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
Hu, Wulong1; Jiang, Yao2,3; Chen, Daoyi4; Lin, Yongshui1; Han, Qiang4; Cui, Yifei5
Corresponding AuthorJiang, Yao(yjiang@imde.ac.cn)
2018-11-01
Source PublicationAPPLIED SCIENCES-BASEL
ISSN2076-3417
Volume8Issue:11Pages:13
AbstractGas 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.
Keywordpore-scale modelling effective diffusion coefficient Knudsen diffusion pore structure water saturation unsaturated soil
DOI10.3390/app8112097
Indexed BySCI
WOS KeywordPOROUS-MEDIA ; MEMBRANE DISTILLATION ; VAPOR MOVEMENTS ; CARBON-DIOXIDE ; 2-PHASE FLOW ; TRANSPORT ; MODEL ; SIMULATIONS ; ADSORPTION ; AGGREGATE
Language英语
Funding ProjectNational 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 Research AreaChemistry ; Materials Science ; Physics
WOS SubjectChemistry, Multidisciplinary ; Materials Science, Multidisciplinary ; Physics, Applied
WOS IDWOS:000451302800087
Funding OrganizationNational Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; CAS Pioneer Hundred Talents Program
PublisherMDPI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/24297
Collection山地灾害与地表过程重点实验室
Corresponding AuthorJiang, Yao
Affiliation1.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
Recommended Citation
GB/T 7714
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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