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确定对流传质系数的膜渗模型

, PP. 26-29

Keywords: 对流传质,传质系数,膜渗模型,扩散系数

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Abstract:

针对对流传质过程研究中两个具有代表性的模型理论――薄膜模型理论和渗透模型理论确定的对流传质系数与实验结果存在一定不一致的问题,在分析薄膜模型理论和渗透模型理论特点的基础上,基于边界层理论,提出了确定对流传质系数的膜渗模型.讨论了该模型理论的原理、对流传质系数的确定方法及系数的正确性、优越性,获得了利用膜渗模型确定的对流传质系数表达式,并与遵循薄膜模型理论、渗透模型理论及Frossling经验公式的对流传质系数进行了比较.结果表明膜渗模型更符合边界层理论,能更合理的解释流动边界上的对流传质过程;对流传质系数与扩散系数的关系为Dn(n=0.5~1.0),符合经验公式及实际中大量实验结果.

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