【摘要】 为了了解微重力下水平温度梯度作用时环形浅液池内的热毛细对流特性,利用有限差分法进行了非稳态二维数值模拟,环形液池外壁被加热,内壁被冷却,流体为 0.65 cSt的硅油,其Pr 数为 6.7。结果表明,当温度梯度较小时,流动为稳态流动,随着温度梯度的增加,流动将会失去其稳定性,转化成各种振荡流动,模拟结果与实验结果基本吻合。更多还原

【Abstract】 In order to understand the nature of thermocapillary convection under microgravity ina differentially heated annular pool with the outer heated cylinder and the inner cooled cylinder, weconducted a series of unsteady two-dimensional numerical simulations with the finite volume method.The pool was filled with the 0.65 cSt silicone oil (Prandtl number Pr=6.7). Results showed that theflow is stable at the small temperature difference in the radial direction. With the increasing of thetemperature difference, the simulation can predict oscillatory thermocapillary flows. It is found thatthere is a good agreement between the simulation and experiment results.更多还原