Thermal hydraulic behavior in the deteriorated turbulent heat transfer regime for a gas-cooled reactor

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One of the key issues in a gas-cooled system with a passive heat removal measure is the correct prediction of thermal hydraulic behavior in the deteriorated turbulent heat transfer (DTHT) regime. Here, a simple one-dimensional analysis of a gas-cooled reactor system was performed to show its strong potential for operation in the DTHT regime. A numerical calculation using computational fluid dynamics (CFD) was done to verify the capability of the Launder-Sharma (LS) turbulence model to predict wall and bulk temperatures while a gas system is operating in the DTHT regime. The results by the LS model are compared to those by the high Reynolds turbulent model, a newly proposed correlation, and recently obtained experimental data. The comparison shows that the LS turbulence model can provide a reasonable prediction in the buoyancy-induced DTHT regime. Additionally, it was found that the IS model predicted strong laminarization near the entrance which deteriorated turbulent heat transfer further compared to the measurements, but re-turbulization took place much earlier than in the experiment which recovered the heat transfer to a normal turbulent heat transfer. (C) 2009 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2010-04
Language
English
Article Type
Article
Keywords

MIXED CONVECTION; 2-EQUATION MODEL; VERTICAL TUBES; CIRCULAR TUBE; TRANSFER DTHT; AIR-FLOWS; UP-FLOW; PIPE; TEMPERATURE; VELOCITY

Citation

NUCLEAR ENGINEERING AND DESIGN, v.240, no.4, pp.783 - 795

ISSN
0029-5493
DOI
10.1016/j.nucengdes.2009.11.004
URI
http://hdl.handle.net/10203/101050
Appears in Collection
NE-Journal Papers(저널논문)
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