An experimental comparison of liquid jet array and spray impingement cooling in the non-boiling regime

Abstract Liquid jet and spray impingement cooling were studied experimentally and compared in the non-boiling regime. In keeping with previous studies, jet heat transfer was confirmed to be dependent on the number and velocity of the impinging jets. For the commercial nozzle and experimental conditions used in the present study, spray cooling demonstrated a strong dependence on mass flux and it was proposed that droplet velocity also affects the heat transfer. However, further study is required to verify and quantify this effect. The comparison of the two cooling techniques revealed that spray cooling can provide the same heat transfer coefficient as jets at a substantially lower mass flux. It was proposed that the more effective cooling of non-boiling sprays was due primarily to the unsteady boundary layer resulting from droplet impact, and secondarily from evaporative cooling.

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