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Composition at the interface between multicomponent nonequilibriumfluid phases

机译:多组分非平衡流体相之间界面的组成

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摘要

The computation of mass transfer between two nonequilibrium phases requires interfacialcomposition. For a system with a total of M components, the assumption of local thermodynamicequilibrium provides only M equations while the number of unknown interfacial compositions is2(M –1). In binary systems (M =2), the number of equations matches the number of unknowns andthe interfacial composition is readily computed at any temperature and pressure. In multicomponentsystems (M 3), the number of unknowns exceeds the number of equations and additionalconstraints are required. To the best of our knowledge, a general solution to the problem ofcomputing interfacial composition in multicomponent systems has not been presented in the past,despite its fundamental importance. In this work we present a general and consistent method ofcomputing interfacial composition where the additional constraints are obtained from mass balanceacross the interface. The derivations reveal that in multicomponent systems interfacial compositiondepends on the diffusion coefficients in the two bulk phases. This is a fundamental difference frombinary systems. The differences are demonstrated by comparing examples of mixing ofnonequilibrium phases in binary and ternary (M=3) systems.
机译:计算两个非平衡相之间的传质需要界面组成。对于具有总共M个组件的系统,局部热力学平衡的假设仅提供M个方程,而未知界面组成的数量为2(M –1)。在二元系统(M = 2)中,方程式的数量与未知数的数量匹配,并且在任何温度和压力下都可以轻松地计算界面组成。在多组件系统(M 3)中,未知数超过方程式数,并且需要附加约束。据我们所知,尽管它具有根本的重要性,但过去并未提出解决多组分系统中界面组成问题的一般解决方案。在这项工作中,我们提出了一种计算界面组成的通用且一致的方法,其中附加约束是从整个界面的质量平衡中获得的。推导表明,在多组分系统中,界面组成取决于两个本体相中的扩散系数。这是与二进制系统的根本区别。通过比较二元和三元(M = 3)系统中非平衡相混合的示例,可以证明差异。

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