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http://dx.doi.org/10.9725/kstle.2017.33.6.288

Thermohydrodynamic Lubrication Analysis of Surface-Textured Parallel Slider Bearing: Effect of Dimple Depth  

Park, TaeJo (School of Mechanical Engineering, ERI, Gyeongsang National University)
Kim, MinGyu (Graduate School, School of Mechanical & Aerospace Engineering, Gyeongsang National University)
Publication Information
Tribology and Lubricants / v.33, no.6, 2017 , pp. 288-295 More about this Journal
Abstract
In order to improve the efficiency and reliability of the machine, the friction should be minimized. The most widely used method to minimize friction is to maintain the fluid lubrication state. However, we can reduce friction only up to a certain limit because of viscosity. As a result of several recent studies, surface texturing has significantly reduced the friction in highly sliding machine elements, such as mechanical seals and thrust bearings. Thus far, theoretical studies have mainly focused on isothermal/iso-viscous conditions and have not taken into account the heat generation, caused by high viscous shear, and the temperature conditions on the bearing surface. In this study, we investigate the effect of dimple depth and film-temperature boundary conditions on the thermohydrodynamic (THD) lubrication of textured parallel slider bearings. We analyzed the continuity equation, the Navier-Stokes equation, the energy equation, and the temperature-viscosity and temperature-density relations using a computational fluid dynamics (CFD) code, FLUENT. We compare the temperature and pressure distributions at various dimple depths. The increase in oil temperature caused by viscous shear was higher in the dimple than in the bearing outlet because of the action of the strong vortex generated in the dimple. The lubrication characteristics significantly change with variations in the dimple depths and film-temperature boundary conditions. We can use the current results as basic data for optimum surface texturing; however, further studies are required for various temperature boundary conditions.
Keywords
dimple; friction reduction; parallel slider bearing; surface texturing; thermohydrodynamic lubrication; thermal wedge;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
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1 Etsion, I., "State of the art in laser surface texturing", ASME J. Tribol., Vol. 127, No. 1, pp. 248-253, 2005.   DOI
2 Gropper, D., Wang, L., Harvey, T. J., "Hydrodynamic lubrication of textured surfaces: A review of modeling techniques and key findings", Tribol. Int., Vol. 94, pp. 509-529, 2016.   DOI
3 Park, T. J., Hwang, Y. G., "Lubrication characteristics of laser textured parallel thrust bearing: Part 1 - Effect of dimple depth", J. Korean Soc. Tribol. Lubr. Eng., Vol. 25, No. 5, pp. 305-310, 2009.
4 Park, T. J., Hwang, Y. G., "Lubrication characteristics of laser textured parallel thrust bearing: Part 2 - Effect of dimple location", J. Korean Soc. Tribol. Lubr. Eng., Vol. 26, No. 1, pp. 1-6, 2010.
5 Park, T. J., "Lubrication characteristics of laser textured parallel thrust bearing: Part 3 - Effect of number of dimple", J. Korean Soc. Tribol. Lubr. Eng., Vol. 27, No. 6, pp. 302-307, 2011.   DOI
6 Park, T. J., "Lubrication characteristics of laser textured parallel thrust bearing: Part 4 - Effect of dimple shape", J. Korean Soc. Tribol. Lubr. Eng., Vol. 27, No. 6, pp. 338-343, 2011.   DOI
7 Park, T. J., Lee, J. O., "Lubrication characteristics of micro-textured slider bearing: Effect of dimple density", Trans. Korean Soc. Mech. Eng. A, Vol. 37, No. 4, pp. 437-442, 2013.   DOI
8 Cameron, A., "The viscosity wedge", ASLE Trans., Vol. 1, No. 2, pp. 248-253, 1958.   DOI
9 Lebeck, A. O., "Parallel sliding load support in the mixed friction regime. Part 1 - The experimental data", ASME J. Tribol., Vol. 109, No. 1, pp. 189-195, 1987.   DOI
10 Khonsari, M. M., "A review of thermal effects in hydrodynamic bearings. Part I: Slider and thrust bearings", ASLE Trans., Vol. 30, No. 1, pp. 19-25, 1987.   DOI
11 Cui, J., Kaneta, M., Yang, P., Yang, P., "The relation between thermal wedge and thermal boundary conditions for the load-carrying capacity of a rectangular pad and a slider with parallel gaps", ASME J. Tribol., Vol. 138, No. 2, 024502-1-6.
12 Park, T. J., Kim, M. G., "Effect of film-temperature boundary conditions on the lubrication performance of parallel slider bearing", J. Korean Soc. Tribol. Lubr. Eng., Vol. 33, No. 5, pp. 207-213, 2017.
13 Cupillard, S., Glavatskih, S., Cervantes, M. J., "3D thermohydrodynamic analysis of a textured slider", Tribol. Int., Vol. 42, pp. 1487-1495, 2009.   DOI
14 Papadopoulos, C. I., Kaiktsis, L., Fillon, M., "Computational fluid dynamics thermohydrodynamic analysis of three-dimensional sector-pad thrust bearings with rectangular dimples", ASME J. Tribol., Vol. 136, No. 1, pp. 011702-1-11, 2014.
15 ANSYS FLUENT User Guide, Release 14.0, ANSYS, Inc., 2011.
16 Jeong, Y., Park, T., "THD analysis of surface textured parallel thrust bearing: Effect of dimple radius and depth", J. Korean Soc. Tribol. Lubr. Eng., Vol. 30, No. 5, pp. 303-310, 2014.   DOI
17 Meng, X., Khonsari, M. M. "On the effect of viscosity wedge in micro-textured parallel surfaces", Tribol. Int., Vol. 107, pp. 116-124, 2017.   DOI