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Journal of Porous Media
Impact-faktor: 1.49 5-jähriger Impact-Faktor: 1.159 SJR: 0.43 SNIP: 0.671 CiteScore™: 1.58

ISSN Druckformat: 1091-028X
ISSN Online: 1934-0508

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

Journal of Porous Media

DOI: 10.1615/JPorMedia.v18.i7.50
pages 699-716

CONJUGATE NATURAL CONVECTION IN A DIFFERENTIALLY HEATED COMPOSITE ENCLOSURE FILLED WITH A NANOFLUID

Muneer A. Ismael
Mechanical Engineering Department, Engineering College, University of Basrah, Basrah 61004, Iraq
Ali J. Chamkha
Department of Mechanical Engineering, Prince Sultan Endowment for Energy and Environment, Prince Mohammad Bin Fahd University, Al-Khobar 31952, Kingdom of Saudi Arabia; RAK Research and Innovation Center, American University of Ras Al Khaimah, United Arab Emirates, 10021

ABSTRAKT

Laminar natural convection inside a square composite vertically layered cavity is studied numerically using under a successive relaxation (USR) upwind-scheme finite difference method. The cavity is set up as follows from the left: a solid wall, a porous layer, and a nanofluid layer. The porous layer is saturated with the same nanofluid. The cavity is heated isothermally from the solid wall and cooled from the right wall. The top and bottom walls are kept adiabatic. All the walls are assumed impermeable, except the interface between the porous and nanofluid layers. The Darcy−Brinkman model is invoked for the porous layer. Double-domain formulation is followed for the porous and nanofluid layers. The studied parameters are Darcy number Da (10−7−10−1), Rayleigh number Ra (103−106), wall thermal conductivity kw (0.269, 14.589 W/m.°C), thicknesses of layers Ww (0.1−0.7), Wp (0.1−0.5), and the Cu nanoparticle volume fraction φ (0.0−0.05). Alternative models for the nanofluid thermal conductivity and dynamic viscosity are used, and a comparison among different models combinations is conducted. The results show that the enhancement of natural convection is attained when the permeability (Da) of the porous medium is very low and the porous layer thickness is greater than 0.5, provided that the Rayleigh number is less than or equal to 104. The solid wall type is found to play a considerable role in the flow and heat transfer fields. It is also found that the conduction heat transfer within the solid wall is affected by the permeability of the porous layer.


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