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Abouelsoud M, Kherbeche A, Thoraval MJ. Drop impact on a mesh - Viscosity effect. J Colloid Interface Sci 2023; 648:37-45. [PMID: 37295368 DOI: 10.1016/j.jcis.2023.04.099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Revised: 04/08/2023] [Accepted: 04/21/2023] [Indexed: 06/12/2023]
Abstract
Using a mesh surface is a promising technique in oil-water separation applications. In this paper, we investigated the dynamic impact of a silicone oil drop with different viscosities on an oleophilic mesh experimentally, which will help to define the critical conditions of the oil-water separation process. Four impact regimes were observed by controlling the impact velocity: deposition, partial imbibition, pinch-off, and separation. Thresholds of deposition, partial imbibition, and separation regimes were estimated, by balancing the inertia, capillary, and viscous forces. During the deposition and partial imbibition phenomena, the maximum spreading ratio (βmax) increases with the Weber number. In contrast, in the case of the separation phenomenon, no significant effect of the Weber number on βmax has been observed. Based on energy balance, we predicted the maximum elongation length of the liquid under the mesh during the partial imbibition phenomenon; the predicted data agrees well with the experimental data.
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Affiliation(s)
- Mostafa Abouelsoud
- State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi Key Laboratory of Environment and Control for Flight Vehicle, International Center for Applied Mechanics, School of Aerospace, Xi'an Jiaotong University, Xi'an 710049, PR China; Department of Mechanical Engineering, Faculty of Engineering, South Valley University, Qena 83523, Egypt.
| | - Abderrahmane Kherbeche
- Gustave Eiffel University, Geomaterials and Environment Laboratory (EA 4508), UPEM, 77454 Marne-la-Vallee, France
| | - Marie-Jean Thoraval
- State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi Key Laboratory of Environment and Control for Flight Vehicle, International Center for Applied Mechanics, School of Aerospace, Xi'an Jiaotong University, Xi'an 710049, PR China
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van der Ven DL, Morrone D, Quetzeri-Santiago MA, Fernandez Rivas D. Microfluidic jet impact: Spreading, splashing, soft substrate deformation and injection. J Colloid Interface Sci 2023; 636:549-558. [PMID: 36652830 DOI: 10.1016/j.jcis.2023.01.024] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 01/03/2023] [Accepted: 01/05/2023] [Indexed: 01/11/2023]
Abstract
HYPOTHESIS Needle-free injections using microfluidic jets could be optimized by reducing splashing and controlling injection depth. However, this is impeded by an incomplete understanding on how jet characteristics influence impact outcome. We hypothesise that exploring the relation between microfluidic jet characteristics and substrate shear modulus on impact behavior will assist in predicting and giving insights on the impact outcome on skin and injection endpoints. EXPERIMENTS To do so, a setup using microfluidic chips, at varying laser powers and stand-off distances, was used to create thermocavitation generated microfluidic jets with ranging characteristics (velocity: 7-77 m/s, diameter: 35-120 μm, Weber-number: 40-4000), which were impacted on substrates with different shear modulus. FINDINGS Seven impact regimes were found, depending on jet Weber-number and substrate shear modulus, and we identified three thresholds: i) spreading/splashing threshold, ii) dimple formation threshold, and iii) plastic/elastic deformation threshold. The regimes show similarity to skin impact, although the opacity of skin complicated determining the threshold values. Additionally, we found that jet velocity has a higher predictive value for injection depth compared to the Weber-number, and consequently, the jet-diameter. Our findings provide fundamental knowledge on the interaction between microfluidic jets and substrates, and are relevant for optimizing needle-free injections.
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Affiliation(s)
- Diana L van der Ven
- Mesoscale Chemical Systems group, MESA+ Institute and Faculty of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, the Netherlands
| | - Davide Morrone
- Nanovea SRL, Via Balegno 1, 10040 Rivalta di Torino, Italy
| | - Miguel A Quetzeri-Santiago
- Mesoscale Chemical Systems group, MESA+ Institute and Faculty of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, the Netherlands.
| | - David Fernandez Rivas
- Mesoscale Chemical Systems group, MESA+ Institute and Faculty of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, the Netherlands.
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Gajevic Joksimovic M, Schmidt JB, Roisman IV, Tropea C, Hussong J. Impact of a suspension drop onto a hot substrate: diminution of splash and prevention of film boiling. SOFT MATTER 2023; 19:1440-1453. [PMID: 36723248 DOI: 10.1039/d2sm01038k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
In the present study, the effect of graphite lubricant additives on the dynamics of a single drop impact onto a heated surface has been investigated in the nucleate boiling and thermal atomization regimes. In the nucleate boiling regime the drop impact is accompanied by the nucleation and expansion of multiple vapor bubbles. The drop residence time at the substrate is determined by the time of its mass loss due to splash and evaporation. At higher temperatures, above the Leidenfrost point, impact may lead to drop rebound. In this experimental and theoretical study the effect of additives on the outcome of drop impact, in particular, the addition of solid graphite particles, is investigated. The residence time of the drop has been measured for various initial drop temperatures and suspension concentrations. The addition of the particles leads to some increase of the residence time, while its dependence on the substrate temperature follows the scaling relation obtained in the theory. Moreover, the presence of the particles in the drop leads to suppression of splash and a significant increase of the drop rebound temperature, which is often associated with the Leidenfrost point. These effects are caused by the properties of the deposited layer, and pinning of the contact line of the entire drop and of each vapor bubble, preventing bubble coalescence and drop rebound. The phenomena are also explained by a significant increase of the liquid viscosity caused by the evaporation of the bulk liquid at high wall temperatures.
