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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 23, 2020 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.2018021182
pages 1085-1096

NUMERICAL AND OPTIMIZATION STUDY OF MIXED CONVECTION DUE TO A ROTATING CYLINDER IN A POROUS CAVITY

Fatih Selimefendigil
Mechanical Engineering Department, Celal Bayar University, Manisa, 45140, Turkey
Hakan F. Öztop
Department of Mechanical Engineering, Technology Faculty, Firat University, Elazig, Turkey; Mechanical Engineering Department, Faculty of Engineering, King Abdulaziz University, P.O. Box 40844, Jeddah 21511, Saudi Arabia

Краткое описание

In this study, numerical study and optimization for a mixed convection in a porous cavity due to an inner rotating cylinder were performed by using the Galerkin weighted residual finite element method. An optimum circular cylinder size that maximizes average heat transfer along the hot wall was determined, and numerical simulation was performed for various values of Rayleigh number (between 104 and 106), angular rotational velocity of a circular cylinder (between -0.001 and 0.01), Darcy number (between 10-5 and 10-2), and porosity of the porous medium (between 0.25 and 0.5). The rotating cylinder with optimum size was found to have profound effects on the fluid flow and heat transfer characteristics, and 107.20% of heat transfer enhancement is obtained at the highest rotational speed when compared to motionless cylinder configuration. Local and average Nusselt number enhances with higher values of Rayleigh number, angular rotational speed of the cylinder (clockwise rotational direction), porosity, and permeability of the porous medium. Average heat transfer rate along the hot wall increases almost linearly with porosity of the porous medium. The average heat transfer rate versus Darcy number shows a saturated-type nonlinear curve near the step, especially for lower values of Richardson number and Hartmann number.