Abstract: Wicke-Kallenbach steady state diffusion experiment of binary and ternary diffusions of ethylene,argon and carbon dioxide were carried out in two kinds of alumina.The flux equations were established based on the dusty-gas model and Stefan-Maxwell equation and used to interpret the experiment data.The effective diffusivities for binary diffusion and pseudo binary effective diffusivities for ternary diffusion were obtained.At the meantime,the basic condition was derived to treat the effective diffusivities as constant for isothermal binary transient diffusion,which is identical with the experiment results.However,for ternary diffusion the pseudo-binary effective diffusivities can not be taken as invariable.In addition,for each alumina there is almost the same tortuosity no matter whether binary or ternary diffusion is,so tortuosity is a parameter that has a close relationship with the structure of porous media.

摘要： 在两种氧化铝中 ,分别采用C₂H₄ 、Ar和CO₂ 进行了两组分和三组分的Wicke -Kallenbach定态扩散实验 .由尘气模型和Stefan -Maxwell方程建立起的扩散通量方程 ,对实验结果加以处理 ,得到了两组分扩散的有效扩散系数及三组分扩散的虚拟两组分有效扩散系数 .同时 ,针对过渡区扩散推出了等温下两组分扩散的有效扩散系数为常数应满足的基本条件 ,所得结论和实验结果相吻合 .而对三组分扩散中的虚拟两组分有效扩散系数不能按照常数处理 .此外 ,无论是两组分或三组分扩散 ,对每一种氧化铝而言 ,有着相近的曲折因子 ,从而证实了曲折因子是与多孔介质结构密切相关的参数