0
Research Papers: Elastohydrodynamic Lubrication

The Effect of Oil Droplet on the Lubrication Performance

[+] Author and Article Information
Shengguang Zhang

School of Mechanical Engineering,
Beijing Institute of Technology,
Beijing 100081, China

Wenzhong Wang

School of Mechanical Engineering,
Beijing Institute of Technology,
Beijing 100081, China
e-mail: wangwzhong@bit.edu.cn

Xinming Li, Feng Guo

School of Mechanical Engineering,
Qingdao Technological University,
Qingdao, Shandong 266033, China

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received June 14, 2015; final manuscript received January 5, 2016; published online May 4, 2016. Assoc. Editor: Xiaolan Ai.

J. Tribol 138(3), 031506 (May 04, 2016) (9 pages) Paper No: TRIB-15-1195; doi: 10.1115/1.4032959 History: Received June 14, 2015; Revised January 05, 2016

Oil–air lubrication is widely used in the high-speed rotary machines; the oil is usually in the form of discrete droplets. The lubrication behavior of the oil droplet is rarely investigated. This paper investigates the effect of the oil droplet on lubrication performance based on the developed transient lubrication model with consideration of starvation conditions. The oil droplet is modeled as spherical segment with different heights, base radius, and positions, which will change the inlet oil supply conditions. The results show that the oil droplet with large size can generate thick oil film which is close to the one in fully flooded condition and can remain long time; the position of the oil droplet entering the contact region also has significant effect on the lubrication performance.

FIGURES IN THIS ARTICLE
<>
Copyright © 2016 by ASME
Your Session has timed out. Please sign back in to continue.

