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TECHNICAL PAPERS

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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References

Anno,  J. N., Walowit,  J. A., and Allen,  C. M., 1969, “Load Support and Leakage From Microasperity-Lubricated Face Seals,” ASME J. Lubr. Technol., pp. 726–731.
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Stephens, L. S., Siripuram, R., Hayden, M., and McCartt, B., 2002, “Deterministic Microasperities on Bearings and Seals Using a Modified LIGA Process,” Proceedings of ASME Turbo Expo 2002, Paper No. GT-2002-30289.
Kortikar, S. N., Stephens, L. S., Hadinata, P. C., and Siripuram, R. B., 2003, “Manufacturing of Microasperities on Thrust Surfaces Using Ultraviolet Photolithography,” Proceedings of the ASPE 2003 Winter Topical Meeting, 28 , pp. 148–153.
Becker,  E. W., Ehrfeld,  W., Hagmann,  P., Maner,  A., and Munchmeyer,  D., 1986, “Fabrication of Microstructures With Extreme Structural Heights by Synchrotron Radiation Lithography, Galvanoforming and Plastic Moulding (LIGA Process),” Microelectron. Eng., 4, pp. 35–56.
Hagmann, P., Ehrfeld, W., and Vollmer, H., 1987, “Fabrication of Microstructures With Extreme Structural Heights by Reaction Injection Molding,” Makromolkulare Chemie-Macromolecular Symposia, 24 , pp. 241–251.
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Senturia, S. D., 2001, Microsystem Design, Kluwer Academic Publishers, Boston, MA.
Hamilton,  D. B., Walowit,  J. A., and Allen,  C. M., 1966, “A Theory of Lubrication by Microirregularities,” ASME J. Basic Eng., pp. 177–185.
Hamilton,  D. B., Walowit,  J. A., and Allen,  C. M., 1968, “Microasperity Lubrication,” ASME J. Lubr. Technol., pp. 351–355.
Etsion,  I., and Burstein,  L., 1996, “A Model for Mechanical Seals With Regular Microsurface Structure,” Tribol. Trans., 39(3), pp. 677–683.
Etsion,  I., Kligerman,  Y., and Halperin,  G., 1999, “Analytical and Experimental Investigation of Laser-Textured Mechanical Seal Faces,” Tribol. Trans., 42(3), pp. 511–516.
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Arghir,  M., Roucou,  N., Helene,  M., and Frene,  I., 2003, “Theoretical Analysis of the Incompressible Laminar Flow in a Macro-Roughness Cell,” ASME J. Tribol., 125(2), pp. 309–318.

Figures

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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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