An inclined jet impinging on a pin fin heat sink is proposed and investigated experimentally. To investigate a flow the pattern, flow visualization using fluorescence and particle image velocimetry(PIV) velocity measurement are conducted with water. The jet impinges over a wide span of the heat sink with a large recirculation in the upper free space and occasionally with another smaller one in the corner. Further thermal experimentation is conducted using air to obtain temperature profiles in the air using a thermocouple rake and on the heat sink back plate using a thermal tracer camera, with impinging angles of 35˚, 45˚, and 55˚. The Reynolds number range based on nozzle slot is varied from 1507 to 6405. The results show that impinging angle of 55˚ degree show the heat transfer capability. The results of the thermal experiment is compared and discussed with those of the flow visualization.
