Dryout mechanism of thin liquid film near a flow obstacle using substitute fluids which simulates the high pressure and temperature conditions

气液两相流动在许多工业中都遇到过，包括沸水反应堆燃料棒附近的流动。特别是水膜干燥发生在两个连续扰动波之间的薄基膜上。因此，弄清扰动波的详细行为是很重要的。在以往的研究中，许多实验都是在大气条件下进行的。然而，常压条件下液体和气体的性质与沸水堆运行条件（7MPa, 285C）有很大不同。因此，本研究选用与沸水堆工况性质相近的HFC134a气体和乙醇液体作为试验流体，试验流体为低压低温（0.7MPa,40℃）。本文报道了气液性质对液膜厚度的影响。

Gas-liquid two-phase flow is encountered in many industries, including flow near nuclear fuel rods in boiling water reactor(BWR). Especially dryout of water film occurs at the thin base film between two successive disturbance waves. Therefore, it is important to clarify the detailed behavior of the disturbance wave. In previous studies, many experiments were performed under atmospheric condition. However the properties of liquid and gas under atmospheric condition are quite different from those of a BWR operating condition(7MPa, 285C). Therefore, in the present study, HFC134a gas and ethanol liquid, whose properties are similar to those the BWR operating conditions are used as the test fluids at comparatively low pressure and low temperature (0.7MPa,40C). In this paper, the influence of gas-liquid properties on the liquid film thickness is reported.