【摘要】 本文采用有限单元法求解涡量、流函数、能量和组分控制方程,数值模拟了在温度梯度和浓度梯度正交情况下竖直环形容器内的双扩散对流结构。通过改变浮升力比N=GrS／GrT和Le数的大小,分析了溶质浮升力方向及其大小和Le数对容器内双扩散对流的影响。结果表明:当溶质浮升力改变时,壁面处的流体流动状况、边界层厚度、Nu数和Sh数都发生了变化;随着Le数的增大,竖直壁面处Nu数逐渐降低而水平壁面处的Sh数逐渐增大。更多还原

【Abstract】 A numerical study is presented of the structure of double diffusive convection in an annual cavity with horizontal temperature and vertical solute gradients. The control equations are solved by finite element method. Numerical results are reported for the effect of buoyancy ratio N = GrS/GrT and the Le numbers on the characters of double-diffusive convection. The results show that the velocity of flow, the thickness of boundary layer, Nu number and Sh number all vary with different N; at the same time, Nu number decreases and Sh number increases when the Le number varies from 3 to 40.更多还原