A diffusion-viscous flow model for simulating shale gas transport in nano-pores
摘要:A model for gas flow in nano-pores was developed based on the extended Navier-Stokes equations with the assumption of neglecting adsorption and desorption. The model describes multiple flow regimes, including continuum regime, slip flow regime, transition regime, as well as molecular regime. The total mass flux includes a convective motion term and a diffusion mass transport term. The latter was obtained as a weighted superposition of bulk and Knudsen diffusion. The mass flux, contributed by different transport mechanisms, was analyzed by varying the Knudsen number (ratio between mean free path of the molecules and the pore diameter). The effect of the ratio coefficient (the power-law exponent in the relation between bulk and Knudsen diffusion), the pore size and the pressure on the gas transport was investigated using the proposed model. The predictions of the newly developed model are in good agreement with the Direct Simulation Monte Carlo (DSMC) method and with the results of the experiments. Our results show that: (1) As the Knudsen number increases, the contribution of viscous flow to gas transport decreases monotonically, bulk diffusion increases to a peak, and then decreases, whereas the Knudsen diffusion increases monotonically. (2) For a larger ratio coefficient, the bulk diffusion changes more rapidly and the peak is higher. The changing trend of the bulk diffusion is opposite to the Knudsen diffusion. (3) The pressure range in which the viscous flow dominates becomes larger and the peak of bulk diffusion is smaller in larger pores. When the pore pressure is higher, the viscous flow and the bulk diffusion tend to dominate. (C) 2016 Published by Elsevier Ltd.
关键字:Shale gas Nano-pores Transport Bulk diffusion Knudsen diffusion
ISSN号:0016-2361
卷、期、页:卷: 181 页: 887-894
发表日期:2016-10-01
期刊分区(SCI为中科院分区):二区
收录情况:SCI(科学引文索引印刷版),ESI(基本科学指标数据库),EI(工程索引),SCIE(科学引文索引网络版)
发表期刊名称:FUEL
参与作者:Zitha, Pacelli
通讯作者:耿黎东,范鑫
第一作者:李根生,田守嶒,盛茂
论文类型:期刊论文
论文概要:耿黎东,李根生,Zitha, Pacelli,田守嶒,盛茂,范鑫,A diffusion-viscous flow model for simulating shale gas transport in nano-pores,FUEL,2016,卷: 181 页: 887-894
论文题目:A diffusion-viscous flow model for simulating shale gas transport in nano-pores