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TECHNICAL BRIEFS

Assessment of a Second-Moment Closure Model for Strongly Heated Internal Gas Flows

[+] Author and Article Information
Robert E. Spall

Department of Mechanical and Aerospace Engineering, Utah State University, Logan, UT 84322-4130spall@engineering.usu.edu

Eugen Nisipeanu

 Fluent, Inc., 1007 Church St., Evanston, IL 60201en@evanston.fluent.com

Adam Richards

 Advanced Engineering & Sciences, 5009 Centennial Boulevard, Colorado Springs, CO 80919Adamh_richards@hotmail.com

J. Heat Transfer 129(12), 1719-1722 (Apr 10, 2007) (4 pages) doi:10.1115/1.2768098 History: Received January 18, 2007; Revised April 10, 2007

Both low- and high-Reynolds-number versions of the stress-ω model of Wilcox (Turbulence Modeling for CFD, 2nd ed., DCW Industries, Inc.) were used to predict velocity and heat transfer data in a high-heat-flux cylindrical tube for which fluid properties varied strongly with temperature. The results indicate that for accurate heat transfer calculations under the conditions considered in this study, inclusion of low-Reynolds-number viscous corrections to the model are essential. The failure of the high-Reynolds-number model to accurately predict the wall temperature was attributed to an overprediction of the near-wall velocity.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Comparison between predicted wall temperatures and experimental data 5

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Figure 2

Comparison between predicted and experimental mean velocity profiles 5 at x∕D=24.5: (a) Run 618, (b) Run 635, and (c) Run 445

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Figure 3

Comparison between predicted and experimental 5 mean temperature profiles at x∕D=24.5: (a) Run 618, (b) 635, and (c) Run 445

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