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

Reutter, Oliver und Smirnova, Elena und Sauerhering, Jörg und Angel, Stefanie und Fend, Thomas und 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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Kurzfassung

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.

Dokumentart:Konferenzbeitrag (Vortrag)
Titel:EXPERIMENTAL INVESTIGATION OF HEAT TRANSFER AND PRESSURE DROP IN POROUS METAL FOAMS
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Reutter, OliverNICHT SPEZIFIZIERT
Smirnova, ElenaNICHT SPEZIFIZIERT
Sauerhering, JörgNICHT SPEZIFIZIERT
Angel, StefanieInstitut für Eisenhüttenkunde, RWTH Aachen
Fend, ThomasNICHT SPEZIFIZIERT
Pitz-Paal, RobertNICHT SPEZIFIZIERT
Datum:19 Juni 2006
Erschienen in:Proceedings
Referierte Publikation:Ja
In ISI Web of Science:Nein
Herausgeber:
HerausgeberInstitution und/oder E-Mail-Adresse der Herausgeber
ASME, NICHT SPEZIFIZIERT
Name der Reihe:Order No. I745CD
ISBN:0-7918-3778-5
Stichwörter:metal foam, pressure loss, volumetric heat transfer
Veranstaltungstitel:4th International Conference on Nanochannels, Microchannels and Minichannels
Veranstaltungsort:Limerick, Ireland
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2006-06-19
Veranstalter :ASME
HGF - Forschungsbereich:Energie
HGF - Programm:Erneuerbare Energie
HGF - Programmthema:E SF - Solarforschung (alt)
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E SF - Solarforschung
DLR - Teilgebiet (Projekt, Vorhaben):E - Applikationsentwicklung (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Technische Thermodynamik > Solarforschung
Hinterlegt von: Oliver Reutter
Hinterlegt am:04 Jan 2007
Letzte Änderung:12 Dez 2013 20:22

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