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LATTICE BOLTZMANN SIMULATION OF HEAT TRANSFER ENHANCEMENT IN AN ASYMMETRICALLY HEATED CHANNEL FILLED WITH RANDOM POROUS MEDIA

卷 20, 册 2, 2017, pp. 175-191
DOI: 10.1615/JPorMedia.v20.i2.60
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摘要

In this paper, numerical simulation of fluid flow and heat transfer in a 2D planar channel, partially and full filled with random fibrous porous media, is performed using the lattice Boltzmann method (LBM). The fibrous media is constructed of a random matrix of solid fibers, modeled as square obstacles and located in a cross flow. The thermal asymmetry is imposed on the system, such that one wall is isothermal and the other wall is insulated. Nonlocal thermal equilibrium conditions combined with pore level simulation are applied to the solid phase. Criterion for enhancement of heat transfer due to the presence of porous medium is the average Nusselt number on the isothermal wall. The effects of geometrical parameters such as porosity, blockage ratio, and porous block eccentricity, as well as some thermophysical parameters such as Reynolds and Prandtl numbers, are studied. The obtained results indicated that the position and the width of the random porous block has significant influence on the thermal performance of the channel. Furthermore, it was found that channels partially filled with porous medium are more efficient than the fully filled ones. Also, decreasing the porosity or using smaller fibers at a constant porosity can enhance the rate of heat transfer.

对本文的引用
  1. Makinde Oluwole Daniel, Rundora Lazarus, Unsteady Mixed Convection Flow of a Reactive Casson Fluid in a Permeable Wall Channel Filled with a Porous Medium, Defect and Diffusion Forum, 377, 2017. Crossref

  2. Rostamzadeh H., Salimi M. R., Taeibi-Rahni M., Pore-scale modeling of rarefied gas flow in fractal micro-porous media, using lattice Boltzmann method (LBM), Journal of Thermal Analysis and Calorimetry, 135, 3, 2019. Crossref

  3. Lai Tianwang, Liu Xiangyang, Xue Sa, Xu Jimin, He Maogang, Zhang Ying, Extension of Ergun equation for the calculation of the flow resistance in porous media with higher porosity and open-celled structure, Applied Thermal Engineering, 173, 2020. Crossref

  4. Tariq Ammar, Li Peng, Xu Anyi, Liu Zhenyu, A Correlation for Nusselt Number of Slip Gas Flow in Confined Porous Media, Journal of Heat Transfer, 142, 9, 2020. Crossref

  5. Lai Tianwang, Liu Xiangyang, Chu Jianchun, He Maogang, Zhang Ying, Numerical Study of Flow and Heat Transfer in a Rectangular Channel Partially Filled with Porous Media at the Pore Scale Using Lattice Boltzmann Method, Heat Transfer Engineering, 43, 8-10, 2022. Crossref

  6. Tariq Ammar, Liu Zhenyu, Heat transfer and friction factor correlations for slip gaseous fluid flow in confined porous medium with pore-scale LBM modelling, International Journal of Thermal Sciences, 173, 2022. Crossref

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