References

Yeo, S. H. , Ramesh, K. , and Zhong, Z. W. , 2002, “ Ultra-High-Speed Grinding Spindle Characteristics Upon Using Oil/Air Mist Lubrication,” Int. J. Mach. Tools Manuf., 42(7), pp. 815–823. [CrossRef]
Wu, C.-H. , and Kung, Y.-T. , 2005, “ A Parametric Study on Oil/Air Lubrication of a High-Speed Spindle,” Precis. Eng., 29(2), pp. 162–167. [CrossRef]
Jeng, Y.-R. , and Gao, C. C. , 2001, “ Investigation of the Ball-Bearing Temperature Rise Under an Oil-Air Lubrication System,” Proc. Inst. Mech. Eng., Part J, 215(2), pp. 139–148. [CrossRef]
Ramesh, K. , Yeo, S. H. , Zhong, Z. W. , and Yui, A. , 2002, “ Ultra-High-Speed Thermal Behavior of a Rolling Element Upon Using Oil–Air Mist Lubrication,” J. Mater. Process. Technol., 127(2), pp. 191–198. [CrossRef]
Jiang, S. , and Mao, H. , 2011, “ Investigation of the High Speed Rolling Bearing Temperature Rise With Oil-Air Lubrication,” ASME J. Tribol., 133(2), p. 021101. [CrossRef]
Willenborg, K. , Klingsporn, M. , Tebby, S. , Ratcliffe, T. , Gorse, P. , Dullenkopf, K. , and Wittig, S. , 2008, “ Experimental Analysis of Air/Oil Separator Performance,” ASME J. Eng. Gas Turbines Power, 130(6), p. 062503. [CrossRef]
Höhn, B.-R. , Michaelis, K. , and Otto, H.-P. , 2009, “ Minimised Gear Lubrication by a Minimum Oil/Air Flow Rate,” Wear, 266(3), pp. 461–467. [CrossRef]
Ranger, A. P. , Ettles, C. M. M. , and Cameron, A. , 1975, “ The Solution of the Point Contact Elastohydrodynamic Problem,” Proc. R. Soc. London, Ser. A, 346(1645), pp. 227–244. [CrossRef]
Hamrock, B. J. , and Dowson, D. , 1976, “ Isothermal Elastohydrodynamic Lubrication of Point Contacts: Part 1—Theoretical Formulation,” J. Lubr. Technol., 98(2), pp. 223–229. [CrossRef]
Oh, K. P. , and Rohde, S. M. , 1977, “ Numerical Solution of the Point Contact Problem Using the Finite Element Method,” Int. J. Numer. Methods Eng., 11(10), pp. 1507–1518. [CrossRef]
Evans, H. P. , and Snidle, R. W. , 1981, “ Inverse Solution of Reynolds' Equation of Lubrication Under Point-Contact Elastohydrodynamic Conditions,” ASME J. Lubr. Tech., 103(4), pp. 539–546.
Zhu, D. , and Wen, S.-Z. , 1984, “ A Full Numerical Solution for the Thermoelastohydrodynamic Problem in Elliptical Contacts,” ASME J. Tribol., 106(2), pp. 246–254. [CrossRef]
Lubrecht, A. A. , 1987, “ The Numerical Solution of the Elastohydrodynamically Lubricated Line and Point Contact Problem, Using Multigrid Techniques,” Ph.D. thesis, University of Twente, Enschede, The Netherlands.
Venner, C. H. , 1991, “ Multilevel Solution of the EHL Line and Point Contact Problems: Proefschrift,” Ph.D. thesis, University of Twente, Enschede, The Netherlands.
Ai, X. L. , 1993, “ Numerical Analyses of Elastohydrodynamically Lubricated Line and Point Contacts With Rough Surfaces by Using Semi-System and Multigrid Methods,” Ph.D. thesis, Northwestern University, Evanston, IL.
Xu, G. , and Sadeghi, F. , 1996, “ Thermal EHL Analysis of Circular Contacts With Measured Surface Roughness,” ASME J. Tribol., 118(3), pp. 473–482. [CrossRef]
Zhu, D. , and Ai, X. L. , 1997, “ Point Contact EHL Based on Optically Measured Three-Dimensional Rough Surfaces,” ASME J. Tribol., 119(3), pp. 375–384. [CrossRef]
Zhu, D. , and Hu, Y. Z. , 1999, “ The Study of Transition From Full Film Elastohydrodynamic to Mixed and Boundary Lubrication,” The Advancing Frontier of Engineering Tribology, 1999 STLE/ASME HS Cheng Tribology Surveillance, STLE, Park Ridge, IL, pp. 150–156.
Hu, Y. Z. , and Dong, Z. , 2000, “ A Full Numerical Solution to the Mixed Lubrication in Point Contacts,” ASME J. Tribol., 122(1), pp. 1–9. [CrossRef]
Wedeven, L. D. , Evans, D. , and Cameron, A. , 1971, “ Optical Analysis of Ball Bearing Starvation,” ASME J. Tribol., 93(3), pp. 349–361.
Chiu, Y. P. , 1974, “ An Analysis and Prediction of Lubricant Film Starvation in Rolling Contact Systems,” ASLE Trans., 17(1), pp. 22–35. [CrossRef]
Pemberton, J. , and Cameron, A. , 1976, “ A Mechanism of Fluid Replenishment in Elastohydrodynamic Contacts,” Wear, 37(1), pp. 185–190. [CrossRef]
Jakobsson, B. , and Floberg, L. , 1957, “ The Finite Journal Bearing, Considering Vaporization,” Trans Chalmers University Technology, Goteborg, Sweden, Report No. 190.
Elrod, H. G. , 1981, “ A Cavitation Algorithm,” ASME J. Tribol., 103(3), pp. 350–354.
Chevalier, F. , Lubrecht, A. A. , Cann, P. M. E. , Colin, F. , and Dalmaz, G. , 1998, “ Film Thickness in Starved EHL Point Contacts,” ASME J. Tribol., 120(1), pp. 126–133. [CrossRef]
Van Nijen, G. C. , 2001, “ On the Overrolling of Local Imperfection in Rolling Bearings,” Ph.D. thesis, University of Twente, Enschede, The Netherlands.
Damiens, B. , Venner, C. H. , Cann, P. M. E. , and Lubrecht, A. A. , 2004, “ Starved Lubrication of Elliptical EHD Contacts,” ASME J. Tribol., 126(1), pp. 105–111. [CrossRef]
Wijnant, Y. H. , 1998, “ Contact Dynamics in the Field of Elastohydrodynamic Lubrication,” Ph.D. thesis, University of Twente, Enschede, The Netherlands.
Wang, W. Z. , Li, S. S. , Shen, D. , Zhang, S. G. , and Hu, Y. Z. , 2012, “ A Mixed Lubrication Model With Consideration of Starvation and Interasperity Cavitations,” Proc. Inst. Mech. Eng., Part J, 226(12), pp. 1023–1038. [CrossRef]
Johnson, K. L. , 1987, Contact Mechanics, Cambridge University Press, London.
Dowson, D. , Higginson, G. R. , Archard, J. , and Crook, A. , 1977, Elasto-Hydrodynamic Lubrication, Pergamon Press, Oxford, UK.
Liu, Y. C. , Wang, Q. J. , Wang, W. Z. , Hu, Y. Z. , and Zhu, D. , 2006, “ Effects of Differential Scheme and Mesh Density on EHL Film Thickness in Point Contacts,” ASME J. Tribol., 128(3), pp. 641–653. [CrossRef]

Figures

Grahic Jump Location
Fig. 1

The measurement of oil droplets after injecting from air–oil mixer (a) and its modeling (b)

Grahic Jump Location
Fig. 2

The average film thickness and its derivative

Grahic Jump Location
Fig. 3

The average oil film thickness and duration of the fully flooded phase for different radii of oil droplets: (a) the average oil film thickness distribution along the time and (b) duration exceed 94.77% of the fully flooded phase

Grahic Jump Location
Fig. 4

The contact area ratio for different radii of oil droplets

Grahic Jump Location
Fig. 5

The average oil film thickness for oil droplet with different heights and the same base radius r = 0.6a

Grahic Jump Location
Fig. 6

The change of average film thicknesses when the droplet enters the contact zone from different positions

Grahic Jump Location
Fig. 7

The film thickness and pressure profiles along the centerline and contour plots of film thickness at different instants for oil droplet positioned at y = 0

Grahic Jump Location
Fig. 8

The film thickness and pressure profiles along the centerline and contour plots of film thickness at different instants with different entering positions of oil droplet. (a) The results for oil droplet positioned at y = 0.5a. (b) The results for oil droplet positioned at y = a.

Grahic Jump Location
Fig. 9

Contour plots of film thickness obtained from (a) experiment and (b) simulation

Grahic Jump Location
Fig. 10

Comparison of film thickness profiles at different instants between experiment and simulation: (a) droplet entering the contact region and (b) droplet leaving the contact region

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In