Hydrodynamic journal bearings can experience a significant variation in film (bush) temperature. Reliable data of operating temperatures in these bearings are very useful and important for practical bearing designers and mathematical modellers. A two-axial-groove circular bearing and an elliptical (lemon-bore) bearing, both 110 mm in diameter, have been tested at specific loads up to 4 MPa and rotational frequencies up to 120 Hz. Power loss and flow rate were measured directly and detailed temperature information was collected by an automated data acquisition system. In this paper, the experimental apparatus is described and some of the experimental data are presented. The results show that the thermal effects are significant in both bearings.
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