Study on Accurate Prediction of Heat Transfer Characteristics of Mist Cooling : Effects of Surface Wettability

Abstract

In the present experiments, a transient method was used to study the heat transfer characteristics of mist cooling. The effects of surface wettability on the heat transfer coefficient and the minimum temperature of the high-temperature region, which corresponds to the film boiling region, were investigated. The heat transfer surface was made of aluminum and was 15mm in diameter and 2mm in thickness. The wettability of the heat transfer surface was varied by surface treatment. It was found that with higher surface wettability, the minimum temperature required is also higher. The experimental conditions of mist flow were as follows: the air velocity Va was 20m/s; the temperature of the water droplet Tl was 21°C; and the volumetric droplet flow rate D was in the range of 0.00057 to 0.00472m3/m2s.