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TECHNICAL PAPERS: Gas Turbines: Ceramics

Characterization of Porous Carbon Foam as a Material for Compact Recuperators

[+] Author and Article Information
A. G. Straatman

Department of Mechanical and Materials Engineering, The University of Western Ontario, London, Ontario, N6A 5B9 Canada and  Thermalcentric Inc., London, Ontario, Canada

N. C. Gallego

Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831

Q. Yu, B. E. Thompson

 Thermalcentric Inc., London, Ontario, N6G 4K1 Canada

J. Eng. Gas Turbines Power 129(2), 326-330 (Jun 28, 2006) (5 pages) doi:10.1115/1.2436562 History: Received June 12, 2006; Revised June 28, 2006

Experiments are presented to quantify the convective heat transfer and hydrodynamic loss that is obtained by forcing water through blocks of porous carbon foam (PCF) heated from one side. The experiments were conducted in a small-scale water tunnel instrumented to measure the pressure drop and temperature rise of the water passing through the blocks and the base temperature and heat flux into the foam block. In comparison to similar porosity aluminum foam, the present results indicate that the pressure drop across the porous carbon foam is higher due to the large hydrodynamic loss associated with the cell windows connecting the pores, but the heat transfer performance suggests that there may be a significant advantage to using PCF over aluminum foam for extended surface convection elements in recuperators and electronic cooling devices.

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Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Scanning electron microscope images of the porous carbon foam specimens tested

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Figure 2

Schematic of experimental setup showing the position and orientation of the carbon foam, the fluid inlet and outlet, and the heat input

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Figure 3

Plot showing the pressure drop as a function of Reynolds number for the three foam specimens considered. The symbols are measured data and the curves are generated from Eq. 1, with the values of permeability and form drag summarized in Table 2.

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Figure 4

Plot showing the thermal resistance as a function of the filter velocity v for the foam specimens tested

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Figure 5

Plot showing the Nusselt number (based on Dhyd and Ab) as a function of the filter velocity v

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Figure 6

Plot showing the Nusselt number as a function of Re (based on De and Aeff) for the three foams considered

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