Convective heat and mass transfer. Single phase flow
Convective heat and mass transfer. Single phase flow
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对流传热和传质。
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
K. Stephan
中科院分区：
文献类型：
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作者：
H. Baehr;K. Stephan
该传质系数适用于对流消失的情况，但必须对有限对流进行修正。这些方程描述了对流传热和传质，但它们只不过是传热系数α和传质系数β的定义方程，不应被视为传热和传质的定律。相反，传热和传质过程的自然规律隐藏在传热和传质系数中。一般来说，两者都不是常数，而是局部变量，在瞬态过程中，它们也随时间变化。此外，它们还取决于流动、流体的性质以及传热或传质表面的几何形状。因此，上面给出的传热传质系数的定义方程不适合描述传热传质机理。这只有在对心流进行深入研究的情况下才有可能，这将是下面阐述的主题。
This mass transfer coefficient was valid for vanishing convective flows and had to be corrected for finite convective flows. These equations describe convective heat and mass transfer, but they are nothing more than definition equations for the heat transfer coefficient α and the mass transfer coefficient β, and should in no way be seen as laws for heat and mass transfer. Rather the laws of nature for the course of processes of heat and mass transfer are hidden in the heat and mass transfer coefficients. Generally both are not constant, but locally variable and in transient processes they also change with time. In addition they depend on the flow, the properties of the fluid and the geometry of the heat or mass transfer surfaces. Therefore, the definition equations for heat and mass transfer coefficients given above are not suitable for describing the mechanisms of heat and mass transfer. This is only possible with an in depth study of flow and will be the subject of the following exposition.