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Rivulet Instability with Effect of Coriolis Force

Published online by Cambridge University Press:  05 May 2011

H.-C. Cho  and
F.-C. Chou
H.-C. Cho*
Affiliation:
Department of Mechanical Engineering, National Central University, Jhong-li, Taiwan 32001, R.O.C.
F.-C. Chou*
Affiliation:
Department of Mechanical Engineering, National Central University, Jhong-li, Taiwan 32001, R.O.C.
*
*Graduate student
**Professor
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Abstract

The effect of Coriolis force on the rivulet (fingering) instability, the onset of rivulet phenomena during spin coating, is investigated by flow visualization experiments incorporating with dimensional analysis. This study demonstrates that the Coriolis force will affect significantly the critical radius of rivulet instability and the deflection angle of instability rivulet. For the cases of low Bond number, the effect of Coriolis force is a stabilizing factor, and the dimensionless critical radius increases slightly with increasing rotational Reynolds number Reω. In the case of high Bond number, the effect of Coriolis force becomes a destabilizing factor while Reω < 1, and a characteristic length is found by balancing the viscous force with the surface tension. For Reω > 1, the radial Corilois force, which is always pointing inward, plays a stabilizing role with magnitude Reω2.

Keywords

Coriolis forceRivulet instabilitySpin coating
Type
Articles
Information
Journal of Mechanics , Volume 22 , Issue 3 , September 2006 , pp. 221 - 227
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2006

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