Abo Bibliothek: Guest
Digitales Portal Digitale Bibliothek eBooks Zeitschriften Referenzen und Berichte Forschungssammlungen
Journal of Porous Media
Impact-faktor: 1.49 5-jähriger Impact-Faktor: 1.159 SJR: 0.504 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.v16.i11.20
pages 979-995

CONJUGATED NATURAL CONVECTION IN HORIZONTAL ANNULI PARTIALLY FILLED WITH METALLIC FOAMS BY USING TWO-EQUATION MODEL

Zhiguo Qu
Key Laboratory of Thermo-Fluid Science and Engineering Ministry of Education School of Power and Energy Engineering Xi'an Jiaotong University, Xi'an, 710049, China
H. J. Xu
MOE Key Laboratory of Thermo-Fluid Science and Engineering, Energy and Power Engineering School, Xi'an Jiaotong University, Xi'an 710049, China
Wen-Quan Tao
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science & Engineering, Tongji University, Shanghai 200092, China; Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xian Jiaotong University, Xian 710049, China

ABSTRAKT

The current study presents the natural convection in a horizontally positioned concentric annulus partially filled with highly conductive metallic foams by using a two-equation model for non-equilibrium heat transfer. Annuli with a porous layer sintered on the inner wall (mode I) and on the outer wall (mode II) are compared with each other via numerical simulation. In the metal-foam region, the momentum transfer is described using the Forchheimer and Brinkman-extended Darcy flow model, whereas the energy conservation is described using the local thermal non-equilibrium model. Some numerical treatments are adopted for the conjugated flow and heat transfer in the two regions besides the foam-fluid interface. The effects of some key parameters on heat transfer are discussed. These key parameters include the Rayleigh number (Ra), dimensionless foam thickness, thermal conductivity ratio, porosity, and pore density. The conductiondominated, transition, and convection-dominated regimes are found with increasing Ra. The dimensionless interfacelocation scope for the thermal performance being superior to empty annulus is provided for the two modes. Under the same foam thickness, the Nusselt number of mode I is slightly higher than that of mode II.


Articles with similar content:

GEOMETRY EFFECTS ON CRITICAL CONDUCTIVITY RATIO AND WALL THICKNESS FOR CONJUGATE NATURAL CONVECTION IN ECCENTRIC ANNULI
International Heat Transfer Conference 13, Vol.0, 2006, issue
Maged A. I. El-Shaarawi, A. Jamal
Heat Transfer Enhancement in a Composite Parallel Plate Channel: Utilizing the Low-Reynolds-Number k − ε Model
Journal of Porous Media, Vol.10, 2007, issue 3
Abdulmajeed A. Mohamad, A. A. Saati
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
LATTICE BOLTZMANN SIMULATION OF HEAT TRANSFER ENHANCEMENT IN AN ASYMMETRICALLY HEATED CHANNEL FILLED WITH RANDOM POROUS MEDIA
Journal of Porous Media, Vol.20, 2017, issue 2
Abbas Abbassi, Alireza Salehi, Mohammad Abbaszadeh
NATURAL CONVECTION IN AN ENCLOSURE SATURATEDWITH MULTILAYER POROUS MEDIUM AND NANOFLUID OVER CIRCULAR CYLINDERS: ENTROPY GENERATION
Journal of Porous Media, Vol.21, 2018, issue 10
Sameh Elsayed Ahmed, Abdelraheem M. Aly, Z. A. S. Raizah