Particle-wall collision in a viscoelastic fluid

被引：29
|
作者：
Ardekani, A. M. [1 ]
Joseph, D. D. [1 ,2 ]
Dunn-Rankin, D. [1 ]
Rangel, R. H. [1 ]
机构：
[1] Univ Calif Irvine, Dept Mech & Aerosp Engn, Irvine, CA 92697 USA
[2] Univ Minnesota, Dept Aerosp Engn & Mech, Minneapolis, MN 55455 USA
来源：
JOURNAL OF FLUID MECHANICS | 2009年 / 633卷
基金：
美国国家科学基金会;
关键词：
SHEAR-WAVE SPEEDS; VISCOUS-FLUID; 2; SPHERES; ELASTOHYDRODYNAMIC COLLISION; DIFFERENT LIQUIDS; ELASTIC-MODULI; MOTION; VISCOSITY;
D O I：
10.1017/S0022112009990632
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
In this study, we present experimental results on particle-wall collision in viscoelastic fluids. A sphere is released in a tank filled with poly(ethylene-oxide) (PEO) mixed with water with varying concentrations up to 1.5%. The effect of Stokes and Deborah numbers on the rebound velocity of a spherical particle colliding onto a wall is considered. It has been observed that the slope at which the coefficient of restitution increases with Stokes number is smaller for higher Deborah numbers. Higher rebound occurs for higher PEO concentration at the same stokes number. However, the results for the coefficient of restitution in polymeric liquids can be collapsed together with the Newtonian fluid behaviour if one defines the Stokes number based on the local strain rate.
引用
收藏
页码：475 / 483
页数：9
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