Numerical simulation was carried out on the heat transfer characteristics in a mist/air impinging single slot jet. The effects of phase-changing heat transfer of the water droplets

the mist mass ratio in the air and the geometrical parameters of the slot jet were studied to reveal the enhancement of heat transfer. The simulated results show that adding liquid droplets in an air flow enhances the cooling effect drastically. 90% cooling enhancement at the stagnation point was achieved by injecting 5% of droplets with the heat flux of 8000W/m2. When the mist/air mass ratio increases from 1% to 5%

the heat transfer enhancement of the stagnation region is 32%. Proper jet width and impinging height are important parameters for cooling effect. In this study

the best impinging cooling effect was achieved with the impinging height to jet width ratio of 4.55 .