圧力波付加時の膜沸騰蒸気膜の不安定挙動および蒸気膜内圧力変動の測定と解析

抄録

Destabilization process of the vapor film formed around a hemispherical heated surface made of copper or stainless steel rod of 30 mm in diameter and immersed in R 113 is investigated experimentally. The vapor film is destabilized by an external pressure wave, which is produced by a magnetic hammer, and the configuration is taken photographes. The pressure change in the vapor film when the external pressure wave is supplied is measured by a small pressure transducer set at the stagnation point of the copper rod. The induced pressure change in the film is analyzed theoretically and is shown to be in good agreement with measured data. A sharp pressure pulse, which has a higher peak value than that of supplied external wave, is confirmed to generate in the vapor film. The maximum pressure in the vapor film is in proportion to 1.6 power of that of the external pressure wave.