NUMERICAL STUDY OF ROTATION EFFECTS ON MICROCHANNEL FLOW AND HEAT-TRANSFER PERFORMANCE

The use of microchannels is one of the most promising and investigated routes for removing the high heat concentrations generated by avionic electronic circuits. Modern aircraft with high maneuverability are always subject to severe acceleration, so various dynamic characteristics of the coolant greatly affect the flow and heat-transfer performance in microchannels. To evaluate these influences, microchannels with various aspect ratios have been modeled numerically under conditions of acceleration. The three-dimensional governing equations for mass, momentum, and energy have been solved using an implicit finite-volume scheme. The results show that the flow and heat-transfer performance in microchannels is affected by the flow state, force state, and channel geometry parameters. These make heat-transfer characteristics in microchannels a complicated issue in an acceleration environment.