Settling of an isolated spherical particle in a yield stress shear thinning fluid

被引：124
|
作者：
Putz, A. M. V. [1 ]
Burghelea, T. I. [1 ]
Frigaard, I. A. [1 ,2 ]
Martinez, D. M. [3 ]
机构：
[1] Univ British Columbia, Dept Math, Vancouver, BC V6T 1Z2, Canada
[2] Univ British Columbia, Dept Mech Engn, Vancouver, BC V6T 1Z4, Canada
[3] Univ British Columbia, Dept Chem & Biol Engn, Vancouver, BC V6T 1Z3, Canada
来源：
PHYSICS OF FLUIDS | 2008年 / 20卷 / 03期
关键词：
D O I：
10.1063/1.2883937
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
We visualize the flow induced by an isolated non-Brownian spherical particle settling in a shear thinning yield stress fluid using particle image velocimetry. With Re < 1, we show a breaking of the fore-aft symmetry and relate this to the rheological properties of the fluid. We find that the shape of the yield surface approximates that of an ovoid spheroid with its major axis approximately five times greater than the radius of the particle. The disagreement of our experimental findings with previous numerical simulations is discussed. (C) 2008 American Institute of Physics.
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页数：11
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