HEAT CONDUCTION CHARACTERISTICS OF SANDS AND APPARENT THERMAL CONDUCTIVITY PREDICTIVE CORRELATION MODEL

Chu Zhaoxiang; Wang Yijiang; Zhao Guangsi; Dong Kaijun; Sun Qin; Wang Zegui

doi:10.19912/j.0254-0096.tynxb.2020-0932

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (5) : 1-9. DOI: 10.19912/j.0254-0096.tynxb.2020-0932

HEAT CONDUCTION CHARACTERISTICS OF SANDS AND APPARENT THERMAL CONDUCTIVITY PREDICTIVE CORRELATION MODEL

Chu Zhaoxiang, Wang Yijiang², Zhao Guangsi², Dong Kaijun¹, Sun Qin¹, Wang Zegui²

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Abstract

The steady state heat conduction processes of multi-phase （solid-liquid-gas） and porous/granular sandy soil were simulated via finite element method （COMSOL Multiphysics） in a periodic unit cell under ideal assumptions, based on which the heat conduction characteristics and change laws of its effective thermal conductivity （ETC） were obtained. The results indicate that the ETC of the unit cell decreases with the porosity while increases with the saturation, and the decrease and increase tendencies, however, slow down gradually, showing good agreements with existing theoretical and experimental studies. The adversely calculated ETC using the simulated results under the combination of boundary conditions of constant wall temperature + adiabatic boundary + the third Robin boundary condition has the best performance. Based on the numerical experiment results, the established exponent/power-law function between the ETC of sand and porosity, saturation provides higher coincidence degree with experimental regression model in low and high saturation region. Compared with theoretical and experimental research, the numerical simulation/experiment can effectively capture the microscopic heat conduction characteristics of sands and establish the ETC predictive correlation model using basic soil physical parameters with acceptable accuracy.

Key words

shallow geothermal energy / sand / porous media / porosity / saturation / thermal conductivity / numerical simulation

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Chu Zhaoxiang, Wang Yijiang, Zhao Guangsi, Dong Kaijun, Sun Qin, Wang Zegui. HEAT CONDUCTION CHARACTERISTICS OF SANDS AND APPARENT THERMAL CONDUCTIVITY PREDICTIVE CORRELATION MODEL[J]. Acta Energiae Solaris Sinica. 2022, 43(5): 1-9 https://doi.org/10.19912/j.0254-0096.tynxb.2020-0932

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