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Research Papers: Fundamental Issues and Canonical Flows

Characterization of Air Flow Through Sintered Metal Foams

[+] Author and Article Information
Oliver Reutter, Elena Smirnova, Jörg Sauerhering, Thomas Fend, Robert Pitz-Paal

 Institute of Technical Thermodynamics, DLR, Köln, Germany

Stefanie Angel

Department of Ferrous Metallurgy, Aachen University, 52060 Aachen, Germany

J. Fluids Eng 130(5), 051201 (Apr 25, 2008) (5 pages) doi:10.1115/1.2907419 History: Received December 18, 2006; Revised March 06, 2008; Published April 25, 2008

This study investigates air flow in metallic foams, which are produced by the slip reaction foam sintering (SRFS) process. It was conducted as part of the collaborative research center (SFB) 561 “Thermally Highly Loaded, Porous and Cooled Multi-Layer Systems for Combined Cycle Power Plants.” The flow through a porous medium is analyzed by Darcy’s equation with the Dupuit/Forchheimer extension. All measurements can be described very well by this equation and permeability and inertial coefficients are obtained for a large quantity of samples with different base materials and different porosities. A threshold porosity of 70% is observed, above which the pressure loss significantly starts sinking with porosity. Additionally, it was found that the permeability was anisotropic. Permeability is lower in the direction of gravity during foaming. Scattering in the data of the permeability and inertial coefficients versus the porosity is observed and discussed.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Scheme of the SRFS process

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Figure 2

Picture of a sample of a Hastelloy B foam and a detailed view of the pore structure

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Figure 3

Experimental setup for measuring the pressure drop of the samples (schematic)

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Figure 4

Sketch of the possible air flow directions in a cubic sample. Above and below can be distinguished in the sample, because of the direction of the gravity during the foaming and drying process.

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Figure 5

Pressure drop measurements of samples with different densities

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Figure 6

Pressure drop of a cubic Inconel 625 sample in six different directions

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Figure 7

Dependency of the permeability and inertial coefficients on the density of the Hastelloy B foam samples

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Figure 8

Comparison of the permeability coefficients sorted by matrix material

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Figure 9

Comparison of the inertial coefficients sorted by matrix material

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