EFFECTIVE TRANSPORT-COEFFICIENTS IN HETEROGENEOUS MEDIA
EFFECTIVE TRANSPORT-COEFFICIENTS IN HETEROGENEOUS MEDIA
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DOI：
10.1016/0009-2509(87)80141-0
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发表时间：
1987-01-01
影响因子：
4.7
通讯作者：
EVANS, JW
中科院分区：
文献类型：
--
作者：
AKANNI, KA;EVANS, JW
本文强调了异质介质中一些传输现象的共性。通过对气体分子在多孔固体中的扩散进行蒙特卡罗模拟，说明了有效输运系数的计算。提出了多孔固体中分子运动的物理和随机描述，后者更为严格，并对扭曲的概念提出了不同的见解。蒙特卡罗模拟的结果与有效输运系数的经典预测一致。即使在导电相的低体积分数下，也保持了一致性，这超出了经典预测中所作假设的有效性限制。
The paper emphasizes the commonality of a number of trnasport phenomena in heterogeneous media. The computation of an effective transport coefficient is then illustrated by Monte Carlo simulation of the diffusion of a gas molecule in a porous solid. Both physical and stochastic descriptions of molecular motion in a porous solid are presented, the latter being more rigorous and presenting a different insight into the concept of tortuosity. The Monte Carlo simulations yielded results that are consistent with classical predictions for effective transport coefficients. The consistency was maintained even at low volume fractions of the conducting phase which are beyond the limit of validity of the assumptions made in classical predictions.