Tribology and Lubricants

Korean Tribology Society (한국트라이볼로지학회)
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Effect of Film-Temperature Boundary Conditions on the Lubrication Performance of Parallel Slider Bearing

유막온도경계조건이 평행 슬라이더 베어링의 윤활성능에 미치는 영향

  • Park, TaeJo (School of Mechanical Engineering, ERI, Gyeongsang National University) ;
  • Kim, MinGyu (Graduate School, School of Mechanical & Aerospace Engineering, Gyeongsang National University)
  • 박태조 (경상대학교 기계공학부.공학연구원) ;
  • 김민규 (경상대학교 대학원 기계항공공학부)
  • Received : 2017.08.30
  • Accepted : 2017.09.21
  • Published : 2017.10.31
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Abstract

In sliding bearings, viscous friction due to high shear acting on the bearing surface raises the oil temperature. One of the mechanisms responsible for generating the load-carrying capacity in parallel surfaces is known as the viscosity wedge effect. In this paper, we investigate the effect of film-temperature boundary conditions on the thermohydrodynamic (THD) lubrication of parallel slider bearings. For this purpose, the continuity equation, Navier-Stokes equation, and the energy equation with temperature-viscosity-density relations are numerically analyzed using the commercial computational fluid dynamics (CFD) code FLUENT. Two different film-temperature boundary conditions are adopted to investigate the pressure generation mechanism. The temperature and viscosity distributions in the film thickness and flow directions were obtained, and the factors related to the pressure generation in the equation of motion were examined in detail. It was confirmed that the temperature gradients in the film and flow directions contribute heavily to the thermal wedge effect, due to which parallel slider bearing can not only support a considerable load but also reduce the frictional force, and its effect is significantly changed with the film-temperature boundary conditions. The present results can be used as basic data for THD analysis of surface-textured sliding bearings; however, further studies on various film-temperature boundary conditions are required.

Keywords

References

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