The temperature and thickness of oil film in point EHL contacts between a rough stationary surface and a smooth moving surface are measured with infrared and optical interferometry techniques. The ridges and furrows of the roughness are aligned with the parallel direction to that of lubricant entrainment. The experimental results are compared with numerical simulations based on Eyring and Newtonian fluid flow models. Under certain conditions, the average film temperature across the oil film near the central contact region is higher at the furrow position than at the ridge position. It is revealed that this phenomenon is caused by shear thinning behavior of lubricant.

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