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.
出处
《热科学与技术》
CAS
CSCD
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)
关键词
热毛细对流
数值模拟
临界条件
振荡
thermocapillary convection
numerical simulation
critical conditions
oscillation
