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低雷诺数下矩形竖腔内混合对流的格子Boltzmann方法模拟

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Indexed by:会议论文

Date of Publication:2008-10-01

Key Words:格子Boltzmann法;混合对流;纵横比;矩形竖腔;低雷诺数;对流换热

Abstract:文中采用格子Boltzmann力矩模型模拟了不同纵横比(A)、瑞利数(Ra)、雷诺数(Re)下两维矩形腔内的混合流动。用Richardson数(Ri)衡量自然对流和强制对流模式对换热影响的相对程度。通过对模拟结果的分析,表明在低雷诺数下,当流动是强制对流占主导时,换热可看作矩形腔内上部强制对流换热cvuN加权该部分尺寸与下部导热cdNu加权下部导热尺寸的综合作用结果,得到整体换热强度随纵横比变化的经验公式,并给出其适用范围。

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