大间矩平行竖板通道自然对流换热的计算研究

Computational Investigation of Natural Convective Heat Transfer in A Vertical Parallel Plates Channel with Large Interplates Spacing and Opened Edges

对两端开口的,间距为b=0.015m～0.04m,高度L=0.3～6.0m的竖直平行板通道的自然对流换热进行了计算研究,计算的R_a(D_h/L)值为110～270000,采用数值解的方法,解出质量、动量、能量微分方程,从而求得通道内的速度场、温度场、质量流率,并进一步研究了对流、辐射换热量及总传热系数,研究表明,在一定范围内,通道内自然对流的R_a(D_h/L)数的增大,对于其流速及温度分布有明显影响,在其他条件相同时,增大通道宽度b对于表征其总传热损失的总传热系数亦有所影响。

Natural convective heat transfer in a vertical parallel plates channel with large large and opened edges was investigated numerically.The computational work encompassed,the width of the channel from 0.015m,the height of the channel from 0.3m to 6.0m.the Ra(Dh/L) value from 110 to 270,000.The heat transfer results were obtained by numerically solving the equations of mass,momentum,and energy for the physical model given.It was found that the width of the channel has an important infleuence to the flow model.An analysis has been performedto determine the heat flux of convective,radiative,and overall heat tran' sfer,and heat loss through the channel.