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Wang W, Manas-Zloczower I, Kaufman M. Characterization of Distributive Mixing in Polymer Processing Equipment using Renyi Entropies. INT POLYM PROC 2022. [DOI: 10.1515/ipp-2001-0002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
A new method for characterization of distributive mixing in processing equipment, based on Renyi entropies, was developed. This method was applied to a twin-flight single screw extruder, in which tracer positions were determined through computer simulations of the flow field. The various entropies were calculated using particle concentrations in equal area domains of the mixer. Renyi entropies, which are function of a parameter β, were calculated for extruders of different lengths. We discuss the merit of using Renyi entropies for different values of β by pointing to the different mixing characteristics they probe. The relative Renyi entropy varies between 0 and 1 and represents a measure of distributive mixing quality, with 1 corresponding to perfect mixing and 0 corresponding to poorest mixing. We compare this new method of distributive mixing characterization to traditional ones based on the concepts of Scale and Intensity of Segregation, and the calculations based on Pairwise Correlations and Correlation Sums. The results show good agreement between the relative Renyi entropy and the traditional methods. Other advantages of the Renyi entropy such as reduced calculation time and geometric independence are discussed. For the case of a twin-flight single screw extruder, it is shown that a longer extruder is not necessarily more beneficial to distributive mixing.
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Affiliation(s)
- W. Wang
- Department of Macromolecular Science, Case Western Reserve University, Cleveland , Ohio , USA
| | - I. Manas-Zloczower
- Department of Macromolecular Science, Case Western Reserve University, Cleveland , Ohio , USA
| | - M. Kaufman
- Department of Physics, Cleveland State University, Cleveland , Ohio , USA
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Mostafaiyan M, Wießner S, Heinrich G. Study of distributive mixing in a journal bearing flow geometry. INT POLYM PROC 2022. [DOI: 10.1515/ipp-2021-4145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
We implicitly assess the distributive mixing of generalized Newtonian fluids with shear-thinning behavior in a journal bearing flow geometry. For this purpose, we firstly develop a finite element code to calculate the flow field parameters. Our numerical algorithm splits the viscous stress tensor into arbitrary Newtonian stress and a source term, which grows gradually during the iterative solution. Therefore, we get a better converging solution than the Picard method, especially for highly shear-thinning fluids. Secondly, considering two inert fluids in the mixing domain, we employ a Lagrangian-Eulerian approach to predict the shape of the interface between two fluids. The results of our numerical analysis provide us the required information to evaluate three implicit mixing criteria: the concentration variance, the striation thickness, and the mean strain function. Then we conduct a parametric study to investigate the effects of different parameters (geometry and rheology) on the distributive mixing state. In addition, we discuss which mixing criteria provide a better evaluation for distributive mixing.
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Affiliation(s)
- Mehdi Mostafaiyan
- Leibniz-Institut für Polymerforschung Dresden e. V , Deutschland, Hohe Str. 6 , 01069 Dresden , Germany
- Technische Universität Dresden, Institut für Werkstoffwissenschaft , Helmholtzstr. 7 , 01069 Dresden , Germany
| | - Sven Wießner
- Leibniz-Institut für Polymerforschung Dresden e. V , Deutschland, Hohe Str. 6 , 01069 Dresden , Germany
- Technische Universität Dresden, Institut für Werkstoffwissenschaft , Helmholtzstr. 7 , 01069 Dresden , Germany
| | - Gert Heinrich
- Technische Universität Dresden, Institut für Textilmaschinen und Textile Hochleistungswerkstofftechnik , Hohe Str. 6 , 01069 Dresden , Germany
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Kimura K, Nakayama Y, Kajiwara T. Distributive mixing characteristics of a Dulmage-type screw for a single-screw extruder: Experimental and numerical evaluation. CHEMICAL ENGINEERING JOURNAL ADVANCES 2021. [DOI: 10.1016/j.ceja.2021.100137] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Novel index for evaluating continuous mixing process with pulse injection of bimodal tracer particles. POWDER TECHNOL 2019. [DOI: 10.1016/j.powtec.2019.07.033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Park C, Lee J, Cho H, Kim Y, Cho S, Moon I. Strategies for evaluating distributive mixing of multimodal Lagrangian particles with novel bimodal bin count variance. POWDER TECHNOL 2018. [DOI: 10.1016/j.powtec.2017.11.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Xu B, Yu H, Kuang T, Turng LS. Evaluation of Mixing Performance in Baffled Screw Channel Using Lagrangian Particle Calculations. ADVANCES IN POLYMER TECHNOLOGY 2017. [DOI: 10.1002/adv.21577] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Baiping Xu
- Technology Development Center for Polymer Processing Engineering of Guangdong Colleges and Universities; Guangdong Industry Technical College; Guangzhou 510300 China
| | - Huiwen Yu
- Technology Development Center for Polymer Processing Engineering of Guangdong Colleges and Universities; Guangdong Industry Technical College; Guangzhou 510300 China
| | - Tangqing Kuang
- School of Mechanical & Electrical Engineering East China Jiaotong University; Nanchang 330013 China
| | - Lih-Sheng Turng
- Polymer Engineering Center; University of Wisconsin-Madison; Madison WI 53706
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Mostafaiyan M, Wiessner S, Heinrich G. Study of Dispersive and Distributive Mixing in a Converging Pipe. INT POLYM PROC 2016. [DOI: 10.3139/217.3179] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
The creeping flow of a polymeric melt in a converging pipe is analyzed using an in-house finite element code. An introduced power-law model considers the shear thinning behavior of the viscous liquid. Furthermore, distributive and dispersive mixing processes are evaluated with the mean strain function and the Manas-Zloczower mixing index, respectively. Using a parametric study, the dependency of the mixing criteria on the rheological and geometrical factors is investigated. Finally, a new analytical expression for the evaluation of the distributive mixing is suggested, based on simplifying assumptions and a curve fitting method.
