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NATURAL CONVECTION IN A CAVITY FILLED WITH POROUS MEDIUM WITH PARTIALLY THERMAL ACTIVE SIDEWALLS UNDER LOCAL THERMAL NONEQUILIBRIUM CONDITIONS

Volume 17, Numéro 11, 2014, pp. 983-997
DOI: 10.1615/JPorMedia.v17.i11.40
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RÉSUMÉ

Steady non-Darcian natural convection in a square cavity filled with a heat-generating porous medium is studied numerically by adopting the local thermal nonequilibrium model. All of the walls of the enclosure are adiabatic except the left wall, which is set as the partially active thermal wall. Six different cooling zones are considered along the left vertical wall, and a two-equation model is used in consideration of the microscopic heat transfer between the solid and fluid phases. It is found that the cooling of a single wall can generate unsymmetrical distribution of streamlines, and isotherms of fluid phase in porous enclosures when Rayleigh number is high (Ra = 107). The local Nusselt number of solid phase (Nusy) presents symmetrical distribution about the center line of Y direction. The total heat transfer rate Q of case A has a higher value and its increasing rate becomes larger with the increase of porosity. Compared with other thermally active cases, the value of the total heat transfer rate Q of case E is the lowest with an increase of porosity.

CITÉ PAR
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  2. Wu Feng, Zhou Wenjing, Ma Xiaoxun, Natural convection in a porous rectangular enclosure with sinusoidal temperature distributions on both side walls using a thermal non-equilibrium model, International Journal of Heat and Mass Transfer, 85, 2015. Crossref

  3. Wu Feng, Wang Gang, Zhou Wenjing, Numerical Study of Natural Convection in a Porous Cavity with Sinusoidal Thermal Boundary Condition, Chemical Engineering & Technology, 39, 4, 2016. Crossref

  4. Wu Feng, Wang Gang, Zhou Wenjing, Buoyancy induced convection in a porous cavity with sinusoidally and partially thermally active sidewalls under local thermal non-equilibrium condition, International Communications in Heat and Mass Transfer, 75, 2016. Crossref

  5. Wu Feng, Wang Gang, Zhou Wenjing, Aspect ratio effect on natural convection in a square enclosure with a sinusoidal active thermal wall using a thermal non-equilibrium model, Numerical Heat Transfer, Part A: Applications, 70, 3, 2016. Crossref

  6. Wu Feng, Lu Dilai, Wang Gang, Numerical analysis of natural convection in a porous cavity with the sinusoidal thermal boundary condition using a thermal nonequilibrium model, Numerical Heat Transfer, Part A: Applications, 69, 11, 2016. Crossref

  7. Malik Sumit, Nayak A.K., MHD convection and entropy generation of nanofluid in a porous enclosure with sinusoidal heating, International Journal of Heat and Mass Transfer, 111, 2017. Crossref

  8. Kumar Vikash, Rani Abha, Singh Ajay Kumar, Numerical solution of non-Darcian effects on natural convection in a rectangular inclined porous enclosure with heated walls, RECENT TRENDS IN PURE AND APPLIED MATHEMATICS, 2177, 2019. Crossref

  9. Al-Weheibi Sheikha M., Rahman M. M., Saghir M. Z., Impacts of Variable Porosity and Variable Permeability on the Thermal Augmentation of Cu–H2O Nanofluid-Drenched Porous Trapezoidal Enclosure Considering Thermal Nonequilibrium Model, Arabian Journal for Science and Engineering, 45, 2, 2020. Crossref

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