Significance of the natural convection to the heat transfer of porous media: a pore-scale study
Heat conduction in porous media is generally accompanied by the natural convection of the fluid within the pores driven by the temperature gradient. However, the criterion to determine the critical pore size of porous media where the natural convection cannot be neglected remains elusive. In this st...
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sg-ntu-dr.10356-1802082024-09-24T02:32:34Z Significance of the natural convection to the heat transfer of porous media: a pore-scale study Xuan, Zi-Hao Fang, Wen-Zhen Lu, Yu-Hao Yang, Chun Tao, Wen-Quan School of Mechanical and Aerospace Engineering Engineering Natural convection Porous media Heat conduction in porous media is generally accompanied by the natural convection of the fluid within the pores driven by the temperature gradient. However, the criterion to determine the critical pore size of porous media where the natural convection cannot be neglected remains elusive. In this study, a pore-scale model is established to investigate the contributions of natural convection on the effective thermal conductivity (ETC) of porous media, which takes the reconstructed microstructures as the geometry input. We thus examine the effects of the porosity, thermal conductivity of the fluid and solid phases, and heating direction on the critical pore size where the natural convection starts to work. The results show that the critical pore size decreases with increasing porosity and heating temperature, but increases with the rise in the thermal conductivity of solid phase. Moreover, the critical pore size is significantly lower for the lateral heating, compared with the bottom heating. Finally, we proposed a new formula as an indicator to determine the significance of natural convection to the heat transfer in porous media. This study is supported by the National Natural Science Foundation of China (No.52206110), National Postdoctoral Program for Innovative Talents (No. BX2021235), Basic Scientific Research Operating Expenses of Xi’an Jiaotong University (XJTU, No. xhj032021001–02). 2024-09-24T02:32:34Z 2024-09-24T02:32:34Z 2024 Journal Article Xuan, Z., Fang, W., Lu, Y., Yang, C. & Tao, W. (2024). Significance of the natural convection to the heat transfer of porous media: a pore-scale study. International Journal of Heat and Mass Transfer, 222, 125163-. https://dx.doi.org/10.1016/j.ijheatmasstransfer.2023.125163 0017-9310 https://hdl.handle.net/10356/180208 10.1016/j.ijheatmasstransfer.2023.125163 2-s2.0-85182520657 222 125163 en International Journal of Heat and Mass Transfer © 2023 Elsevier Ltd. All rights reserved. |
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Engineering Natural convection Porous media Xuan, Zi-Hao Fang, Wen-Zhen Lu, Yu-Hao Yang, Chun Tao, Wen-Quan Significance of the natural convection to the heat transfer of porous media: a pore-scale study |
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Heat conduction in porous media is generally accompanied by the natural convection of the fluid within the pores driven by the temperature gradient. However, the criterion to determine the critical pore size of porous media where the natural convection cannot be neglected remains elusive. In this study, a pore-scale model is established to investigate the contributions of natural convection on the effective thermal conductivity (ETC) of porous media, which takes the reconstructed microstructures as the geometry input. We thus examine the effects of the porosity, thermal conductivity of the fluid and solid phases, and heating direction on the critical pore size where the natural convection starts to work. The results show that the critical pore size decreases with increasing porosity and heating temperature, but increases with the rise in the thermal conductivity of solid phase. Moreover, the critical pore size is significantly lower for the lateral heating, compared with the bottom heating. Finally, we proposed a new formula as an indicator to determine the significance of natural convection to the heat transfer in porous media. |
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School of Mechanical and Aerospace Engineering |
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School of Mechanical and Aerospace Engineering Xuan, Zi-Hao Fang, Wen-Zhen Lu, Yu-Hao Yang, Chun Tao, Wen-Quan |
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Article |
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Xuan, Zi-Hao Fang, Wen-Zhen Lu, Yu-Hao Yang, Chun Tao, Wen-Quan |
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Xuan, Zi-Hao |
title |
Significance of the natural convection to the heat transfer of porous media: a pore-scale study |
title_short |
Significance of the natural convection to the heat transfer of porous media: a pore-scale study |
title_full |
Significance of the natural convection to the heat transfer of porous media: a pore-scale study |
title_fullStr |
Significance of the natural convection to the heat transfer of porous media: a pore-scale study |
title_full_unstemmed |
Significance of the natural convection to the heat transfer of porous media: a pore-scale study |
title_sort |
significance of the natural convection to the heat transfer of porous media: a pore-scale study |
publishDate |
2024 |
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https://hdl.handle.net/10356/180208 |
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1814047355298643968 |