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http://dx.doi.org/10.3795/KSME-B.2003.27.12.1724

Assessment of Explicit Algebraic Stress/Heat-Flux Models for Reduction of Heat Transfer in a Vertical Pipe with Intense Heating  

Baek, Seong-Gu (한국과학기술원 항공우주공학과)
Park, Seung-O (한국과학기술원 항공우주공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.27, no.12, 2003 , pp. 1724-1733 More about this Journal
Abstract
This paper assesses the prediction performance of explicit algebraic stress and heat-flux models for reduction of heat transfer coefficient in a strongly-heated vertical tube. Two explicit algebraic stress models and four explicit algebraic heat-flux models are selected for assessment. Eight combinations of explicit algebraic stress and heat-flux models are used in predicting the turbulent gas flows with intense heating, which yields the significant property-variation. The results showed that the two combinations of GS-AKN and WJ-mAKN predicted the Nusselt number and the axial wall temperature variations well and that the predictions of Nusselt number with WJ-combinations spread in a wider range than those with Gs-combinations. WJ is the explicit algebraic stress model of Wallin and Johansson and GS is the model of Gatski and Speziale and that AKN is the explicit heat-flux model of Abe, Kondoh and Nagano and mAKN is the modified AKN.
Keywords
Mixed Convection; Reduction; Heat Transfer; High Heating; Property Variation; Explicit Algebraic Stress Model; Explicit Algebraic Heat-Flux Model; Vertical Tube;
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