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Heat Transfer Research
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ISSN Druckformat: 1064-2285
ISSN Online: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2015010704
pages 295-308

NUMERICAL STUDY OF SLIP EFFECT AT THE POROUS MEDIUM/FLUID INTERFACE IN AN ENCLOSURE PARTIALLY FILLED WITH A POROUS MEDIUM

Baoming Chen
School of Energy and Power Engineering, Shandong University, Jinan, China; School of Thermal Energy Engineering, Shandong Jianzhu University, Jinan, China
Fang Liu
School of Thermal Energy Engineering, Shandong Jianzhu University, Jinan, China
Guoqing Zhang
Key Laboratory of Renewable Energy Utilization Technologies in Building, Ministry of Education, Shandong Key Laboratory of Renewable Energy Application Technology, School of Thermal Engineering, Shandong Jianzhu University, Jinan, Shandong 250101, PR China
Zhi Liu
Key Laboratory of Renewable Energy Utilization Technologies in Building, Ministry of Education, Shandong Key Laboratory of Renewable Energy Application Technology, School of Thermal Engineering, Shandong Jianzhu University, Jinan, Shandong 250101, PR China
Xiang Ji
Key Laboratory of Renewable Energy Utilization Technologies in Building, Ministry of Education, Shandong Key Laboratory of Renewable Energy Application Technology, School of Thermal Engineering, Shandong Jianzhu University, Jinan, Shandong 250101, PR China

ABSTRAKT

Fluid flow and heat transfer in a cavity partially filled with a porous medium are studied numerically and the finite element method is used to solve the mathematical model based on a one-domain approach. The sketch of a real porous structure obtained by using X-ray computed tomography is imported into the physical model. The flow properties in the transition region and stress jump coefficient at the porous medium/fluid interface are analyzed for different Rayleigh numbers. The numerical results show that the shear stress in the transition region increased quickly compared with those in homogeneous regions. The change rate of velocity is larger than the change rate of shear stress. The coefficient keeps nearly constant at Ra ≤ 104, and increases slowly with the Rayleigh number, then quickly increases when Ra ≥ 106.


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