NDLI: Characterisation of Flow and Heat Transfer in Sintered Metal Foams

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Sauerhering, Jo¨rg Angel, Stefanie Fend, Thomas Brendelberger, Stefan Smirnova, Elena Pitz-Paal, Robert
Copyright Year	2008
Abstract	Since sintered metal foam is an innovative material with promising properties such as high porosity, good thermal conductivity, beneficial mechanical properties like strength and weldability, it has been considered to be applied as an open porous wall element in combustion chambers of gas turbines. In this application, the foam serves as a functional material capable to lead cooling air through micro- and minichannels into the inside of the combustion chamber. This cooling technique also known as effusion cooling keeps the combustion chamber walls below critical temperatures and therefore enables the burning process to be more effectively operated at higher temperatures. For a proper design of the wall element, the temperature distribution along the path of the fluid inside the foam must be known. For an exact calculation of the temperature flow and heat transfer processes inside the foam must be known. Therefore in this study the permeability and heat transfer properties of the foam have been characterized experimentally. The methods are described and the results in terms of permeability coefficients, convective heat transfer coefficients and effective thermal conductivity are presented as functions of the foam’s porosity. The method of the calculation is described and finally, the results of the calculation are presented, showing that due to the fine grained structure of the foam, the heat transfer from the solid to the cooling fluid takes place in a thin layer close to the inner surface of the camber wall.
Sponsorship	Nanotechnology Institute
Starting Page	121
Ending Page	127
Page Count	7
File Format	PDF
ISBN	0791848345
DOI	10.1115/ICNMM2008-62311
e-ISBN	0791838269
Conference Proceedings	ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels
Language	English
Publisher Date	2008-06-23
Publisher Place	Darmstadt, Germany
Access Restriction	Subscribed
Subject Keyword	Metal foams Temperature distribution Temperature Cooling Mechanical properties Combustion Permeability Flow (dynamics) Convection Functional materials Design Fluids Gas turbines Thermal conductivity Porosity Combustion chambers Heat transfer
Content Type	Text
Resource Type	Article

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