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Research Papers: Combustion and Reactive Flows

Numerical Predictions of Hydrogen-Air Rectangular Channel Flows Augmented by Catalytic Surface Reactions

[+] Author and Article Information
Ryoichi S. Amano

Mohsen M. Abou-Ellail

Mechanical Engineering Department,  University of Wisconsin-Milwaukee, Milwaukee, WI 53201abouellail@hotmail.com

S. Kaseb

Mechanical Engineering Department,  Cairo University, Cairo 12613, Egyptkaseb@pathways.edu.eg

J. Heat Transfer 134(4), 041201 (Feb 13, 2012) (10 pages) doi:10.1115/1.4005202 History: Received October 29, 2010; Revised September 24, 2011; Published February 13, 2012; Online February 13, 2012

Catalytic combustion of hydrogen-air boundary layers involves the adsorption of hydrogen and oxygen into a platinum-coated surface, chemical reactions of the adsorbed species, and the desorption of the resulting products. Re-adsorption of some produced gases is also possible. This paper presents numerical computations of laminar momentum transfer, heat transfer, and chemical reactions in rectangular channel flows of hydrogen-air mixtures. Chemical reactions are included in the gas phase as well as on the solid platinum surfaces. In the gas phase, eight species are involved in 26 elementary reactions. On the platinum hot surfaces, additional surface species are included, which are involved in 16 additional surface chemical reactions. The platinum surface temperature distribution is prespecified, while the properties of the reacting flow are computed. The results show very good agreement with the measured data.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Layout of the configuration of reacting hydrogen-air mixture flow inside platinum-coated rectangular channel

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Figure 2

Catalytic surface temperature profile for the channel flow of Appel [15]

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Figure 3

Transverse temperature profiles at streamwise distances of 25 mm, 85 mm, 105 mm, 165 mm, 235 mm, and 265 mm

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Figure 4

Mole fractions of H2 and H2 O at streamwise distances of 25 mm, 85 mm, 105 mm, 165 mm, 235 mm, and 265 mm

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Figure 5

Mole fraction of O2 at streamwise distances of 25 mm, 85 mm, 105 mm, 165 mm, 235 mm, and 265 mm

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Figure 6

Streamwise velocity, u, at streamwise distances of 25 mm, 85 mm, 105 mm, 165 mm, 235 mm, and 265 mm

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Figure 7

Transverse velocity, v, at streamwise distances of 25 mm, 85 mm, 105 mm, 165 mm, 235 mm, and 265 mm

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Figure 8

Mole fraction of OH at streamwise distances of 25 mm, 85 mm, 105 mm, 165 mm, 235 mm, and 265 mm

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Figure 9

Mole fraction of H at streamwise distances of 25 mm, 85 mm, 105 mm, 165 mm, 235 mm, and 265 mm

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Figure 10

Mole fraction of O at streamwise distances of 25 mm, 85 mm, 105 mm, 165 mm, 235 mm, and 265 mm

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Figure 11

Mole fraction of H2 O2 at streamwise distances of 25 mm, 85 mm, 105 mm, 165 mm, 235 mm, and 265 mm

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Figure 12

Mole fraction of HO2 at streamwise distances of 25 mm, 85 mm, 105 mm, 165 mm, 235 mm, and 265 mm

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Figure 13

Surface production rate of H2 O and Surface consumption rates of H2 and O2

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Figure 14

Surface coverage of surface species for 0 < x < 5 mm

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Figure 15

Surface coverage of surface species for the total channel length (0 < x > 300 mm)

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Figure 16

Streamwise pressure difference profile (p-pin)

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