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Research Papers: Porous Media

Numerical Investigation on the Effects of Pressure Drop on Thermal Behavior of Porous Burners

[+] Author and Article Information
M. Khosravy El-Hossaini, K. Mazaheri

Mechanical Engineering Department, Tarbiat Modares University, P.O. Box 14115-143, Tehran, Iran

M. Maerefat

Mechanical Engineering Department, Tarbiat Modares University, P.O. Box 14115-143, Tehran, Iranmaerefat@modares.ac.ir

J. Heat Transfer 130(3), 032601 (Mar 05, 2008) (5 pages) doi:10.1115/1.2804947 History: Received November 06, 2006; Revised June 26, 2007; Published March 05, 2008

This article aims to study the effect of pressure drop on the thermal behavior of porous burners. Since the reticulated ceramics are used in the burners’ construction, in the previous researches pressure drop arising from flow velocity was ignored. This research has showed that due to the increase of speed resulting from combustion, the consequence pressure drop creates considerable effects on the thermal performance of porous burners. To study this subject, the temperature of a point on the burner axis has been taken to be constant. The burned gas and exit surface temperature were obtained almost the same for two conditions, one with the pressure held constant and the other with a pressure drop. Results show that the firing rate was decreased up to 18%, compared to the constant pressure case. The thermal radiative efficiency of radiant porous burners, in which the pressure drop has been considered, was increased about 3–5% for the studied equivalence ratio of methane-air combustion.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic diagram of the studied burner

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Figure 2

Pressure drop across the burner for various equivalence ratios

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Figure 3

Gas and solid temperature at exit of the burner

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Figure 4

Gas temperature profile along burner axis for two mixture fractions

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Figure 5

Effect of pressure drop in burner firing rate

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Figure 6

Effect of pressure drop in burner’s radiant thermal efficiency

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