Tribology and Lubricants

Korean Tribology Society (한국트라이볼로지학회)
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Thermohydrodynamic Analysis Considering Flow Field Patterns Between Roughness Surfaces

미세 표면 거칠기에 지배되는 박막 유동장 형태를 고려한 윤활거동

  • 김준현 (국민대학교 기계 자동차공학부) ;
  • 김주현 (국민대학교 기계 자동차공학부)
  • Published : 2003.06.01
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Abstract

The study deals with the development of a thermohydrodynamic (THD) computational procedure for evaluating the pressure, temperature and velocity distributions in fluid films with very rough geometry. A parametric investigation is performed to predict the bearing behaviors in the lubricating film having the absorbed layers and their interfaces determined by the rough surfaces with Gaussian distribution. The layers are expressed as functions of the standard deviations of each surface to characterize flow patterns between both the rough sur-faces. The velocity variations and the heat generation are assumed to occur in the central (shear) zone with the same bearing length and width. The coupled effect of surface roughness and shear zone dependency on hydrodynamic pressure and temperature has been found in non-contact mode. The procedure confirms the numerically determined relationship between the pressure and film gap on condition that its roughness magnitude is smaller than the fluid film thickness.

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References

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