This study aims to analyze thermal heat-transfer between an oil jet and a rotating spur gear using a novel experimental methodology1 to have an analytical model based on lubrication conditions and geometric characteristics of spur gears. Based on existing theoretical formulations and advanced visualization techniques implemented on a test bench. The use of a high-speed image acquisition system allowed the identification of three distinct phases, depending on the gear rotational speed, which led to the development of the heat-transfer model. This research considers various types of spur gears to account for geometric variations and different lubrication conditions, namely different oil jet flow rates and/or nozzle diameters. These results provide a new perspective on understanding convective transfers in mechanical transmissions.
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