence of a component of the acceleration of gravity perpendicular to the density gradient that drives the convective motion. In this work we investigate the solutal convection of a colloidal suspension characterized by a negative Soret coefficient. Convection is induced by heating the suspension from above, and at large solutal Rayleigh numbers (of the order of 10(7)-10(8)) convective spoke patterns form. We show that in the presence of a marginal inclination of the cell as small as 19 mrad the isotropy of the spoke pattern is broken and the convective patterns tend to align in the direction of the inclination. At intermediate inclinations of the order of 33 mrad ordered square patterns are obtained, while at inclination of the order of 67 mrad the strong shear flow determined by the inclination gives rise to ascending and descending sheets of fluid aligned parallel to the direction of inclination.
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Affiliation(s)
- Matteo Italia
- Dipartimento di Fisica, Università degli Studi di Milano, I-20133, Milano, Italy
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Croccolo F, Scheffold F, Vailati A. Effect of a marginal inclination on pattern formation in a binary liquid mixture under thermal stress. PHYSICAL REVIEW LETTERS 2013; 111:014502. [PMID: 23863004 DOI: 10.1103/physrevlett.111.014502] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2013] [Indexed: 06/02/2023]
Abstract
Convective motions in a fluid layer are affected by its orientation with respect to the gravitational field. We investigate the long-term stability of a thermally stressed layer of a binary liquid mixture and show that pattern formation is strongly affected by marginal inclinations as small as a few milliradians. At small Rayleigh numbers, the mass transfer is dominated by the induced large scale shear flow, while at larger Rayleigh numbers, it is dominated by solutal convection. At the transition, the balance between the solutal and shear flows gives rise to drifting columnar flows moving in opposite directions along parallel lanes in a superhighway configuration.
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Affiliation(s)
- Fabrizio Croccolo
- Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland.
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Croccolo F, Bataller H, Scheffold F. A light scattering study of non equilibrium fluctuations in liquid mixtures to measure the Soret and mass diffusion coefficient. J Chem Phys 2013; 137:234202. [PMID: 23267479 DOI: 10.1063/1.4771872] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We use dynamic near field scattering to measure the dynamics of concentration non equilibrium fluctuations at the steady-state of Soret separation. The analysis reveals that above a threshold wave vector q(c), the dynamics is governed by diffusion while at smaller wave vectors, gravity dominates. From the measurements, we extract both the mass diffusion and the Soret coefficients. Comparing our results with literature data, we find good agreement confirming that the proposed experimental technique can be considered a sound approach for the study of thermodiffusion processes.
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Affiliation(s)
- F Croccolo
- Department of Physics, University of Fribourg, Ch. du Musée 3, CH-1700 Fribourg, Switzerland.
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Cerchiari G, Croccolo F, Cardinaux F, Scheffold F. Note: Quasi-real-time analysis of dynamic near field scattering data using a graphics processing unit. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2012; 83:106101. [PMID: 23126815 DOI: 10.1063/1.4755747] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2012] [Accepted: 09/12/2012] [Indexed: 06/01/2023]
Abstract
We present an implementation of the analysis of dynamic near field scattering (NFS) data using a graphics processing unit. We introduce an optimized data management scheme thereby limiting the number of operations required. Overall, we reduce the processing time from hours to minutes, for typical experimental conditions. Previously the limiting step in such experiments, the processing time is now comparable to the data acquisition time. Our approach is applicable to various dynamic NFS methods, including shadowgraph, Schlieren and differential dynamic microscopy.
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Affiliation(s)
- G Cerchiari
- Department of Physics, University of Fribourg, Ch. Du Musée 3, 1700 Fribourg, Switzerland
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Croccolo F, Arnaud MA, Bégué D, Bataller H. Concentration dependent refractive index of a binary mixture at high pressure. J Chem Phys 2011; 135:034901. [DOI: 10.1063/1.3610368] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
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