本文对均匀与非均匀热流密度条件下、压力10 MPa时的过热水蒸气在抛物槽式太阳能集热管管内充分发展段的混合对流换热过程进行了数值模拟.结果发现,在非均匀热流密度条件下,与纯强制对流换热相比:层流时,混合对流换热的阻力系数增加21％～133％,Nu提高48％～261％;湍流时,混合对流换热的阻力系数增加7％～236％,Nu提高6％～150％.特别是相比于均匀热流边界条件,非均匀热流边界条件下浮升力对流动传热的影响更为显著,传统的对于混合对流的判定标准需要修正.
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