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Research Papers: Natural and Mixed Convection

Natural Convection Heat Transfer Enhancements From a Cylinder Using Porous Carbon Foam: Experimental Study

[+] Author and Article Information
Yorwearth L. Jamin

Department of Mechanical and Manufacturing Engineering, Schulich School of Engineering, CEERE,  University of Calgary, Calgary, AB, T2N 1N4, Canada

A. A. Mohamad

Department of Mechanical and Manufacturing Engineering, Schulich School of Engineering, CEERE,  University of Calgary, Calgary, AB, T2N 1N4, Canadamohamad@ucalgary.ca

J. Heat Transfer 130(12), 122502 (Sep 24, 2008) (6 pages) doi:10.1115/1.2977606 History: Received October 26, 2007; Revised March 17, 2008; Published September 24, 2008

The main objective of this experimental study is to quantify and compare the heat transfer enhancement of carbon foam and aluminum fins in natural convection. The study measures steady state heat transfer from a heated vertical pipe, with and without porous medium. The largest increase in Nusselt number was achieved by a solid carbon foam sleeve, which was about 2.5 times greater than a bare copper pipe.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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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 4

Comparison of experimental and empirical natural convection results

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Figure 5

(a) and (b) Variation of mean surface temperature (°C) and Nusselt number with Ra

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Figure 6

Radiation heat transfer versus Rayleigh number

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Figure 1

Schematic layout of the vertical pipe and data acquisition system

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