4.7 Article

Internal thermal source effects on convection heat transfer in a two-dimensional porous medium: A lattice Boltzmann study

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出版社

ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ijthermalsci.2021.107416

关键词

Convection heat transfer; Porous medium; Internal thermal source; Lattice Boltzmann simulation

资金

  1. National Natural Science Foundation of China [51906014]
  2. Fundamental Research Funds for the Central Universities [FRF-BD-20-09A]
  3. Science Foundation of China University of Petroleum [2462021YJRC005]

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Regulating natural convection heat transfer in porous media via internal thermal sources is crucial for thermal engineering applications. Numerical simulations in a square cavity filled with a porous medium reveal that changing the location, size, and number of thermal sources has varying effects on convection heat transfer.
Regulating the natural convection heat transfer (CHT) in porous media is of vital significance in thermal engineering applications. Here, the CHT in a square cavity filled with a porous medium containing air and an internal thermal source or multiple thermal sources is numerically solved via a thermal lattice Boltzmann (LB) method. The generalized Brinkman-Forchheimer-extended Darcy model and the energy equation are applied to describe the process of momentum transfer and heat transfer, respectively, occurring in the porous medium. The numerical model is validated through comparison with experimental data from the literature. The temperature distributions, flow field inside the porous medium, and average Nusselt number along the thermal source walls are calculated, and the effect on the CHT in the square cavity of varying the location, size, and number of thermal sources are investigated. Results indicate that varying these control parameters shows different enhancement or suppression effects on the CHT along the thermal source walls. The results from this study provide an important reference for regulating CHT in porous media via the presence of internal thermal sources, and they are thus expected to have a significant impact on heat transfer regulation in industrial thermal engineering designs.

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