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research-article

Heat Transfer During High Temperature Gas Flow Through Metal Foam Heat Exchangers

[+] Author and Article Information
Pakeeza Hafeez

Department of Mechanical and Industrial Engineering, University of Toronto, 5 Kings College Road, Toronto, ON, M5S3G8
hafeez.pakeeza@gmail.com

Sanjeev Chandra

Department of Mechanical and Industrial Engineering, University of Toronto, 5 Kings College Road, Toronto, ON, M5S3G8
chandra@mie.utoronto.ca

Javad Mostaghimi

Department of Mechanical and Industrial Engineering, University of Toronto, 5 Kings College Road, Toronto, ON, M5S3G8
mostag@mie.utoronto.ca

1Corresponding author.

ASME doi:10.1115/1.4037082 History: Received October 03, 2016; Revised June 02, 2017

Abstract

An experimental study of heat transfer in metal foam heat exchangers fabricated from 10 and 40 pores per inch (PPI) was conducted. Heat exchangers were made by either brazing Inconel sheets to foam or plasma spraying Inconel skins on the foam. A burner test rig was built to produce high temperature combustion gases at either 550 °C or 750 °C that were passed over the exposed surface of heat exchangers that were cooled by passing air through them at rates of up to 200 SLPM. Both pressure drop and temperature rise of the air were measured. Friction factors and volumetric heat transfer coefficients were calculated for air velocities varying from 0.1 to 5 m/s and dimensionless correlations to predict these derived. Heat exchangers with 40 PPI foam had higher heat transfer rates than those with 10 PPI foam, but also larger pressure drops. Thermal sprayed heat exchangers were found to perform better than those that were brazed since they had lower thermal contact resistance between the external shell and foam struts. An analytical model was developed assuming local thermal non-equilibrium (LTNE) and predictions from model were found to be in good agreement with experimental results.

Copyright (c) 2017 by ASME
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