Granular Flow Lubrication: Continuum Modeling of Shear Behavior

[+] Author and Article Information
C. Fred Higgs

Mechanical Engineering Department, Carnegie Mellon University, Pittsburgh, PA 15213-3890

John Tichy

Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180-3590

J. Tribol 126(3), 499-510 (Jun 28, 2004) (12 pages) doi:10.1115/1.1691437 History: Received March 07, 2002; Revised July 24, 2003; Online June 28, 2004
Copyright © 2004 by ASME
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Grahic Jump Location
Schematic of roughness factors. Roughness factors R are defined as (a) the fraction of lateral momentum imparted by the surface, and (b) the fraction of granular particles that fits between wall disks. The surface in the latter case is characterized as a flat wall with cylindrical disks.
Grahic Jump Location
Variations of flow velocity with load (in Pa) across the nondimensional film coordinate y/H
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Variations of solid fraction with load (in Pa) across the nondimensional film coordinate y/H
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The effect of nominal shear rate on the mean solid fraction
Grahic Jump Location
The effect of shear rate on the average shear stress at the top (y=H) surface
Grahic Jump Location
The effect of load on the mean solid fraction
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The effect of load on the shear stress at the top (y=H) surface
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The effect of load on the slip velocity at the bottom surface
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Effect of the nominal shear rate on the shear stress for smooth surfaces (R=0.1)



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