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Article

Numerical Simulation of Heat Transfer and Fluid Flow of a Flat-Tube High Power Density Solid Oxide Fuel Cell

[+] Author and Article Information
Yixin Lu

 Department of Mechanical Engineering, University of Pittsburgh, Benedum Engineering Hall, Pittsburgh, PA 15261 pel1@pitt.eduyil5@pitt.edu

Laura Schaefer

 Department of Mechanical Engineering, University of Pittsburgh, Benedum Engineering Hall, Pittsburgh, PA 15261 pel1@pitt.edulaschaef@engr.pitt.edu

Peiwen Li

 Department of Mechanical Engineering, University of Pittsburgh, Benedum Engineering Hall, Pittsburgh, PA 15261 pel1@pitt.edu

J. Fuel Cell Sci. Technol 2(1), 65-69 (Sep 23, 2004) (5 pages) doi:10.1115/1.1843120 History: Received July 21, 2004; Revised September 17, 2004; Accepted September 23, 2004

To both increase the power density of a tubular solid oxide fuel cell (SOFC) and maintain its beneficial feature of secure sealing, a flat-tube high power density (HPD) solid oxide fuel cell is under development by Siemens Westinghouse, based on their formerly developed tubular model. In this paper, a three dimensional numerical model to simulate the steady state heat transfer and fluid flow of a flat-tube HPD–SOFC is developed. A computer code is programmed using the FORTRAN language to solve the governing equations for continuity, momentum, and energy conservation. The highly coupled temperature and flow fields of the air stream and the fuel stream inside and outside a typical channel of a one-rib flat-tube HPD–SOFC are investigated. This heat transfer and fluid flow results will be used to simulate the overall performance of a flat-tube HPD–SOFC in the near future, and to help optimize the design and operation of a SOFC stack in practical applications.

Copyright © 2004 by American Society of Mechanical Engineers
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Figures

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Figure 1

Configuration of a planar SOFC

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Figure 2

Cross section of a tubular SOFC

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Figure 3

Air and fuel delivery for a tubular SOFC

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Figure 4

Cross section of a flat-tube SOFC

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Figure 5

Air and fuel flow arrangement for a whole cell

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Figure 6

Computational domain (left channel)

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Figure 7

Air and fuel flow arrangement for left channel (A-A section in Fig. 6)

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Figure 8

Cross-sectional temperature field of the left channel (current density: 400A∕cm2)

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Figure 9

Cross-sectional temperature field of the left channel (current density: 300A∕cm2)

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Figure 10

Cross-sectional temperature field of the left channel (current density: 500A∕cm2)

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Figure 11

Temperature field of a typical cell stack surface 1 (current density: 400A∕cm2)

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Figure 12

Temperature field of a typical air tube surface 2 (current density: 400A∕cm2)

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Figure 13

Velocity field of the left channel A-A cross-section

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Figure 14

Velocity profile at the air introducing tube corner in the A-A cross section

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Figure 15

Fuel stream velocity profile of the leftmost channel of the A-A cross section

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Figure 16

Pressure drops in the fuel and air streams for different current densities

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