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UNSTEADY DOUBLE-DIFFUSIVE NATURAL CONVECTION AND THERMAL RADIATION WITHIN A VERTICAL POROUS ENCLOSURE

Volumen 16, Edición 2, 2013, pp. 167-182
DOI: 10.1615/JPorMedia.v16.i2.70
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SINOPSIS

Heat and mass transfer by double-diffusive natural convection and thermal radiation in a porous cavity opened at its top end, insulated at the bottom wall, and filled with a fluid-saturated porous medium has been numerically investigated. The porous medium, at local thermal equilibrium assumption, is considered as a fictitious homogeneous, isotropic, and participating medium that can emit, absorb, and scatter isotropically radiative energy. The side vertical walls of the enclosure are isothermal and gray. In this paper, a physical phenomena description has been presented and a sensitivity study of fluid flow and heat and mass transfer to different controlling radiative parameters, such as the particular emissivity ε, the optical thickness τD, the single scattering albedo ω, and the conduction−radiation parameter N, has been performed. The results indicate that the temperature and the axial velocity values are increased when ε and τD are increased or when ω and N are decreased. Moreover, the concentration values are decreased when ε and τD are increased or when ω and N are decreased.

CITADO POR
  1. Harzallah Hosni Souheil, Jbara Abdessalem, Slimi Khalifa, Double-Diffusive Natural Convection in Anisotropic Porous Medium Bounded by Finite Thickness Walls: Validity of Local Thermal Equilibrium Assumption, Transport in Porous Media, 103, 2, 2014. Crossref

  2. Nikbakhti Rasoul, Khodakhah Javad, Numerical investigation of double diffusive buoyancy forces induced natural convection in a cavity partially heated and cooled from sidewalls, Engineering Science and Technology, an International Journal, 19, 1, 2016. Crossref

  3. Nield Donald A., Bejan Adrian, Double-Diffusive Convection, in Convection in Porous Media, 2017. Crossref

  4. Himrane N., Ameziani D. E., El Ganaoui M., Ragueb H., Some Insights on Unsteady Double Diffusive Natural Convection of Porous Medium in Vertical Open-Ended Cylinder, Arabian Journal for Science and Engineering, 44, 2, 2019. Crossref

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