An experimental investigation was performed to study the effects of the spray coverage area, the film area, and the impact droplet velocity on the thermal performance of a spray cooling system. All experiments were carried out in a closed loop spray cooling system working with deionized water as a cooling medium. A plain copper surface with a diameter of 15 mm was used as a target surface and tested in the single-phase and twophase regimes. The coolant mass flux was 15.5 kg/s.m 2 , and the

more »

... nce between the nozzle and the heated surface was varied from 10 to16 mm. Due to the change in the nozzle height, the spray coverage area, the film area, and the droplet impact velocity were changed and affected the thermal performance of the spray cooling system. As a sequence of these changes, the experimental results showed that these parameters have a significant effect on the heat transfer characteristics.