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Computation of combined natural-convection and radiation heat-transfer in a cavity having a square body at its center

Author

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  • Mezrhab, A.
  • Bouali, H.
  • Amaoui, H.
  • Bouzidi, M.

Abstract

This paper describes a numerical study of the radiation-natural convection interactions in a differentially-heated cavity with an inner body. A specifically developed numerical model, based on the finite-volume method, is used for the solutions of the governing differential-equations. The SIMPLER algorithm for the pressure-velocity coupling is adopted. The fluid (air) is perfectly transparent to the radiation. The surface emissivity [epsilon], the Rayleigh number Ra, and the thermal conductivity ratio Rk were varied parametrically. For Pr = 0.71 and relatively wide ranges of the other parameters, results are reported in terms of isotherms, streamlines, average Nusselt-numbers across the enclosure, local Nusselt-numbers at the hot and cold walls, vertical and horizontal median velocities and horizontal walls, temperature distributions. It is found that: (i) the radiation exchange homogenizes the temperature inside the cavity and produces an increase in the average Nusselt-number, particularly when Rk and Ra are high and (ii) the average Nusselt-number increases with increasing surface emissivity, especially at high Rayleigh numbers.

Suggested Citation

  • Mezrhab, A. & Bouali, H. & Amaoui, H. & Bouzidi, M., 2006. "Computation of combined natural-convection and radiation heat-transfer in a cavity having a square body at its center," Applied Energy, Elsevier, vol. 83(9), pages 1004-1023, September.
    • Handle: RePEc:eee:appene:v:83:y:2006:i:9:p:1004-1023
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    Citations

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    Cited by:

    1. Mezrhab, Ahmed & Elfarh, Larbi & Naji, Hassan & Lemonnier, D., 2010. "Computation of surface radiation and natural convection in a heated horticultural greenhouse," Applied Energy, Elsevier, vol. 87(3), pages 894-900, March.
    2. Wu, Ying-Ying & Wu, Shuang-Ying & Xiao, Lan, 2018. "Heat dissipation characteristics from photovoltaic cells within the partitioned or non-partitioned glazed cavity to the windy environment," Renewable Energy, Elsevier, vol. 127(C), pages 642-652.
    3. Hernández-López, I. & Xamán, J. & Chávez, Y. & Hernández-Pérez, I. & Alvarado-Juárez, R., 2016. "Thermal energy storage and losses in a room-Trombe wall system located in Mexico," Energy, Elsevier, vol. 109(C), pages 512-524.
    4. Wen-He Zhou & Lei Sun & Si-Si Li & Jian-Yun Wu, 2023. "Radiation Effect on Heat Transfer in Narrow Cavities," Energies, MDPI, vol. 16(11), pages 1-12, May.

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