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Influence of viscoelasticity on drop deformation and orientation in shear flow. Part 2: Dynamics

作     者:Verhulst, Kristof Cardinaels, Ruth Moldenaers, Paula Afkhami, Shahriar Renardy, Yuriko 

作者机构: Katholieke Universiteit Leuven Department of Chemical Engineering W. de Croylaan 46 B 3001 Heverlee (Leuven) Belgium  Department of Mathematics and ICAM 460 McBryde Hall Virginia Polytechnic Institute and State University Blackburg VA 24061-0123 USA 

出 版 物:《Journal of Non-Newtonian Fluid Mechanics》 

年 卷 期:2009年第156卷第1-2期

页      面:44-57页

核心收录:

学科分类:0801[工学-力学类] 

基  金:FWO-Vlaanderen  [NSF-DMS-0456086]  [NCSA CTS060022]  [GOA 03/06] 

主  题:Blend morphology  Drop breakup  Drop deformation  Oldroyd-B  Viscoelasticity  VOF method Deformation  Drop breakup  Dynamics  Elasticity  Experiments  Shear flow  Three dimensional  Viscoelasticity  Viscosity  Blend morphology  Boger fluids  Capillary numbers  Deborah numbers  Drop deformation  Drop deformations  Drop dynamics  Experimental studies  Flow histories  Matrix viscosities  Newtonian drops  Newtonians  Numerical simulations  Oldroyd-B  Viscoelastic drops  Viscoelastic fluids  Viscoelastic liquids  Viscoelastic matrixes  VOF method  Drops 

摘      要:An experimental study of drop dynamics under shear is conducted for five fluid pairs: a reference Newtonian system, two systems with a viscoelastic drop in a Newtonian matrix, one with a Newtonian drop in a viscoelastic matrix, all at drop to matrix viscosity ratio lambda = 1.5. and a separate case at, = 0.75. The viscoelastic liquids are either a Boger fluid or a shear-thinning viscoelastic fluid satisfying an Ellis model. Deborah numbers in the range 1-2 and a range of capillary numbers from low to above breakup conditions are addressed. The results focus on three aspects: relaxation after cessation of shear, a new viscoelastic drop breakup scenario, and the effect of shear flow history on drop breakup. Numerical simulations with the 3D volume-of-fluid PROST method complement the experimental results. (c) 2008 Elsevier B.V. All rights reserved.

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