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Início - ICHMT DL Ano atual Arquivos Comitê executivo Centro Internacional para Transferência de Calor e Massa

The effect of RANS turbulence modeling on numerical analysis of flowmeter accuracy

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.2270
pages 2203-2211

N. S. Kim
Reactor System Performance Department, Korea Institute of Nuclear Safety, 62 Gwahak-ro, Yuseong-gu, Daejeon 305-338, Repulblic of Korea

S. K. Lee
Reactor System Performance Department, Korea Institute of Nuclear Safety, 62 Gwahak-ro, Yuseong-gu, Daejeon 305-338, Repulblic of Korea

K. W. Seul
Safety Issue Research Department, Korea Institute of Nuclear Safety, 62 Gwahak-ro, Yuseong-gu, Daejeon 305-338, Repulblic of Korea

Y. J. Choi
Reactor System Performance Department, Korea Institute of Nuclear Safety, 62 Gwahak-ro, Yuseong-gu, Daejeon 305-338, Repulblic of Korea

Resumo

The present paper aims at drawing up recommendations for choosing appropriate turbulence models and near wall treatment to well describe flow characteristics through the orifice plate in the auxiliary feedwater system (AFWS) of nuclear power plant. Six different types of RANS (Reynolds Averaged Navier-Stokes) turbulence models and two types of near wall treatment were evaluated using commercial computational fluid dynamics (CFD) code, Fluent v.6.2. Additionally, the influence on accuracy of flow rate under position of the orifice flowmeter in AFWS was investigated by analyzing the characteristics of turbulent flow through the orifice. In this preliminary study, the realizable k-ε and Reynolds stress model with the enhanced wall treatment were suitable for analyzing flow characteristics near orifice plate, and the results had a good agreement with experimental data. And the current installation of the orifice flowmeter in AFWS needs a more straight upstream pipeline, which is more than 30D, to avoid the flow disturbance which can cause the distortion in the velocity profile and to measure accurate flow rates.

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