Laminar mixed convection flow in horizontal duct of rectangular shape has been investigated numerically for developing regions. The developing flow in the rectangular duct has been studied at Re=250 and Pr=0.7 for various aspect ratio and Gr combinations: for fixed aspect ratio (gamma) of 2, the Grashof number is varied from 2 X 10~4 to 5 X 10~4 and, for Gr fixed at 2 X 10~4, gamma is varied between 2 and 8. Irrespective of these conditions, it is found that the thermal instability evolves at the lower corners of the duct and is magnified by the unstable thermal condition across the entire bottom plate. This process results in longitudinal vortices driven by a plume ascending along the sidewall.
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机译：对于发育区域，已经对矩形水平管中的层流混合对流进行了数值研究。对于各种长宽比和Gr组合，已经研究了矩形风管中的显影流在Re = 250和Pr = 0.7的情况下：对于固定长宽比（γ）为2的情况，格拉斯霍夫数从2 X 10〜4到5 X不等10〜4，对于固定在2 X 10〜4的Gr，伽马在2到8之间变化。不管这些条件如何，都发现热不稳定性会在导管的下角处发展，并被不稳定的热放大。整个底板的状况。该过程导致由沿侧壁上升的羽流驱动的纵向涡流。
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