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TECHNICAL PAPERS

Numerical Study of a Rotary Lip Seal With a Quasi-Random Sealing Surface

[+] Author and Article Information
Fanghui Shi, Richard F. Salant

George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0405

J. Tribol 123(3), 517-524 (Jul 06, 2000) (8 pages) doi:10.1115/1.1308028 History: Received February 07, 2000; Revised July 06, 2000
Copyright © 2001 by ASME
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References

Jagger,  E. T., 1957, “Rotary shaft seals: the sealing mechanism of synthetic rubber seals running at atmospheric pressure,” Proc. Inst. Mech. Eng., 171, pp. 597–616.
Jagger, E. T., 1957, “Study of the lubrication of synthetic rubber rotary shaft seals,” Proc. Conf. on Lubrication and Wear, Institution of Mechanical Engineers, London, pp. 409–415.
Horve, L. A., 1992, “Understanding the sealing mechanism of the radial lip seal for rotating shafts,” Proc. 13th BHRG International Conference on Fluid Sealing, Brugge, Belgium, Kluwer, Dordrecht, pp. 5–19.
Johnston,  D. E., 1973, “Further experiments on the sealing mechanism of a synthetic rubber lip type seal operating on a rotating shaft,” Proc. Inst. Mech. Eng., 187, p. D111.
Nakamura, K., and Kawahara, Y., 1984, “An investigation of sealing properties of lip seals through observations of sealing surfaces under dynamic condition,” Proc. 10th BHRA International Conference on Fluid Sealing, Innsbruck, Austria, BHRA, Cranfield, pp. 87–105.
Nakamura,  K., 1987, “Sealing mechanism of rotary shaft lip-type seals,” Tribol. Int., 20, pp. 90–101.
Jagger,  E. T., and Walker,  P. S., 1966–1967, “Further studies of the lubrication of synthetic rubber rotary shaft seals,” Proc. Inst. Mech. Eng., Part I, 181, pp. 191–204.
Johnston, D. E., 1978, “Using the frictional torque of rotary shaft seals to estimate the film parameters and the elastomer surface characteristics,” Proc. 8th BHRA International Conference on Fluid Sealing, Durham, UK, BHRA, Cranfield, pp. C1-1–C1-20.
Gabelli, A., 1988, “Micro-elastohydrodynamic lubricant film formation in rotary lip seal contacts,” Proc. 15th Leeds-Lyon Symposium on Tribology, Leeds, Elsevier, Amsterdam, pp. 57–68.
Gabelli,  A., and Poll,  G., 1992, “Formation of lubricant film in rotary sealing contacts: part I—lubricant film modeling,” ASME J. Tribol., 114, pp. 280–289.
Salant,  R. F., and Flaherty,  A. L., 1994, “Elastohydrodynamic analysis of reverse pumping in rotary lip seals with microundulations,” ASME J. Tribol., 116, pp. 56–62.
Salant,  R. F., and Flaherty,  A. L., 1995, “Elastohydrodynamic analysis of reverse pumping in rotary lip seals with microasperities,” ASME J. Tribol., 117, pp. 53–59.
Salant,  R. F., 1996, “Elastohydrodynamic model of the rotary lip seal,” ASME J. Tribol., 118, pp. 292–296.
Day,  K., and Salant,  R. F., 1999, “Thermal elastohydrodynamic model of a radial lip seal—Part I: analysis and base results,” ASME J. Tribol., 121, pp. 1–10.
Shi,  F., and Salant,  R. F., 2000, “A mixed soft elastohydrodynamic lubrication model with interasperity cavitation and surface shear deformation,” ASME J. Tribol., 122, pp. 308–316.
Poll,  G., 1997, “Rotary lip seal with an ingested meniscus,” ASME J. Tribol., 119, pp. 887–888.
Patir,  N., 1978, “A numerical procedure for random generation of rough surfaces,” Wear, 47, pp. 263–277.
Shi, F., 1999, “A deterministic mixed-elastohydrodynamic lubrication model and analysis of lip seal performance,” Ph.D. dissertation, Georgia Institute of Technology, Atlanta, GA.
Horve, L. A., 1996, Shaft Seals for Dynamic Applications, Marcel Dekker, New York.
van Leeuwen, H., and Wolfert, M., 1996, “The sealing and lubrication principles of plain radial lip seals: an experimental study of local tangential deformations and film thickness,” Proc. 23rd Leeds-Lyon Symposium on Tribology, Leeds, UK, Elsevier, Amsterdam, pp. 219–232.
Qian,  D. S., 1984, “The sealing mechanism and design factors of radial lip seals for crankshafts,” Neiranji GongCheng/Chinese Internal Combust. Engine Eng., 5, pp. 10–13.
Kammüller, M., 1986, “Zur Abdichtwirkung von Radial-Wellendichtringen,” Dr.-Ing. Thesis, Universität Stuttgart, Stuttgart, Germany.
Müller, H. K., 1987, “Concepts of sealing mechanism of rubber lip type rotary shaft seals,” Proc. 11th BHRA International Conference on Fluid Sealing, Cannes, France, Elsevier, London, pp. 698–709.
Salant,  R. F., 1999, “Theory of lubrication of elastomeric rotary shaft seals,” IMechE J. Eng. Tribol.,213, pp. 189–201.
Nau, B. S., 1963, “An investigation into the nature of the interface film, the pressure generation mechanism and centripetal pumping in mechanical seals,” BHRA Report No. RR 754, BHRA, Cranfield.

Figures

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(a) Pressure distribution without cavitation, Λ=100,p0=1.0,k=20; (b) pressure distribution with cavitation, Λ=100, p0=1.0,k=20
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Effect of interference on reverse pumping rate
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Effect of interference on friction coefficient
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Effect of interference on average film thickness and roughness ratio
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Effect of undeformed roughness height on reverse pumping rate
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Effect of undeformed roughness height on friction coefficient
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Schematic of sealing zone
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Reverse pumping rate versus speed
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Friction coefficient versus speed
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Average film thickness versus speed
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Contact area ratio versus speed
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Cavitation area ratio versus speed
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Contact force ratio versus speed
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Roughness ratio versus speed
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Effect of shear deformation on reverse pumping rate
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(a) Lip surface profiles with, and without, shear deformation; (b) mean plane profiles with, and without, shear deformation
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(a) Reverse pumping rate versus boundary pressure and tilting number, Λ=1000; (b) density versus boundary pressure and tilting number, Λ=1000
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(a) Reverse pumping rate versus speed and tilting number, p0=1.0; (b) density versus speed and tilting number, p0=1.0
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(a) Reverse pumping rate versus boundary pressure and speed, k=20; (b) density versus boundary pressure and speed, k=20
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Effect of undeformed roughness height on average film thickness and roughness ratio
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Effect of sealed pressure on reverse pumping rate

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