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首页> 外文期刊>Physical review, E. Statistical physics, plasmas, fluids, and related interdisciplinary topics >Fluid diffusion through a porous solid: Nonequilibrium molecular-dynamics simulation
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Fluid diffusion through a porous solid: Nonequilibrium molecular-dynamics simulation

机译:通过多孔固体的流体扩散:非平衡分子动力学模拟

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摘要

Fluid mass transport through a porous solid is studied by carrying out nonequilibrium molecular-dynamics simulations for a simple model. It is found that through the porous solid, the steady state density distribution is not linear, even in the case of a quite small current. Hence, Fick's law cannot be applied simply. Nevertheless, the density distribution is piecewise linear. An adequate interpretation can be made by applying Fick's law piecewise with different diffusion coefficients in different regions. Thus a distinct diffusion coefficient can be unambiguously defined for the interfacial region, which can be seven times smaller than the diffusion coefficient in the interior of the porous solid. So the surface crossing is a limiting step in the overall process of mass transport through a porous solid.
机译:通过对简单模型进行非平衡分子动力学模拟,研究了通过多孔固体的流体传质。发现即使在电流很小的情况下,通过多孔固体的稳态密度分布也不是线性的。因此,菲克定律不能简单地应用。然而,密度分布是分段线性的。可以通过在不同区域中采用不同扩散系数的菲克定律分段应用适当的解释。因此,可以明确地为界面区域定义不同的扩散系数,该扩散系数可以比多孔固体内部的扩散系数小七倍。因此,表面穿越是通过多孔固体进行整体传输的整个过程中的一个限制步骤。

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