沸騰による壁温変動の予測に関する基礎的検討

抄録

In this study, temporal fluctuation of the boiling heat transfer was simply modeled based on measurements, and unsteady heat conduction simulations were conducted using this model as a boundary condition. As a result, it was found that the wall surface temperature fluctuation varies significantly depending on the thermophysical properties of the heat transfer surface. It was also shown that the amplitude of the surface-averaged wall temperature fluctuation over a typical area varies inversely proportional to the thermal effusivity √cρλ. However, the simplified model of heat transfer fluctuation is used to predict local temperature fluctuations, the prediction accuracy is degraded due to thermal diffusion in the plane direction. Therefore, in order to improve the accuracy to predict local wall temperature fluctuations, it is necessary to properly model the surface distribution of heat transfer coefficient in addition to the temporal fluctuation.