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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: 0.504 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.v16.i11.30
pages 997-1010

THREE-DIMENSIONAL NUMERICAL SIMULATION OF A THREE-LAYERED RADIANT POROUS HEAT EXCHANGER WITH VARIABLE GAS PROPERTIES

Mohammad Sajedi
Mechanical Engineering Department, Shahid Bahonar University, Kerman, Iran
S. A. Gandjalikhan Nassab
Mechanical Engineering Department, School of Engineering, Shahid Bahonar University of Kerman, Kerman, Iran
E. Jahanshahi Javaran
Mechanical Engineering Department, Shahid Bahonar University, Kerman, Iran

Краткое описание

This paper deals with the thermal analysis of a new type of porous heat exchanger (PHE). This system operates based on energy conversion between gas enthalpy and thermal radiation. The proposed PHE has one high temperature (HT) and two heat recovery (HR1 and HR2) sections. In the HT section, the enthalpy of flowing high temperature gas that is converted to thermal radiation emitted towards the two heat recovery sections where the reverse energy conversion from thermal radiation to gas enthalpy occurs. In each section, a 3D cubic porous layer which is assumed to be absorbing, emitting and scattering is presented. For theoretical analysis of the PHE, the gas and solid phases are considered in nonlocal thermal equilibrium and separate energy equations are used for these two phases. For thermal analysis of the proposed PHE, the coupled energy equations for the gas and porous layer at each section are numerically solved using the finite difference method. The radiative transfer equation is solved by the discrete ordinates method (DOM) to compute the distribution of radiative heat flux in the porous layer. The numerical results consist of the gas and porous temperature distributions. The variations of radiative heat flux and gas property are also presented. Furthermore, the effects of scattering albedo, optical thickness and inlet gas temperature on the efficiency of the proposed PHE are investigated. It is shown that this type of porous heat exchanger has a very high efficiency especially when the porous layers have high optical thickness. The present results are compared with those reported theoretically by other researchers and good agreement is found.


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