开口圆形浅池内低P r流体的热毛细对流  

Thermocapillary convection of low Prandtl number fluid in shallow cylindrical pool

作　　者：李友荣[1] 凌芳[1] 彭岚[1] 吴双应[1] 

机构地区：[1]重庆大学动力工程学院,重庆400044

出　　处：《热科学与技术》2007年第1期45-50,共6页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目(50476042)

摘　　要：为了了解开口圆形浅池内低Pr流体的热毛细对流基本规律,利用有限差分法进行了三维直接数值模拟。结果表明,当侧壁温度不均匀性较小时,流动为稳定的三维流动。当温度不均匀性超过某一临界值后,流动将转化为振荡的三维流动,为此,确定了流动转化的临界条件,分析了三维振荡热毛细对流的基本特性。发现在自由表面Marangoni效应作用下,冷壁附近温度和速度波动的滞后是引起三维振荡流动的主要原因。In order to understand the characteristics of thermocapillary convection, a series of unsteady three-dimensional numerical simulations of thermocapillary convection of low Prandtl number fluid in a shallow cylindrical pool, with an azimuthal temperature non-uniform, an adiabatic solid bottom and free surface, were conducted. The simulation results indicate that thermocapillary convection is steady three-dimensional flow at the small temperature non-uniform. When temperature non-uniform number exceeds some critical value, the flow will undergo a transition to three-dimensional oscillatory flow. The critical conditions for the flow transition were determined. Details of the flow and temperature fields were discussed, and oscillation frequencies were also exhibited.

关 键 词：热毛细对流 数值模拟 临界条件 振荡 

分 类 号：TK124[动力工程及工程热物理—工程热物理]