DIFFUSION IN HETEROGENEOUS MEDIA - PROPERTIES OF A LAMINATED SLAB
DIFFUSION IN HETEROGENEOUS MEDIA - PROPERTIES OF A LAMINATED SLAB
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DOI：
10.1088/0508-3443/14/12/307
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发表时间：
1963-01-01
期刊：
影响因子：
--
通讯作者：
PETROPOULOS, JH
中科院分区：
文献类型：
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作者：
ASH, R;BARRER, RM;PETROPOULOS, JH
本文从理论上研究了通过交替相A和B的层状膜的扩散。在所考虑的层压板中，扩散系数在每个相中是恒定的，并且在每个相中扩散剂根据亨利定律溶解。对于固定的体积分数的每个组件的稳态通量垂直于层是独立的状态的细分的特点是对层压板A，B的数量n。在稳态的膜中的扩散剂的总量已被计算和用于定义膜的总扩散系数。的时间滞后L特性的瞬态，已被评估和它的一些属性的调查。特别感兴趣的是在一个相的体积分数的时间滞后的变化中观察到的最大值。只有在介质中，其中n是大的稳态和时滞方法给出相同的总扩散系数。还对时滞-渗透率乘积给予了一些关注。
A theoretical study has been made of diffusion through a laminated membrane in the form of sheets of alternating phases A and B. In the laminates considered the diffusion coefficients are constant in each phase and in each the diffusant dissolves according to Henry's law. For a fixed volume fraction of each component the steady-state flux normal to the laminae is independent of the state of sub-division characterized by the number n of pairs of laminates A, B. The total quantity of diffusant in the membrane in the steady state has been calculated and employed to define an overall diffusion coefficient for the membrane. The time lag L characteristic of the transient state, has been evaluated and some of its properties investigated. Particular interest attaches to a maximum observed in the variation of the time lag with the volume fraction of one phase. Only for media in which n is large do steady-state and time-lag methods give the same overall diffusion coefficient. Some attention has also been given to the time lag-permeability product.