Numerical investigations of convection heat transfer in a thermal source-embedded porous medium via a lattice Boltzmann method
Convection heat transfer (CHT) in porous media founds broad significance in the applications of solar collectors, geothermal systems, and biological sciences. In this work, the natural CHT in a porous medium embedded with a rectangular thermal source at the bottom is numerically solved via the latti...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-02-01
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| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X22000041 |
| _version_ | 1818972018832310272 |
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| author | Cun-Hai Wang Zi-Yang Liu Ze-Yi Jiang Xin-Xin Zhang |
| author_facet | Cun-Hai Wang Zi-Yang Liu Ze-Yi Jiang Xin-Xin Zhang |
| author_sort | Cun-Hai Wang |
| collection | DOAJ |
| description | Convection heat transfer (CHT) in porous media founds broad significance in the applications of solar collectors, geothermal systems, and biological sciences. In this work, the natural CHT in a porous medium embedded with a rectangular thermal source at the bottom is numerically solved via the lattice Boltzmann method (LBM). The generalized Brinkman-Forchheimer-extended-Darcy model is applied to describe the momentum equation. The numerical solutions obtained by the LBM are verified against the experimental data for the correctness validation of the presented lattice Boltzmann model. Effects of the Darcy number (Da), medium porosity (ε), size of the thermal source, and the aspect ratio of the thermal source on the temperature- and flow-field in the porous medium are systematically investigated. Results show that the increase of Da remarkably enhances the heat exchange and changes the heat transfer mode from conduction to convection. The existence of the thermal source sidewall has a suppression effect on the heat exchange along the top wall of the thermal source, and this suppression effect is pronounced when the CHT is weak. |
| first_indexed | 2024-12-20T15:01:36Z |
| format | Article |
| id | doaj.art-94758bd2735045a2b45eeecca44f2e43 |
| institution | Directory Open Access Journal |
| issn | 2214-157X |
| language | English |
| last_indexed | 2024-12-20T15:01:36Z |
| publishDate | 2022-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj.art-94758bd2735045a2b45eeecca44f2e432022-12-21T19:36:39ZengElsevierCase Studies in Thermal Engineering2214-157X2022-02-0130101758Numerical investigations of convection heat transfer in a thermal source-embedded porous medium via a lattice Boltzmann methodCun-Hai Wang0Zi-Yang Liu1Ze-Yi Jiang2Xin-Xin Zhang3School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China; Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry, University of Science and Technology Beijing, Beijing, 100083, China; Corresponding author. School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China.School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, ChinaSchool of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China; Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry, University of Science and Technology Beijing, Beijing, 100083, ChinaSchool of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China; Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry, University of Science and Technology Beijing, Beijing, 100083, ChinaConvection heat transfer (CHT) in porous media founds broad significance in the applications of solar collectors, geothermal systems, and biological sciences. In this work, the natural CHT in a porous medium embedded with a rectangular thermal source at the bottom is numerically solved via the lattice Boltzmann method (LBM). The generalized Brinkman-Forchheimer-extended-Darcy model is applied to describe the momentum equation. The numerical solutions obtained by the LBM are verified against the experimental data for the correctness validation of the presented lattice Boltzmann model. Effects of the Darcy number (Da), medium porosity (ε), size of the thermal source, and the aspect ratio of the thermal source on the temperature- and flow-field in the porous medium are systematically investigated. Results show that the increase of Da remarkably enhances the heat exchange and changes the heat transfer mode from conduction to convection. The existence of the thermal source sidewall has a suppression effect on the heat exchange along the top wall of the thermal source, and this suppression effect is pronounced when the CHT is weak.http://www.sciencedirect.com/science/article/pii/S2214157X22000041Convection heat transferPorous mediumEmbedded thermal sourceLattice Boltzmann simulation |
| spellingShingle | Cun-Hai Wang Zi-Yang Liu Ze-Yi Jiang Xin-Xin Zhang Numerical investigations of convection heat transfer in a thermal source-embedded porous medium via a lattice Boltzmann method Case Studies in Thermal Engineering Convection heat transfer Porous medium Embedded thermal source Lattice Boltzmann simulation |
| title | Numerical investigations of convection heat transfer in a thermal source-embedded porous medium via a lattice Boltzmann method |
| title_full | Numerical investigations of convection heat transfer in a thermal source-embedded porous medium via a lattice Boltzmann method |
| title_fullStr | Numerical investigations of convection heat transfer in a thermal source-embedded porous medium via a lattice Boltzmann method |
| title_full_unstemmed | Numerical investigations of convection heat transfer in a thermal source-embedded porous medium via a lattice Boltzmann method |
| title_short | Numerical investigations of convection heat transfer in a thermal source-embedded porous medium via a lattice Boltzmann method |
| title_sort | numerical investigations of convection heat transfer in a thermal source embedded porous medium via a lattice boltzmann method |
| topic | Convection heat transfer Porous medium Embedded thermal source Lattice Boltzmann simulation |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X22000041 |
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