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RESEARCH PAPERS: Forced Convection

Forced and Free Flow in a Vertical Annular Duct Under Nonaxisymmetric Conditions

[+] Author and Article Information
A. Barletta, S. Lazzari

Università di Bologna, Dipartimento di Ingegneria Energetica, Nucleare e del Controllo Ambientale (DIENCA), Laboratorio di Montecuccolino, Via dei Colli, 16, I-40136 Bologna, Italy

J. Heat Transfer 127(6), 606-613 (Jun 06, 2005) (8 pages) doi:10.1115/1.1863277 History: Received November 13, 2004; Revised November 25, 2004; Online June 06, 2005
Copyright © 2005 by ASME
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References

Figures

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Vertical annular duct and coordinate axes
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First example: section of the annular duct with prescribed thermal boundary conditions  
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Flow reversal regions as a function of γ
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Three-dimensional plot of the dimensionless velocity distribution u(r,ϑ), for γ=0.5 and Gr/Re=1500  
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Second example: section of the annular duct with prescribed thermal boundary conditions
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Flow reversal regions as a function of γ
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Regions of positive and/or negative values of the dimensionless pressure drop parameter λ
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Three-dimensional plot of the dimensionless velocity distribution u(r,ϑ), for γ=0.5 and Gr/Re=500

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