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多孔介质期刊
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ISSN 打印: 1091-028X
ISSN 在线: 1934-0508

多孔介质期刊

DOI: 10.1615/JPorMedia.v17.i12.70
pages 1109-1119

CONJUGATE HEAT TRANSFER IN POROUS ANNULUS

Ahmed N. J. Salman
Faculty of Engineering & Technology, Multimedia University, 75450 Bukit Beruang, Malacca, Malaysia
Sarfaraz Kamangar
Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, 50603, Malaysia
Irfan Anjum Badruddin
Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, 50603, Malaysia
Abdullah A. A. A. Al-Rashed
Department of Automotive and Marine Engineering Technology, College of Technological Studies, Public Authority for Applied Education and Training, Kuwait
G. A. Quadir
School of Mechatronic Engineering, University Malaysia Perlis (UniMAP), Pauh Putra, 02600, Arau, Perlis, Malaysia
H. M. T. Khaleed
Department of Mechanical Engineering, Faculty of Engineering, Islamic University, Madinah Munawwarra, Kingdom of Saudi Arabia
T. M. Yunus Khan
Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, 50603, Malaysia

ABSTRACT

The effect of conductivity ratio on temperature at a solid-porous interface is one of the most important aspects in conjugate heat transfer. The present work is undertaken to investigate heat transfer behavior in a porous annular vertical cylinder having a solid wall at the inner surface The main objective ofthe present study is to evaluate the effect of solid wall thickness and conductivity ratio on heat transfer characteristics ofthe porous medium. The inner and outer surfaces of the annulus are maintained isothermally at Th and T respectively, such that Th > T. The increase in conductivity ratio leads to an increase in temperature at the solid-porous interface. It is noticed that the temperature variation along the porous region is almost linear for higher values ofconductivity ratio and wall thickness ratio. It is found that the fluid velocity decreases with increase in wall thickness. It is observed that the Nusselt number decreases with increase in solid wall thickness. The effect ofthe aspect ratio is found to be negligible when porous conductivity is much higher than that of the solid wall conductivity. The attainment of the maximum Nusselt number at Ar ~1 in a porous annulus does not hold good for the conjugate heat transfer problem. The variation in Nusselt number is sensitive for higher wall thickness ratio and lower conductivity ratio.


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