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Technical Briefs

Heat Transfer Enhancement From a Blade Tip-Cap Using Metal Foams

[+] Author and Article Information
Owen Sengstock

 School of Mechanical and Mining Engineering, The University of Queensland, Queensland 4072, Australia

Kamel Hooman1

 School of Mechanical and Mining Engineering, The University of Queensland, Queensland 4072, Australiak.hooman@uq.edu.au

1

Corresponding author.

J. Heat Transfer 134(11), 114505 (Sep 28, 2012) (3 pages) doi:10.1115/1.4007134 History: Received November 08, 2011; Revised May 17, 2012; Published September 26, 2012; Online September 28, 2012

3D numerical results are presented to compare the heat transfer augmentation from a plate by using pin fins and metal foams. It is observed that maximizing the inlet velocity and pores per inch maximizes the overall heat transfer rate. The thickness of the foam layer has minimal effect on overall rates of heat transfer, but great effect on the maximum plate temperature. It has been shown that an optimum thickness exists which minimizes the hot spot temperature. Hot spots are generally located in the corners where velocities are the lowest. While the pressure drop remains almost unaltered, the heat transfer increases by 146% and 12% compared with a smooth channel and the optimal pin-fin data available in the literature, respectively. Interestingly, the additional mass of the foams, to achieve this performance, is approximately one-quarter of the best pin-fin sink quoted above.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic description of the problem: (a) Isometric with shaded outlet cross section and (b) side view

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Figure 2

Total pressure drop for smooth, pin-finned, and foamed (40 PPI with different porosity and thickness layer) channel

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Figure 3

Maximum tip-cap temperature versus foam thickness for 40PPI and 0.97 foam porosity

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Figure 4

Nusselt number versus Reynolds number for a 90% porous foam layer of 5 mm thickness with different PPI values

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