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Soft Matter Vol - 8 Issue - 6

Soft Matter Vol - 8 Issue - 5

Hydrodynamic diffusion of a suspension of elastic capsules in bounded simple shear flow

Content Provider	Royal Society of Chemistry (RSC)
Author	Tan, Marcus Hwai-Yik Chiam, K.-H. Le, Duc-Vinh
Copyright Year	2012
Abstract	A suspension of red blood cells in a flow undergoes hydrodynamic or shear-induced diffusion. It is known from experiments that deoxygenated or stiffer red blood cells have a lower hydrodynamic diffusion coefficient compared to oxygenated or softer red blood cells. In this paper, we numerically calculate the hydrodynamic diffusion coefficients of a suspension of elastic capsules of viscosity ratio unity and as a function of volume fraction, elastic capillary number and channel height in a bounded simple shear flow. We show that the time required for the suspension to reach the diffusive regime in the direction perpendicular to the shear plane decreases with channel height. In a narrow channel, the effect of capsule elasticity is to delay the approach to a diffusive regime. However, the motion in the direction parallel to the velocity gradient is always subdiffusive. We show that the hydrodynamic diffusion coefficient in the direction perpendicular to the shear plane varies linearly with capsule volume fraction up to about 25%. In addition, it does not increase monotonously with elastic capillary number but drops when the capsules become sufficiently soft. Finally, it displays a weak dependence on the channel height.
Starting Page	2243
Ending Page	2251
Page Count	9
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	8
Issue Number	7
Journal	Soft Matter
DOI	10.1039/c2sm06496k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Viscosity Simple shear Capillary number Diffusion Correlation and dependence
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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