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Affiliation(s)
- M. Mostafaiyan
- Leibniz-Institut für Polymerforschung Dresden e.V , Dresden , Germany
- Institut für Werkstoffwissenschaft , Technische Universität Dresden, Dresden , Germany
| | - S. Wiessner
- Leibniz-Institut für Polymerforschung Dresden e.V , Dresden , Germany
- Institut für Werkstoffwissenschaft , Technische Universität Dresden, Dresden , Germany
| | - G. Heinrich
- Leibniz-Institut für Polymerforschung Dresden e.V , Dresden , Germany
- Institut für Werkstoffwissenschaft , Technische Universität Dresden, Dresden , Germany
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Binder BJ, Landman KA. Quantifying evenly distributed states in exclusion and nonexclusion processes. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2011; 83:041914. [PMID: 21599207 DOI: 10.1103/physreve.83.041914] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2010] [Revised: 02/10/2011] [Indexed: 05/30/2023]
Abstract
Spatial-point data sets, generated from a wide range of physical systems and mathematical models, can be analyzed by counting the number of objects in equally sized bins. We find that the bin counts are related to the Pólya distribution. New measures are developed which indicate whether or not a spatial data set, generated from an exclusion process, is at its most evenly distributed state, the complete spatial randomness (CSR) state. To this end, we define an index in terms of the variance between the bin counts. Limiting values of the index are determined when objects have access to the entire domain and when there are subregions of the domain that are inaccessible to objects. Using three case studies (Lagrangian fluid particles in chaotic laminar flows, cellular automata agents in discrete models, and biological cells within colonies), we calculate the indexes and verify that our theoretical CSR limit accurately predicts the state of the system. These measures should prove useful in many biological applications.
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Affiliation(s)
- Benjamin J Binder
- School of Mathematical Sciences, University of Adelaide, South Australia 5005, Australia.
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Phelps JH, Tucker CL. Lagrangian particle calculations of distributive mixing: Limitations and applications. Chem Eng Sci 2006. [DOI: 10.1016/j.ces.2006.07.008] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Wang W, Manas-Zloczower I, Kaufman M. Entropic characterization of distributive mixing in polymer processing equipment. AIChE J 2006. [DOI: 10.1002/aic.690490704] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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WANG WINSTON, MANAS-ZLOCZOWER ICA, KAUFMAN MIRON. Entropy Time Evolution In A Twin-flight Single-screw Extruder And Its Relationship To Chaos. CHEM ENG COMMUN 2005. [DOI: 10.1080/00986440590473560] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Funatsu K, Kihara SI, Miyazaki M, Katsuki S, Kajiwara T. 3-D numerical analysis on the mixing performance for assemblies with filled zone of right-handed and left-handed double-flighted screws and kneading blocks in twin-screw extruders. POLYM ENG SCI 2004. [DOI: 10.1002/pen.10983] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Wang W, Manas-Zloczower I. Temporal distributions: The basis for the development of mixing indexes for scale-up of polymer processing equipment. POLYM ENG SCI 2004. [DOI: 10.1002/pen.10807] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Ishikawa T, Kihara SI, Funatsu K. 3-D non-isothermal flow field analysis and mixing performance evaluation of kneading blocks in a co-rotating twin srew extruder. POLYM ENG SCI 2004. [DOI: 10.1002/pen.10781] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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