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EXPERIMENTAL INVESTIGATION OF HEAT TRANSFER AND PRESSURE DROP IN POROUS METAL FOAMS

Reutter, Oliver and Smirnova, Elena and Sauerhering, Jörg and Angel, Stefanie and Fend, Thomas and Pitz-Paal, Robert (2006) EXPERIMENTAL INVESTIGATION OF HEAT TRANSFER AND PRESSURE DROP IN POROUS METAL FOAMS. In: Proceedings. 4th International Conference on Nanochannels, Microchannels and Minichannels, 2006-06-19, Limerick, Ireland. ISBN 0-7918-3778-5.

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Abstract

Metal foams made by the SlipReactionFoamSintering (SRFS)-process are investigated. In these foams the pores are produced by a reaction between iron and a weak acid. The generated hydrogen forms pores in a metal powder slurry. These pores remain in the foam after sintering. Also secondary pores are found in these foams because of the sintering of the metal powder slurry. The metal powder base of the foams is Inconel 625 and Hastelloy B. Foam samples with a variety of different porosities of the two metals in the range of about 62 % to 87 % are used as well as samples made out of sintered metal powder which were not foamed with porosities of around 50 %. The motivation for this study is to use these foams as combustion chamber walls in gas fired power plants. By using porous walls effusion cooling can be applied to keep the wall temperatures low. Air is used as a fluid to study the flow characteristics of these samples. Their pressure drop with air at room temperature is measured in the range of velocities of up to around 1 m/s. The parameters characterizing the foams are obtained using the Darcy-Forchheimer equations resulting in the permeability and the inertial coefficients. The dependency on the porosity is discussed. The volumetric heat transfer is measured for the foams by a transient method based on an air flow with a sinusoidal temperature wave, which is attenuated by the sample. The obtained volumetric heat transfer coefficients are discussed and transferred to Nu-Re correlations. Correlations between the heat transfer coefficients and the pressure drop coefficients are made.

Document Type:Conference or Workshop Item (Speech)
Title:EXPERIMENTAL INVESTIGATION OF HEAT TRANSFER AND PRESSURE DROP IN POROUS METAL FOAMS
Authors:
AuthorsInstitution or Email of Authors
Reutter, OliverUNSPECIFIED
Smirnova, ElenaUNSPECIFIED
Sauerhering, JörgUNSPECIFIED
Angel, StefanieInstitut für Eisenhüttenkunde, RWTH Aachen
Fend, ThomasUNSPECIFIED
Pitz-Paal, RobertUNSPECIFIED
Date:19 June 2006
Journal or Publication Title:Proceedings
Refereed publication:Yes
In ISI Web of Science:No
Editors:
EditorsEmail
ASME, UNSPECIFIED
Series Name:Order No. I745CD
ISBN:0-7918-3778-5
Keywords:metal foam, pressure loss, volumetric heat transfer
Event Title:4th International Conference on Nanochannels, Microchannels and Minichannels
Event Location:Limerick, Ireland
Event Type:international Conference
Event Dates:2006-06-19
Organizer:ASME
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:E SF - Solar research (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Applikationsentwicklung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Technical Thermodynamics > Solar Research
Deposited By: Oliver Reutter
Deposited On:04 Jan 2007
Last Modified:12 Dec 2013 20:22

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