Mesoscopic study of the effective thermal conductivity of dry and moist soil

Cai, Shanshan; Zhang, Boxiong; Cui, Tengfei; Guo, Haijin; Huxford, Joe

doi:10.1016/j.ijrefrig.2018.10.023

Cited by 14 publications

(1 citation statement)

References 31 publications

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“…Their numerical results proved to agree with experimental values to a large extent. Cai et al [22] applied the lattice Boltzmann method to predict the thermal conductivity of dry and moist soil. In their work, the soil structure was restructured by the Monte-Carlo fractal method to consider the soil characteristics, and the soil particles were assumed to be circles of unequal diameter.…”

Section: Introductionmentioning

confidence: 99%

Predicting the effective thermal conductivity of unfrozen soils with various water contents based on artificial neural network

Zhu

et al. 2021

Nanotechnology

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The effective thermal conductivity of soils is a crucial parameter for many applications such as geothermal engineering, environmental science, and agriculture and engineering. However, it is pretty challenging to accurately determine it due to soils’ complex structure and components. In the present study, the influences of different parameters, including silt content (m si), sand content (m sa), clay content (m cl), quartz content (m qu), porosity, and water content on the effective thermal conductivity of soils, were firstly analyzed by the Pearson correlation coefficient. Then different artificial neural network (ANN) models were developed based on the 465 groups of thermal conductivity of unfrozen soils collected from the literature to predict the effective thermal conductivity of soils. Results reveal that the parameters of m si, m sa, m cl, and m qu have a relatively slight influence on the effective thermal conductivity of soils compared to the water content and porosity. Although the ANN model with six parameters has the highest accuracy, the ANN model with two input parameters (porosity and water content) could predict the effective thermal conductivity well with acceptable accuracy and R 2 = 0.940. Finally, a correlation of the effective thermal conductivity for different soils was proposed based on the large number of results predicted by the two input parameters ANN-based model. This correlation has proved to have a higher accuracy without assumptions and uncertain parameters when compared to several commonly used existing models.

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Section: Introductionmentioning

confidence: 99%