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Measurement of the drift of a droplet due to the presence of a plane

 

作者: Jeffrey R. Smart,   David T. Leighton,  

 

期刊: Physics of Fluids A  (AIP Available online 1991)
卷期: Volume 3, issue 1  

页码: 21-28

 

ISSN:0899-8213

 

年代: 1991

 

DOI:10.1063/1.857856

 

出版商: AIP

 

数据来源: AIP

 

摘要:

The drift of a deformable droplet of low viscosity (viscosity ratio &lgr;=0.08) in a Couette device is examined. The drift is measured both in the plane of shear (due to the rigid outer bounding walls of the Couette device) and also normal to the plane of shear (due to the upper bounding stress‐free surface). A general relationship between normal stresses induced by the deformation of a droplet in an arbitrary shear flow and the leading‐order drift normal to rigid and stress‐free plane surfaces is described theoretically. This relationship is consistent with previous theoretical predictions for droplet migration in shear flows, and is used to compare results from the drift measurement experiments with first‐order deformation theories. The measured drift velocities are in reasonable agreement with the theory of Schowalteretal. [J. Colloid Interface Sci.26, 152 (1968)].

 

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