抽吸式自然对流换热及扰流柱对其影响

EXTRACTIVE NATURAL CONVECTIVE HEAT TRANSFER AND EFFECT OF CROSS TUBES BETWEEN TWO PARALLEL PLATES

用稳态法进行了竖直平行平板间加扰流柱的抽吸式自然对流换热实验研究,全面考虑了包括辐射损失在内的各项修正,得到了精度不低于10％的经验公式。实验发现,对于不加扰流柱的平行平板通道,当温差大于50℃时,换热系数随间距的变化存在极值;小间距加扰流柱时,扰流柱对流动的阻滞起主要作用,换热系数低于无扰流柱时的值。

Experimental results on natural convective heat transfer from two isothermal vertical parallel plates and effect of cross tubes between these two plates are reported. Corrections including radiative loss are made. The extreme value of heat transfer coefficient exists for large temperature differences. The cross tubes hinder air flow and cause decrease in heat transfer coefficient at small spacings between two plates.