Abstract

This paper analyses the thermal and roughness effects on different characteristics of long porous slider bearings numerically. The roughness is assumed to be stochastic, Gaussian randomly distributed, and viscosity is assumed to be temperature dependent. The cases of one-dimensional longitudinal and transverse roughness are considered. The irregular domain of the fluid due to roughness is mapped to a regular domain so that the numerical method can be easily applied. It is shown that the combined effect has a significant influence on the performance of the bearing. The impact of the influence depends on the type of roughness and the permeability of the porous matrix. For transverse roughness model it is seen that the combined effect enhanced the load carrying capacity when compared to that of thermal effect on smooth surface, and the opposite is true for longitudinal roughness. However, the load capacity of the bearing is decreased due to the combined effect compared to that of roughness effect for both types of roughness models.

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