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Impact of Pore Geometry and Water Saturation on Gas Effective Diffusion Coefficient in Soil
Hu, Wulong1; Jiang, Yao2,3; Chen, Daoyi4; Lin, Yongshui1; Han, Qiang4; Cui, Yifei5
通讯作者Jiang, Yao(yjiang@imde.ac.cn)
2018-11-01
发表期刊APPLIED SCIENCES-BASEL
ISSN2076-3417
卷号8期号:11页码:13
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
DOI10.3390/app8112097
收录类别SCI
关键词[WOS]POROUS-MEDIA ; MEMBRANE DISTILLATION ; VAPOR MOVEMENTS ; CARBON-DIOXIDE ; 2-PHASE FLOW ; TRANSPORT ; MODEL ; SIMULATIONS ; ADSORPTION ; AGGREGATE
语种英语
资助项目National Natural Science Foundation of China[11602180] ; National Natural Science Foundation of China[41790432] ; Fundamental Research Funds for the Central Universities[WUT: 2017IVA064] ; Fundamental Research Funds for the Central Universities[WUT: 2017IVB058] ; CAS Pioneer Hundred Talents Program
WOS研究方向Chemistry ; Materials Science ; Physics
WOS类目Chemistry, Multidisciplinary ; Materials Science, Multidisciplinary ; Physics, Applied
WOS记录号WOS:000451302800087
项目资助者National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; CAS Pioneer Hundred Talents Program
出版者MDPI
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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Jiang, Yao
作者单位1.Wuhan Univ Technol, Sch Sci, Hubei Key Lab Theory & Applicat Adv Mat Mech, Wuhan 430070, Hubei, Peoples R China
2.Chinese Acad Sci, Key Lab Mt Hazards & Earth Surface Proc, Inst Mt Hazards & Environm, Chengdu 610041, Sichuan, Peoples R China
3.Univ Chinese Acad Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China
4.Tsinghua Univ, Sch Environm Sci & Engn, Beijing 100084, Peoples R China
5.Hong Kong Univ Sci & Technol, Dept Civil & Environm Engn, Hong Kong 999077, Hong Kong, Peoples R China
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Hu, Wulong,Jiang, Yao,Chen, Daoyi,et al. Impact of Pore Geometry and Water Saturation on Gas Effective Diffusion Coefficient in Soil[J]. APPLIED SCIENCES-BASEL,2018,8(11):13.
APA Hu, Wulong,Jiang, Yao,Chen, Daoyi,Lin, Yongshui,Han, Qiang,&Cui, Yifei.(2018).Impact of Pore Geometry and Water Saturation on Gas Effective Diffusion Coefficient in Soil.APPLIED SCIENCES-BASEL,8(11),13.
MLA Hu, Wulong,et al."Impact of Pore Geometry and Water Saturation on Gas Effective Diffusion Coefficient in Soil".APPLIED SCIENCES-BASEL 8.11(2018):13.
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