Tribology and Lubricants

  • 제33권6호
  • /
  • Pages.288-295
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  • 2017
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  • 2713-8011(pISSN)
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  • 2713-802X(eISSN)
한국트라이볼로지학회 (Korean Tribology Society)
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Surface Texturing한 평행 슬라이더 베어링의 열유체윤활 해석: 딤플 깊이의 영향

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

  • 박태조 (경상대학교 기계공학부.공학연구원) ;
  • 김민규 (경상대학교 대학원 기계항공공학부)
  • Park, TaeJo (School of Mechanical Engineering, ERI, Gyeongsang National University) ;
  • Kim, MinGyu (Graduate School, School of Mechanical & Aerospace Engineering, Gyeongsang National University)
  • 투고 : 2017.10.13
  • 심사 : 2017.11.28
  • 발행 : 2017.12.31
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초록

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.

키워드

참고문헌

  1. Etsion, I., "State of the art in laser surface texturing", ASME J. Tribol., Vol. 127, No. 1, pp. 248-253, 2005. https://doi.org/10.1115/1.1828070
  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. https://doi.org/10.1016/j.triboint.2015.10.009
  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. https://doi.org/10.9725/kstle.2011.27.6.302
  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. https://doi.org/10.9725/kstle.2011.27.6.338
  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. https://doi.org/10.3795/KSME-A.2013.37.4.437
  8. Cameron, A., "The viscosity wedge", ASLE Trans., Vol. 1, No. 2, pp. 248-253, 1958. https://doi.org/10.1080/05698195808972337
  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. https://doi.org/10.1115/1.3261317
  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. https://doi.org/10.1080/05698198708981725
  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. https://doi.org/10.1016/j.triboint.2009.05.021
  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. 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. https://doi.org/10.9725/kstle.2014.30.5.303
  16. Meng, X., Khonsari, M. M. "On the effect of viscosity wedge in micro-textured parallel surfaces", Tribol. Int., Vol. 107, pp. 116-124, 2017. https://doi.org/10.1016/j.triboint.2016.11.007
  17. ANSYS FLUENT User Guide, Release 14.0, ANSYS, Inc., 2011.