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Experimental study of gravitation effects in the flow of a particle-laden thin film on an inclined plane

Phys. Fluids 21, 083305 (2009); doi:10.1063/1.3208076

Published 20 August 2009

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Thomas Ward,1 Chi Wey,2 Robert Glidden,2 A. E. Hosoi,3 and A. L. Bertozzi1
1Department of Mathematics, University of California, Los Angeles, California 90095-1555, USA
2Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, California 90095-1597, USA
3Department of Mechanical Engineering, Hatsopoulos Microfluids Laboratory, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
The flow of viscous, particle-laden wetting thin films on an inclined plane is studied experimentally as the particle concentration is increased to the maximum packing limit. The slurry is a non-neutrally buoyant mixture of silicone oil and either solid glass beads or glass bubbles. At low concentrations (phi<0.45), the elapsed time versus average front position scales with the exponent predicted by Huppert [Nature (London) 300, 427 (1982)]. At higher concentrations, the average front position still scales with the exponent predicted by Huppert on some time interval, but there are observable deviations due to internal motion of the particles. At the larger concentration values and at later times, the departure from Huppert is seen to strongly depend on total slurry volume VT, inclination angle alpha, density difference, and particle size range. ©2009 American Institute of Physics
History: Received 20 April 2009; accepted 29 July 2009; published 20 August 2009
Permalink: http://link.aip.org/link/?PHFLE6/21/083305/1
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1070-6631 (print)   1089-7666 (online)
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REFERENCES (20)
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