FORMULATION OF A DUSTY GAS MODEL FOR MULTI-COMPONENT DIFFUSION IN THE GAS PHASE OF SOIL

SOILS AND FOUNDATIONS

YOSHIHIKO HIBI¹ 

[1] Department of Environmental Science and Technology, Faculty of Science and Technology, Meijo University

关键词: dusty gas model;    finite element method;    multi-component diffusion;    numerical analysis;    unsaturated soil;    (IGC: E13);   

DOI  :  10.3208/sandf.48.419

学科分类：建筑学

来源: Japanese Geotechnical Society / Jiban Kogakkai

【 摘 要 】

References(29)Cited-By(1)Soil vapor extraction and bio-venting have been utilized for purification of contaminated soil or groundwater. It is necessary to predict the movement of gas phase components in soil for the design of soil vapor extraction and bio-venting systems. Though chemical substances migrate with advection and diffusion in gas phase of soil, we investigated multi-component diffusion systems in gas phase of soil. Numerical modeling for multi-component diffusion is useful to the prediction of the movement of components. A dusty gas model for multi-component diffusion systems has not so far been formulated by the Finite Element Method; furthermore it has not been applied for assessing the movement of components in the gas phase of soil. Accordingly, a dusty gas model for three gas phase components was formulated by the Finite Element Method in this study, and the concentrations of components in binary and multi-component gas systems were calculated by numerical methods developed in this study. As a result, it was found that the dusty gas model must be applied for study of diffusion in a multi-component gas system; and the study showed that the difference between molecular weights of gas phase components influenced the movement of components in the gas system.

【 授权许可】

Unknown