Measurements of Rewetting Temperatures of Hot Dry Surface in Saturated and Subcooled Film Boiling

The behavior of rewetting on a high superheated and dry surface, focusing on rewetting temperature just as collapse of saturated and subcooled film boiling was investigated experimentally by using a commercial separated-type infrared thermometer. Saturated and subcooled impingement jet experiments were conducted by using a silicon wafer with 20 mm length, 20 mm width and 0.5 mm thickness and pure water at atmospheric condition. Temperature of the test heater was measured by using a commercial separated-type infrared thermometer from a back side of it. The present experimental results showed that as the liquid subcooling was high, Minimum Heat Flux temperature (i.e., Minimum Film Boiling, rewetting temperature or quenching temperature) was higher. Furthermore, the effect of the rewetting temperature on liquid subcooling was similar to that of Dhir-Purohit’s correlation quantitatively.