Enhanced Heat Transfer Using Porous Carbon Foam in Cross Flow—Part I: Forced Convection

[+] Author and Article Information
Yorwearth L. Jamin

Department of Mechanical and Manufacturing Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada

Abdulmajeed A. Mohamad1

Department of Mechanical and Manufacturing Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canadamohamad@ucalgary.ca


Corresponding author.

J. Heat Transfer 129(6), 735-742 (Aug 15, 2006) (8 pages) doi:10.1115/1.2717240 History: Received September 22, 2005; Revised August 15, 2006

Cogeneration of heat and power has become standard practice for many industrial processes. Research to reduce the thermal resistance in heat exchangers at the gas/solid interface can lead to greater energy efficiency and resource conservation. The main objective of this experimental study is to quantify and compare the heat transfer enhancement of carbon foam and aluminum fins. The study measures the heat transfer rate and pressure drop from a heated vertical pipe, with and without porous medium, in forced convection. The largest increase in Nusselt number was achieved by aluminum fins, which was about three times greater than the best carbon foam case.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 4

Comparison of experimental and empirical forced convection results for a bare pipe in cross flow

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Figure 1

Schematic layout of wind tunnel and DAQ

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Figure 2

Experimental apparatus and heat loss mechanisms

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Figure 3

(a)–(d) Geometric details of a bare copper pipe, aluminum fins, HTC sleeves, and HTC fins, respectively

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Figure 5

Repeated measurement of surface temperature to confirm consistency of temperature measurements

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Figure 6

(a)–(c) Variation of mean surface temperature (°C), mean Nusselt number, and pressure drop with Re, respectively

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Figure 7

Experimental apparatus for HTC foam conductivity analysis

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Figure 8

Pressure drop versus Dacry velocity in HTC foam sample

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Figure 9

Schematic of apparatus for gas permeability measurement



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