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Suitability of the first-order mass transfer concept for describing cyclic diffusive mass transfer in stagnant zones

机译:一阶传质概念在停滞区内描述循环扩散传质的适用性

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摘要

The concept of first-order mass transfer between mobile and immobile regions, which mathematically simplifies the concept of Fickian diffusion in stagnant areas, has often been used to describe physical nonequilibrium transport of solutes into natural porous media. This study compares the two concepts, using analytical expressions describing cyclic mass transfer into and out of stagnant layers. The results show that the first-order mass transfer concept cannot describe continuous diffusion into the immobile zone during period of net inward diffusion if the immobile zone has not filled completely during the period of net inward diffusion.
机译:流动区域和非流动区域之间的一阶质量转移的概念在数学上简化了停滞区域中Fickian扩散的概念,通常被用来描述溶质向天然多孔介质的物理非平衡迁移。这项研究使用描述循环质量传入和传出停滞层的解析表达式,比较了这两个概念。结果表明,如果净向内扩散期间固定区未完全充满,则一阶传质概念无法描述净向内扩散期间向固定区的连续扩散。

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