IMHE OpenIR  > 山地灾害与地表过程重点实验室
Impact of Pore Geometry and Water Saturation on Gas Effective Diffusion Coefficient in Soil
Wulong Hu1; Yao Jiang2,3; Daoyi Chen4; Yongshui Lin1; Qiang Han4; Yifei Cui5
2018-12
发表期刊Applied Sciences
ISSN2076-3417
页码2097
摘要

Gas flow in soil plays a crucial role in terrestrial ecosystems, and numerical simulation of their movement needs to know their effective diffusion coefficients. How pore structure influences the effective diffusion coefficient has been studied intensively for dry porous media, but much remains unknown for unsaturated soils. Here, we employed the X-ray tomography technique at the pore scale to directly obtain the soil structures, the geometry of their pores and the water distribution under different water saturation levels were calculated using a morphological model. The results show that pore structures including porosity, interface area of gas–solid–water and pore diameter are closely related to water saturation. The increase of mean pore diameter with gas saturation can be fitted into a power law. We also investigated the impact of pore geometry and water saturation on the effective diffusion coefficients, which is independent of the molecular mass of gas after normalization. As the normalized effective Knudsen diffusion coefficient increases with average pore diameter following a power law, with the scaling factor related to pore geometry and the exponent is a constant, we explained and proved that the Knudsen diffusion coefficient increases with gas saturation, also following a power law.

关键词Pore-scale Modelling Effective Diffusion Coefficient Knudsen Diffusion Pore Structure Water Saturation Unsaturated Soil
收录类别SCI
语种英语
期刊分区3区
文献类型期刊论文
条目标识符http://ir.imde.ac.cn/handle/131551/24297
专题山地灾害与地表过程重点实验室
通讯作者Yao Jiang
作者单位1.Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics, School of Science, Wuhan University of Technology, Wuhan 430070, China
2.Key Laboratory of Mountain Hazards and Earth Surface Processes, CAS/Institute of Mountain Hazards and Environment, CAS, Chengdu 610041, China
3.University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing 100049, China
4.School of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China;
5.Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong SAR 999077, China
通讯作者单位中国科学院水利部成都山地灾害与环境研究所
推荐引用方式
GB/T 7714
Wulong Hu,Yao Jiang,Daoyi Chen,et al. Impact of Pore Geometry and Water Saturation on Gas Effective Diffusion Coefficient in Soil[J]. Applied Sciences,2018:2097.
APA Wulong Hu,Yao Jiang,Daoyi Chen,Yongshui Lin,Qiang Han,&Yifei Cui.(2018).Impact of Pore Geometry and Water Saturation on Gas Effective Diffusion Coefficient in Soil.Applied Sciences,2097.
MLA Wulong Hu,et al."Impact of Pore Geometry and Water Saturation on Gas Effective Diffusion Coefficient in Soil".Applied Sciences (2018):2097.
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