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Measurements were made to investigate the local behavior of recovery factor and heattransfer coefficient with free-surface circular jets. The experiments were performed withtransfer oil jets impinging on vertical constantuheat-flux surface from small pipe and orificenozzles of 1 mm diameter in the range of Re = 184 ～1920 and Pr = 120～ 400. Radialdistribution of recover factor was determined Heat transfer coefficient at stagnation pointfound to be independent of nozzle-to-plate spacing, but proportional to square root of jetReynolds number. Profiles of local heat transfer coefficients were obtained and correlated.
Measurements were made to investigate the local behavior of recovery factor and heattransfer coefficient with free-surface circular jets. The experiments were performed with transfer oil jets impinging on vertical constant temperature-flux surface from small pipe and orificenozzles of 1 mm diameter in the range of Re = 184 to 1920 and Pr = 120 to 400. Radialdistribution of recover factor was determined Heat transfer coefficient at stagnation pointfound to be independent of nozzle-to-plate spacing, but proportional to square root of jet Reynolds number. Profiles of local heat transfer relations were and correlated.