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Numerical Analysis on the Radiation-Convection Coupled Heat Transfer in an Open-Cell Foam Filled Annulus

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  • Xue Chen

    (School of Mechatronics Engineering, Harbin Institute of Technology, 92, West Dazhi Street, Harbin 150001, China
    School of Energy Science and Engineering, Harbin Institute of Technology, 92, West Dazhi Street, Harbin 150001, China)

  • Chuang Sun

    (School of Energy Science and Engineering, Harbin Institute of Technology, 92, West Dazhi Street, Harbin 150001, China)

  • Xinlin Xia

    (School of Energy Science and Engineering, Harbin Institute of Technology, 92, West Dazhi Street, Harbin 150001, China)

  • Rongqiang Liu

    (School of Mechatronics Engineering, Harbin Institute of Technology, 92, West Dazhi Street, Harbin 150001, China)

Abstract

Forced flow and radiation-convection coupled heat transfer in an annulus filled with open-cell foam was numerically investigated at high temperatures. The Darcy-Brinkman-Forchheimer model was utilized to represent the fluid transport. The two-energy equation model was applied for the non-equilibrium heat exchange between the fluid and solid phases, while the radiation heat transfer within the foam material was solved using the P1 approximation. Two different cases of thermal boundary conditions were studied and discussed in detail, namely the inner wall with a constant heat flux while the outer wall was adiabatic (case I) and vice versa (case II). The effects of pertinent factors on the heat transfer characteristics were examined, such as the foam structural parameters and the radii ratio of the annulus. The temperature, local and average Nusselt number were predicted. The results indicate that neglecting the thermal radiation causes a large deviation in predicting the thermal performance of such foam-fluid systems. Increasing the porosity and pore diameter both promote the radiation heat transfer, while it is weakened by increasing the radii ratio. The average Nusselt number decreases as the porosity increases, while it exhibits a non-monotonic change with the pore diameter and radii ratio. Besides, case I shows a higher average Nusselt number than case II and presents an improved thermal performance.

Suggested Citation

  • Xue Chen & Chuang Sun & Xinlin Xia & Rongqiang Liu, 2018. "Numerical Analysis on the Radiation-Convection Coupled Heat Transfer in an Open-Cell Foam Filled Annulus," Energies, MDPI, vol. 11(10), pages 1-20, October.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:10:p:2713-:d:174946
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    References listed on IDEAS

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    1. Geir Hansen & Erling Næss & Kolbeinn Kristjansson, 2016. "Analysis of a Vertical Flat Heat Pipe Using Potassium Working Fluid and a Wick of Compressed Nickel Foam," Energies, MDPI, vol. 9(3), pages 1-17, March.
    2. Ahmed, Hamdi E. & Ahmed, Mirghani I., 2017. "Thermal performance of annulus with its applications; A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 71(C), pages 170-190.
    3. Saiwei Li & Yu Chen & Zhiqiang Sun, 2017. "Numerical Simulation and Optimization of the Melting Process of Phase Change Material inside Horizontal Annulus," Energies, MDPI, vol. 10(9), pages 1-14, August.
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    Cited by:

    1. Zhang, Hao & Shuai, Yong & Lougou, Bachirou Guene & Jiang, Boshu & Yang, Dazhi & Pan, Qinghui & Wang, Fuqiang & Huang, Xing, 2022. "Effects of foam structure on thermochemical characteristics of porous-filled solar reactor," Energy, Elsevier, vol. 239(PC).

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