Thermal Conductivity Model Analysis of Unsaturated Ice-Containing Soil

Han, Qiang; Wang, Zhiguo; Qin, Rui

doi:10.1155/2022/3717705

Cited by 3 publications

(3 citation statements)

References 31 publications

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“…Compared to the size of the entire fluid region, the REV should be in a small range around the point p. The REV should be much larger than a single pore space and contain a sufficient number of pores. In the REV, the variation of the fundamental parameters with spatial coordinates is slight, and the average value tends to the actual value infinitely (Han et al, 2022a;Han et al, 2022b).…”

Section: Methodsmentioning

confidence: 99%

Analysis on “three-box” model of stress-strain in frozen soil porous media based on representative macroscopic Volume

et al. 2022

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In cold regions, the pore space’s composition and phase state can affect the elastic modulus of the media. During the winter, the freezing conditions in the soil results in the release of water from the pore space, which results in significant changes in the media’s distribution and composition. There are a few weaknesses in the current research with respect to the elastic modulus change example of frozen soil. This paper presents that the Representative Macroscopic Volume (RMV) choice strategy is provided for frozen soil with porosity as a typical condition variable. Under the state of freezing, a “three-box” analytical model for stress-strain calculation of frozen soil porous media is established, namely, the black-box model, the gray-box model, and the white-box model. The relevant equations for calculating elastic modulus are presented based on the proposed “three-box” model and the analysis of the stress conduction process. Results show that the discrepancy between the computed and experimental values of the white-box model is slight, and the elastic modulus of frozen soil calculated by the model established in this paper is consistent with the actual state. It can be deduced that the model established in this paper has practicality and the conclusions of the study are of guiding significance for the application of frozen soil.

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Section: Methodsmentioning

confidence: 99%

Analysis on “three-box” model of stress-strain in frozen soil porous media based on representative macroscopic Volume

et al. 2022

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“…According to the Maxwell equation, the weighted thermal conductivity models such as the Wiener bounds model and Hashin–Shtrikman (H–S) bounds model were introduced . A few modified models based on the mixed method were presented for the ETC of a three-phase mixture. − Also, the representative elementary volume (REV) method was proposed to predict the ETC of unsaturated bentonite, fly ash soil, sand, and ice-containing soil . However, the pore size may be equivalent to the molecular average free path in unconventional reservoirs, and both Knudsen diffusion and rough surface may have a considerable impact on the heat transfer process.…”

Section: Introductionmentioning

confidence: 99%

“…19−25 (REV) method 26 was proposed to predict the ETC of unsaturated bentonite, 27 fly ash soil, 28 sand, 29 and icecontaining soil. 30 However, the pore size may be equivalent to the molecular average free path in unconventional reservoirs, and both Knudsen diffusion and rough surface may have a considerable impact on the heat transfer process.…”

Section: Introductionmentioning

confidence: 99%

Fractal Pore-Scale Model for Effective Thermal Conductivity of Multiscale Unsaturated Porous Media

Xu,

Meng,

Wang

et al. 2023

Energy Fuels

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Accurate prediction of effective thermal conductivity (ETC) is crucial in thermally enhanced oil recovery (TEOR) for unconventional reservoirs. However, the multiscale structures and multiphase media of unconventional reservoirs challenge the ETC prediction. A novel pore-scale physical model for ETC of multiscale unsaturated porous media is developed by using series−parallel thermal−electrical analogy, where the size distribution of pores and rough elements as well as tortuous flow paths are characterized by fractal geometry. The proposed fractal model shows acceptable agreement with the experimental results. It is found that the increment of tortuosity induces an increase in the thermal resistance of the series part and reduces the ETC accordingly. The rough surface and Knudsen effect can enhance and reduce the ETC, respectively. The present explicit analytical expression for ETC provides a fast and effective way to predict the ETC of unconventional reservoirs, and it also sheds light on the heat conduction mechanisms of multiscale unsaturated porous media.

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Analysis on Stress-Strain Model of Unsaturated Ice-Containing Soil

et al. 2022

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The relationship between the stress-strain characteristics of ice-containing unsaturated soil and its various physical properties has important implications for the design and construction of transportation and building projects. The study also reveals the varying phases of the substance that can be deposited within the pore space. During winter, the freezing-thawing cycles affect the various media that can be deposited within the soil pore space, such as water and other water. The presence of water and others in the soil’s pores can cause a freeze-thawing phenomenon and a significant change in the material’s elastic modulus. This paper presents a method that uses the representative elementary volume (REV) model to perform a representative state variable analysis on an unsaturated ice-containing soil with porosity. The three stress-strain REV models that were developed for the study were designed to analyze the properties of an unsaturated ice-containing soil under freezing-thawing conditions. Then a comprehensive analysis of the soil’s various components was performed. The effects of frozen soil on the change law of the relationship between different porous medium are studied. The study also explores the effects of the presence of porosity on the variation law of the frozen soil relationship between the stress-strain. The paper presents the study of the variation characteristics of the elastic modulus of permafrost soil. It also explores the various factors (porosity, moisture content, ice percentage, and tortuosity) that influence the stress-strain characteristics of unsaturated soil.

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Thermal Conductivity Model Analysis of Unsaturated Ice-Containing Soil

Cited by 3 publications

References 31 publications

Analysis on “three-box” model of stress-strain in frozen soil porous media based on representative macroscopic Volume

Analysis on “three-box” model of stress-strain in frozen soil porous media based on representative macroscopic Volume

Fractal Pore-Scale Model for Effective Thermal Conductivity of Multiscale Unsaturated Porous Media

Analysis on Stress-Strain Model of Unsaturated Ice-Containing Soil

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