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Two dimensional mass transfer in flat layers and lateral diffusion effect in permeability determination

机译:平坦层中的二维传质和渗透率测定中的横向扩散效应

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摘要

For investigation of diffusion, such experimental setup geometry arrangement is preferred, where as soon as possible homogeneous concentration field takes place in flat material samples. However, lateral mass transfer may play significant role. Here, this effect was solved for twodimensional diffusion through a layer of finite thickness to a circular target with an insulating ring. Simple formula has been suggested fitting the numerical results in a wide range of variables including asymptotic cases as well. The formula is suitable for determination of permeability using data received by electrodiffusion measurement under the conditions of limiting diffusion current to a circular electrode with a guard ring.
机译:为了研究扩散,优选这种实验设置的几何布置,其中尽快在平坦的材料样本中发生均匀的浓度场。但是,横向传质可能起重要作用。在此,解决了通过有限厚度的二维扩散到带有绝缘环的圆形靶的二维扩散的影响。已经提出了一个简单的公式,可以将数值结果与包括渐近情况在内的各种变量进行拟合。该公式适用于在将扩散电流限制为带有保护环的圆形电极的条件下,使用通过电扩散测量接收到的数据来确定磁导率。

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