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Affiliation(s)
- Marija Gajevic Joksimovic
- Institute for Fluid Mechanics and Aerodynamics, Technische Universität Darmstadt, Darmstadt, Germany.
| | - J Benedikt Schmidt
- Institute for Fluid Mechanics and Aerodynamics, Technische Universität Darmstadt, Darmstadt, Germany.
| | - Ilia V Roisman
- Institute for Fluid Mechanics and Aerodynamics, Technische Universität Darmstadt, Darmstadt, Germany.
| | - Cameron Tropea
- Institute for Fluid Mechanics and Aerodynamics, Technische Universität Darmstadt, Darmstadt, Germany.
| | - Jeanette Hussong
- Institute for Fluid Mechanics and Aerodynamics, Technische Universität Darmstadt, Darmstadt, Germany.
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Aksoy Y, Liu L, Abboud M, Vetrano MR, Koos E. Role of Nanoparticles in Nanofluid Droplet Impact on Solid Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:12-19. [PMID: 36548220 PMCID: PMC9835883 DOI: 10.1021/acs.langmuir.2c02578] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Indexed: 06/17/2023]
Abstract
Splashing of a liquid droplet onto a substrate, while ubiquitous, sits at the intersection of several key fluid mechanical regions. Typically, this problem is often simplified to the transition between spreading and splashing, even for splashing on complex surfaces. Recently, there has been increased interest in using not just pure liquids but also nanofluids in applications such as spray cooling. While the addition of a few percent of nanoparticles to a Newtonian fluid does not change its apparent viscosity, the influence of the nanoparticles on the splashing transition is pronounced. We often view splashing in terms of fluid mechanics where a simple material is subjected to a complex flow and the fluid can be simply characterized by a Newtonian viscosity. For nanofluids, we have an apparently simple material in a complex flow, but the results show that the impact of the particles is nontrivial. This implies that we must now combine some of the insights we obtain from studying the rheological properties of nanosuspensions with this already complex problem.
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Affiliation(s)
- Yunus
Tansu Aksoy
- Department
of Mechanical Engineering, Division of Applied Mechanics and Energy
Conversion, KU Leuven, 3001Leuven, Belgium
| | - Lingyue Liu
- Department
of Chemical Engineering, Division of Soft Matter, Rheology and Technology, KU Leuven, 3001Leuven, Belgium
| | - Mohammad Abboud
- Institute
of Fluid Mechanics and Aerodynamics, Technical
University of Darmstadt, 64347Griesheim, Germany
| | - Maria Rosaria Vetrano
- Department
of Mechanical Engineering, Division of Applied Mechanics and Energy
Conversion, KU Leuven, 3001Leuven, Belgium
| | - Erin Koos
- Department
of Chemical Engineering, Division of Soft Matter, Rheology and Technology, KU Leuven, 3001Leuven, Belgium
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Spreading-splashing transition of nanofluid droplets on a smooth flat surface. J Colloid Interface Sci 2022; 606:434-443. [PMID: 34411826 DOI: 10.1016/j.jcis.2021.07.157] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Revised: 07/30/2021] [Accepted: 07/31/2021] [Indexed: 11/20/2022]
Abstract
HYPOTHESIS Even a small fraction of nanoparticles in fluids affects the splashing behavior of a droplet upon impact on a smooth surface. EXPERIMENTS Nanofluid drop impact onto a smooth sapphire substrate is experimentally investigated over wide ranges of Reynolds (102<Re<104) and Weber (50<We<500) numbers for three nanofluid mass concentrations (0.01%, 0.1%, 1%) using high-speed photography. Nanofluids are prepared by diluting a commercial Al2O3-water nanofluid in aqueous glycerol solutions without dispersants. In total, 30 samples are prepared and 1799 data points are acquired. Every sample is experimentally characterized prior to droplet impact measurements in terms of stability, density, viscosity, and surface tension to demonstrate the observed outcomes on the We-Re maps. Each droplet impact condition is repeated at least 3 times to ensure good repeatability. FINDINGS The non-monotonic behavior of the spreading-to-splashing transition remains the same for nanofluids. However, nanofluids influence this boundary by promoting splashing at low Reynolds numbers. We explain this behavior by increased lamella spreading speed and lift during the lamella spreading stage. Finally, we develop an empirical correlation which describes the splashing threshold dependency on nanoparticle concentration for the first time.
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Yang L, Li Z, Yang T, Chi Y, Zhang P. Experimental Study on Droplet Splash and Receding Breakup on a Smooth Surface at Atmospheric Pressure. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:10838-10848. [PMID: 34469690 DOI: 10.1021/acs.langmuir.1c01797] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Droplet impact on a smooth solid surface at atmospheric pressure was experimentally studied and physically interpreted. A particular emphasis of the study is on the effects of liquid viscosity on the transition between droplet deposition (or droplet spreading without breakup) and droplet disintegration (including droplet splash and receding breakup). Specifically, the critical Weber number separating droplet deposition from droplet disintegration decreases and then increases with increasing Ohnesorge number (Oh). The splash in the low-Oh region and the receding breakup in the high-Oh region were analyzed qualitatively based on the unbalanced forces acting on the rim of the spreading or receding liquid film. A semiempirical correlation of droplet deposition/disintegration thresholds is proposed and well fits the experimental results from previous and present studies over a wide range of liquid viscosity.
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Affiliation(s)
- Lei Yang
- College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
| | - Zhonghong Li
- College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
| | - Tao Yang
- Departmental of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon 852, Hong Kong
| | - Yicheng Chi
- Departmental of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon 852, Hong Kong
| | - Peng Zhang
- Departmental of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon 852, Hong Kong
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