Influence Of Thermal Shear Localization On
Elastohydrodynamic Contacts
Author(s)
R. Guilbault
Abstract
The temperature in elastohydrodynamic contacts determines the resistance of the
lubricant film. Therefore, an efficient assessment of the scuffing risks requires
accurate contact temperature prediction. The work presented in this paper makes
use of a simple temperature model to investigate the influence of thermal shear
localization on the temperature distribution in lubricant films. The model
incorporates a multilayer lubricant film representation for the heat equation
solution. The paper includes an original heat repartition factor expression and a
simple formula for handling intermediate values of the Peclet number. The study
also integrates an inlet temperature rise equation. The temperature predictions for
sliding/rolling conditions are compared to published numerical results neglecting
the shear localization influence. The results agree remarkably well; for the
evaluations presenting the higher absolute difference, the correspondence
remained over 94% and 95% for the maximum and mean temperatures,
respectively. For the tested conditions, subsequent inclusion of the thermal shear
localization contribution reveals that the shear localization augments the mean
film temperature, while, depending on the pressure, the shearing zone occupies
between 50 to 70% of the film thickness.
Keywords: elastohydrodynamic, temperature, inlet temperature, heat repartition.
Keywords
elastohydrodynamic, temperature, inlet temperature, heat repartition
Related Book
Other papers in this volume
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