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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Journal of Porous Media
Импакт фактор: 1.49 5-летний Импакт фактор: 1.159 SJR: 0.43 SNIP: 0.671 CiteScore™: 1.58

ISSN Печать: 1091-028X
ISSN Онлайн: 1934-0508

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

Journal of Porous Media

DOI: 10.1615/JPorMedia.2019018275
pages 73-85

NUMERICAL STUDY ON NATURAL CONVECTION IN A POROUS CAVITY THAT IS PARTIALLY HEATED AND COOLED BY SINUSOIDAL TEMPERATURE AT VERTICAL WALLS

Liamena Hassinet
LESEI, Department of Mechanical Engineering, University of Batna 2, Algeria
Mohamed Si-Ameur
LESEI Laboratory, Department of Mechanical Engineering, Technology Faculty, University of Batna 2, Algeria

Краткое описание

We numerically study unsteady natural convection flow in a cavity filled with porous media in two dimensions using a Brinkman–extended Darcy model. The cavity is heated at the lower half of the left vertical wall and cooled at the upper half of the right vertical wall by sinusoidal varying-temperature profiles, with amplitudes for heating λH and for cooling λC. Horizontal and remaining walls are insulated. We use the finite-control volume method to numerically solve governing conservative equations of mass, momentum, and energy. The problem is analyzed for different values of Rayleigh number Ra in the range 103 ≤ Ra ≤ 106, aspect ratio parameter Ar in the range 1 ≤ Ar ≤ 4, and sinusoidal temperature function in ranges 0.25 ≤ λH ≤ 1.0 and 0 ≤ λC ≤ 1.0. Numerical results show that heat transfer is mainly due to conduction at low Ra ≤ 104. The conduction heat-transfer regime is also indicated for low λH and λC ≤ 0.5. Conduction decreases with increasing λH and λC, and convection gradually becomes dominant with increasing Ra and decreasing Ar. Heat transfer increases with increasing Ra, λH, λC, and Ar = 2, when the convection regime is dominant.


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