Effect of Deterministic Asperity Geometry on Hydrodynamic Lubrication

[+] Author and Article Information
Ravinder B. Siripuram, Lyndon S. Stephens

Bearings and Seals Laboratory, Department of Mechanical Engineering, University of Kentucky, 151 Ralph G. Anderson Building, Lexington, KY 40506-0503

J. Tribol 126(3), 527-534 (Jun 28, 2004) (8 pages) doi:10.1115/1.1715104 History: Received March 12, 2003; Revised July 22, 2003; Online June 28, 2004
Copyright © 2004 by ASME
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Hexagonal, nickel surface textures manufactured at the Bearings and Seals Laboratory 4: (a) positive asperities fabricated using LIGA; and (b) negative asperities (cavities) fabricated using UV Photolithography.
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Microasperities on thrust ring
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(a) Side view of a positive asperity; (b) side view of a negative asperity; and (c) typical unit cell.
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Benchmarking of numerical solution
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(a) Pressure distribution for a positive square asperity, δ2=0.05; (b) pressure distribution for a positive square asperity, δ2=0.5; and (c) pressure distribution for a negative square asperity, δ2=0.5.
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(a) Pressure distribution for a positive triangular asperity, δ2=0.10; and (b) pressure distribution for a negative triangular asperity, δ2=0.10.
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Comparison of coefficient of friction for a typical positive and negative asperity
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Leakage due to ΔP across ring
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Comparison of leakage for different cases of a triangle



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