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author:

Ding, Hao (Ding, Hao.) [1] | Wang, Jianqi (Wang, Jianqi.) [2] | Zhang, Yunzhao (Zhang, Yunzhao.) [3] | Yan, Huaxiang (Yan, Huaxiang.) [4] (Scholars:严华祥)

Indexed by:

EI Scopus SCIE

Abstract:

Understanding of heat and mass transfer in fractured porous media is vital for the effective analysis and management of subsurface systems. We have developed a transient analytical model that incorporates advection, diffusion, degradation, and adsorption processes of organic contaminants in fractured porous media under nonisothermal conditions. The solution is obtained through Laplace inversion. The analytical model is validated using experimental data, field test, and numerical solution. We investigate the influence of various factors, including thermal properties, flow conditions, and fracture characteristics on organic contaminants transport in fractured porous media. Our findings show that when the temperature at the inlet exceeds the initial temperature of the matrix, contaminant transport into the matrix is enhanced due to the thermal gradient. In contrast, contaminant transport in the fractures is comparatively impeded. For example, the contaminant flux for the case with a temperature difference (Delta T) of -15 K at the fracture outlet is 1.8 times greater than that observed at Delta T = 20 K. Accurate prediction of contaminant transport requires consideration of non-isothermal diffusion, especially in the case involving elevated ST and |Delta T|. The contaminant flux at the fracture outlet for the case with Delta T = 20 K is 68.24 % of the value without considering thermal diffusion effects. Increasing the adsorption capacity of the matrix (Rm) reduces the diffusive mass into the matrix from the fracture, while an increase in half-life of organic contaminant (t1/2,m) significantly increases the mass flux at the outlet. Increasing t1/2,m from 1 year to 200 years results in a rise of the outlet flux by factors of 82.3 and 70.4 for the case with Rm = 10 and Rm = 80, respectively. When the fracture aperture reaches a threshold value (e.g., 7 mm), the mass transfer at the interface between the fracture and matrix becomes negligible compared to the dominant flow within the fracture.

Keyword:

Analytical solution Fractured porous media Organic contaminant Thermal diffusion Transport

Community:

  • [ 1 ] [Ding, Hao]Zhejiang Univ, Coll Civil Engn & Architecture, Hangzhou 310058, Peoples R China
  • [ 2 ] [Wang, Jianqi]Zhejiang Univ, Coll Civil Engn & Architecture, Hangzhou 310058, Peoples R China
  • [ 3 ] [Zhang, Yunzhao]Fuzhou Univ, Zijin Sch Geol & Min, Fuzhou 350108, Peoples R China
  • [ 4 ] [Yan, Huaxiang]Fuzhou Univ, Zijin Sch Geol & Min, Fuzhou 350108, Peoples R China
  • [ 5 ] [Ding, Hao]Zhejiang Univ, MOE Key Lab Soft Soils & Geoenvironm Engn, Hangzhou 310058, Peoples R China
  • [ 6 ] [Wang, Jianqi]Zhejiang Univ, MOE Key Lab Soft Soils & Geoenvironm Engn, Hangzhou 310058, Peoples R China
  • [ 7 ] [Yan, Huaxiang]Zhejiang Univ, MOE Key Lab Soft Soils & Geoenvironm Engn, Hangzhou 310058, Peoples R China

Reprint 's Address:

  • 严华祥

    [Yan, Huaxiang]Fuzhou Univ, Zijin Sch Geol & Min, Fuzhou 350108, Peoples R China

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Source :

COMPUTERS AND GEOTECHNICS

ISSN: 0266-352X

Year: 2025

Volume: 187

5 . 3 0 0

JCR@2023

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count:

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 2

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