ライブラリ登録: Guest
Begell Digital Portal Begellデジタルライブラリー 電子書籍 ジャーナル 参考文献と会報 リサーチ集
Journal of Porous Media
インパクトファクター: 1.49 5年インパクトファクター: 1.159 SJR: 0.43 SNIP: 0.671 CiteScore™: 1.58

ISSN 印刷: 1091-028X
ISSN オンライン: 1934-0508

巻:
巻 22, 2019 巻 21, 2018 巻 20, 2017 巻 19, 2016 巻 18, 2015 巻 17, 2014 巻 16, 2013 巻 15, 2012 巻 14, 2011 巻 13, 2010 巻 12, 2009 巻 11, 2008 巻 10, 2007 巻 9, 2006 巻 8, 2005 巻 7, 2004 巻 6, 2003 巻 5, 2002 巻 4, 2001 巻 3, 2000 巻 2, 1999 巻 1, 1998

Journal of Porous Media

DOI: 10.1615/JPorMedia.v9.i3.50
pages 235-250

Numerical Analysis of Natural Convection in Porous Media: The Influence of Non-Darcian Terms and Thermal Dispersion

Jesus Marlinaldo De Medeiros
Federal Center of Technological Education of Sergipe, 49400-000 Lagarto, Brazil
Jose Mauricio Gurgel
Federal University of Paraiba, Campus Universitário, João Pessoa PB, Brazil
Francisco Marcondes
Departamento de Engenharia Metalúrgica e Ciencias dos Materiais, Universidade Federal do Ceará

要約

Two-dimensional steady natural convection in a porous cavity, bounded both by isothermal vertical walls at different temperatures and adiabatic horizontal ones, has been numerically studied. A generalized model for the momentum equations was employed. Non-Darcian effects were taken into account in the momentum equations, the thermal dispersion effect and the variable stagnant thermal conductivity were included in the energy equation, and the wall effect on porosity variation was approximated by an exponential function. The governing equations in terms of the primitive variables were numerically solved by the finite-volume method using a staggered variable arrangement, and the pressure-velocity coupling was treated by the PRIME algorithm. The influence of the inertial, Brinkman's, and Forchheimer's terms was compared to the experimental and numerical Nusselt numbers available in the literature. The numerical results indicate that the generalized model with thermal dispersion reduces the discrepancy in the experimental results for Prandtl numbers ranging from 7.1 to 480 for a high modified Rayleigh number; while for a low modified Rayleigh number, the thermal dispersion term is not appropriate. Two correlations were also proposed in order to evaluate the average Nusselt number, considering the thermal dispersion: one for a tall cavity and another for a shallow cavity.


Articles with similar content:

Natural Convection in a Cavity Filled with a Porous Medium with Variable Porosity and Darcy Number
Journal of Porous Media, Vol.11, 2008, issue 7
Rejane De C. Oliveski, Ligia D. F. Marczak
NATURAL CONVECTION IN A TRAPEZOIDAL ENCLOSURE FILLED WITH A NON-DARCIAN POROUS MEDIUM
Journal of Porous Media, Vol.14, 2011, issue 6
Bader Alshriaan Al-Azmi
AUGMENTATION OF A HEAT REJECTION MECHANISM IN A VENTILATED ENCLOSURE FILLED PARTIALLY WITH A POROUS LAYER
Journal of Porous Media, Vol.15, 2012, issue 9
Khalil Khanafer, A. Al-Amiri
NON-DARCIAN AND ANISOTROPIC EFFECTS ON THE CONJUGATE HEAT TRANSFER IN A POROUS ENCLOSURE WITH FINITE THICKNESS WALLS
Journal of Porous Media, Vol.17, 2014, issue 4
Sameh Elsayed Ahmed, Abdelraheem M. Aly
Natural Convective Heat and Fluid Flow in a Two-Dimensional Enclosure with an Isoflux Partition Utilizing Different Fluids
Heat Transfer Research, Vol.41, 2010, issue 2
Biju T. Kuzhiveli, ANILKUMAR S.H