有阻流件的二维封闭方腔自然对流数值研究

利用自然对流物理模型,采用SIMPLE算法,对流扩散项采用二阶迎风格式.计算研究了有水平等温阻流件的二维封闭方腔中空气的自然对流换热.得出了在一定的Ra下,具有不同长度的阻流件的平均Nu数.有水平阻流件的封闭方腔与无阻流件时相比,相同条件下自然对流的换热系数随阻流件长度的增加先略减少,然后增加.而且随着阻流件长度变化,在方腔内的环流由一个增加到两个和三个.同时阻流件布置在不同壁面上的布置方式对换热强度也有一定影响.

Numerical Study on Natural Convection in Square Cavity with Isothermal Baffles

The natural convection of the two - dimensional square cavity with horizontal isothermal baffles is studied. The government equation was solved by SIMPLE algorithm with second upwind scheme. The average Nu number in the Rayleigh numbers is obtained on the various length of the baffles, and then compared and analyzed the heat transfer of natural convection when there are not baffles on the wall. Under the same condition, with the baffles longer, the Nu number of natural convection in the square cavity decreases at first, then gradually increases. It has only one vortex at first, then becomes two or three vortexs when the baffles get longer. There are some effects when the baffles locate in different ways.