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TECHNICAL PAPERS: Combustion

Combustion-Thermoelectric Tube

[+] Author and Article Information
C.-W. Park, M. Kaviany

Department of Mechanical Engineering, The University of Michigan, Ann Arbor, MI 48109-2125

J. Heat Transfer 122(4), 721-729 (Jun 05, 2000) (9 pages) doi:10.1115/1.1318210 History: Received February 20, 1999; Revised June 05, 2000
Copyright © 2000 by ASME
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Figures

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(a) A schematic of the combustion-thermoelectric tube; (b) thermal nodal model of the combustion-thermoelectric tube.
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(a) Tube-bundle module of the combustion-thermoelectric energy converter; (b) electrical circuit for the combustion-thermoelectric energy converter
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Typical axial distributions of normalized gas and solid temperatures, reaction rate, and product species mass fraction. ZeTo=0.59,Re,o*=1, τc=10 s,〈u〉g,o=0.75 m/s,D1=1.3 mm,ls=0.6 mm,LTE=60 mm,LC=7.5 mm,CTE=1908.8,CC=3236.0,kTE*=75,kC*=523.6,Φ=0.414.
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Effect of the cycle period τc on the conversion efficiency and the junction temperatures. ZeTo=0.59,Re,o*=1,〈u〉g,o=0.75 m/s,D1=1.3 mm,ls=0.6 mm,LTE=60 mm,LC=7.5 mm,CTE=1908.8,CC=3236.0,kTE*=75,kC*=523.6,Φ=0.414.
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Effect of the gas velocity 〈u〉g,o on the conversion efficiency and the junction temperatures. ZeTo=0.59,Re,o*=1,τc=10 s,D1=1.3 mm,ls=0.6 mm,LTE=60 mm,LC=7.5 mm,CTE=1908.8,CC=3236.0,kTE*=75,kC*=523.6,Φ=0.414.
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Effect of the combustion region length LC on the conversion efficiency and the junction temperatures. ZeTo=0.59,Re,o*=1,τc=10 s,〈u〉g,o=0.75 m/s,D1=1.3 mm,ls=0.6 mm,LTE=60 mm,CTE=1908.8,CC=3236.0,kTE*=75,kC*=523.6,Φ=0.414.
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Effect of the stoichiometric ratio Φ on the conversion efficiency and the hot junction temperature, for various tube wall thicknesses. ZeTo=0.59,Re,o*=1,τc=10 s,〈u〉g,o=0.75 m/s,D1=1.3 mm,LTE=60 mm,LC=7.5 mm,CTE=1908.8,CC=3236.0,kTE*=75,kC*=523.6.
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Effect of the thermoelectric region length LTE on the conversion efficiency and the junction temperatures. ZeTo=0.59,Re,o*=1,τc=10 s,〈u〉g,o=0.75 m/s,D1=1.3 mm,ls=0.6 mm,LC=7.5 mm,CTE=1908.8,CC=3236.0,kTE*=75,kC*=523.6,Φ=0.414.
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Effect of the diameter D1 of the thermoelectric regions on the conversion efficiency and the junction temperatures. ZeTo=0.59,Re,o*=1,τc=10 s,〈u〉g,o=0.75 m/s,ls=0.6 mm,LTE=60 mm,LC=7.5 mm,CTE=1908.8,CC=3236.0,kTE*=75,kC*=523.6,Φ=0.414.
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Effect of the tube thickness ls on the conversion efficiency and the junction temperatures. ZeTo=0.59,Re,o*=1,τc=10 s,〈u〉g,o=0.75 m/s,D1=1.3 mm,LTE=60 mm,LC=7.5 mm,CTE=1908.8,CC=3236.0,kTE*=75,kC*=523.6,Φ=0.414.
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Effect of the dimensionless external resistance Re,o* on the conversion efficiency and the junction temperatures. ZeTo=0.59,τc=10 s,〈u〉g,o=0.75 m/s,D1=1.3 mm,ls=0.6 mm,CTE=1908.8, CC=3236.0,LTE=60 mm,LC=7.5 mm,kTE*=75,kC*=523.6,Φ=0.414.
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Effect of the thermal conductivity kTE of the thermoelectric region on the conversion efficiency and the junction temperatures. Re,o*=1,τc=10 s,〈u〉g,o=0.75 m/s,D1=1.3 mm,ls=0.6 mm,CTE=1908.8,CC=3236.0,LTE=60 mm,LC=7.5 mm,kC*=523.6,Φ=0.414.
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Effect of the stoichiometric ratio Φ on the conversion efficiency and the hot junction temperature, for various tube wall thicknesses for low thermal conductivity material (Bi2Te3).ZeTo=1.58,Re,o*=1, τc=10 s,〈u〉g,o=0.75 m/s,D1=0.63 mm,LTE=60 mm,LC=7.5 mm,CTE=1908.8,CC=3236.0,kTE*=28,kC*=523.6.

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