Experimental investigation of internal channel cooling via jet impingement

In this paper, two heat transfer configurations (central-jet and side-jet) of jet impinging on a semicircular surface are experimentally studied.The internal channel is formed using flat insulated wall and a semi-circular surface using a curved flexible heater with a uniform heat flux. A set ofexperiments have been performed for the purpose of assessing the heat augmentation and pressure drop between the two jet configurations. The measurements include the inlet and outlet flow temperatures using thermocouples, thetemperature map of the flexible heater using thermal infra-red camera, the flow rates using rotary meter and pressure drop using pressure transducer. The study covers a jet flow Reynolds Numbers of 500 to 5000. The heat transfer is estimated by calculating the average and local heat transfer coefficient under constant wall heat flux condition and the pumping pressure is estimated by measuring the pressure drop between the inlet and outlet. The results indicate that central-jet impingement shows a 50% improvement in heattransfer with minimal difference in pumping pressure compared to the side-jet for the same range of Reynolds numbers.