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Research Papers

A Simple Thermal Resistance Model for Open Cell Metal Foams

[+] Author and Article Information
C. Balaji

e-mail: balaji@iitm.ac.in

S. P. Venkateshan

e-mail: spv@iitm.ac.in
Heat Transfer and Thermal Power Laboratory,
Department of Mechanical Engineering,
Indian Institute of Technology Madras,
Chennai 600036, India

1Corresponding authors.

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Heat Transfer. Manuscript received March 12, 2012; final manuscript received October 6, 2012; published online February 8, 2013. Assoc. Editor: Andrey Kuznetsov.

J. Heat Transfer 135(3), 032601 (Feb 08, 2013) (9 pages) Paper No: HT-12-1091; doi: 10.1115/1.4007827 History: Received March 12, 2012; Revised October 06, 2012

This paper presents a methodology for obtaining the convective heat transfer coefficient from the wall of a heated aluminium plate, placed in a vertical channel filled with open cell metal foams. For accomplishing this, a thermal resistance model from literature for metal foams is suitably modified to account for contact resistance. The contact resistance is then evaluated using the experimental results. A correlation for the estimation of the contact resistance as a function of the pertinent parameters, based on the above approach is developed. The model is first validated with experimental results in literature for the asymptotic case of negligible contact resistance. A parametric study of the effect of different foam parameters on the heat transfer is reported with and without the presence of contact resistance. The significance of the effect of contact resistance in the mixed convection and forced convection regimes is discussed. The procedure to employ the present methodology in an actual case is demonstrated and verified with additional, independent experimental data.

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References

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Figures

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Fig. 4

Front sectional view of the test section with the physical model

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Fig. 3

Comparison of pore diameter with data in literature

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Fig. 2

Distribution of fiber diameter for aluminium and copper foams of 10 mm thickness

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Fig. 1

Distribution of pore diameter for aluminium and copper foams of 10 mm thickness

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Fig. 5

Simplified two dimensional model with the resistance network

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Fig. 6

Model prediction for data reported by Calmidi and Mahajan [3] and Cavallini et al. [15]

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Fig. 7

Reduction in Nusselt number with the presence of contact resistance

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Fig. 8

Model prediction with and without the presence of contact resistance for metal foams

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Fig. 9

Comparison of enhancement ratio with and without contact resistance

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Fig. 10

Agreement of model prediction with experiment for additional, independent data sets

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