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RESEARCH PAPERS

Evaluation of Turbulence Models for Thermal Striping in a Triple Jet

[+] Author and Article Information
Seok-Ki Choi1

Fluid System Engineering Division, Korea Atomic Energy Research Institute, 150 Deokjin-dong, Yuseong-gu, Daejeon 305-353, Koreaskchoi@kaeri.re.kr

Seong-O Kim

Fluid System Engineering Division, Korea Atomic Energy Research Institute, 150 Deokjin-dong, Yuseong-gu, Daejeon 305-353, Korea

1

Corresponding author.

J. Pressure Vessel Technol 129(4), 583-592 (Oct 29, 2006) (10 pages) doi:10.1115/1.2767337 History: Received March 16, 2006; Revised October 29, 2006

A computational study for an evaluation of the current turbulence models for the prediction of a thermal striping in a triple jet is performed. The tested turbulence models are the two-layer model, the shear stress transport model, and the elliptic relaxation model. These three turbulence models are applied to the prediction of a thermal striping in a triple jet in which detailed experimental data are available. The predicted time-averaged and root-mean-square values of the temperature are compared with the experimental data, and the capability of predicting the oscillatory behavior of the ensemble-averaged temperature is investigated. From these works, it is shown that only the elliptic relaxation model is capable of predicting the oscillatory behavior of the ensemble-averaged temperature. It is also shown that the elliptic relaxation model predicts best the time-averaged temperature and the root mean square of the temperature fluctuation. However, this model predicts a slower mixing at the far downstream of the jet.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 4

The power spectrum density diagrams at one monitoring point (x=−25mm, y=223mm); (a) experiment, and (b) V2-f model

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Figure 1

The views of the experimental apparatus; (a) top view and (b) front view

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Figure 2

The solution domain and coordinate system

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Figure 3

The time variation of temperature at one monitoring location (x=−25mm, y=223mm); (a) two-layer model, (b) SST model, (c) V2-f model, and (d) experiment

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Figure 5

The predicted time-averaged vertical velocity profiles: (solid, SST; dash-dot, two layer; dash-dot-dot, V2f). (a) y=48mm, (b) =98mm, (c) y=123mm, (d) y=223mm, (e) y=273mm, and (f) y=373mm.

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Figure 6

The predicted Reynolds shear stress profiles: (solid, SST; dash-dot, two layer; dash-dot-dot, V2f). (a) y=48mm, (b) =98mm, (c) y=123mm, (d) y=223mm, (e) y=273mm, and (f) y=373mm.

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Figure 7

The predicted time-averaged temperature profiles: (solid, SST; dash-dot, two layer; dash-dot-dot, V2f). (a) y=48mm, (b) =98mm, (c) y=173mm, (d) y=273mm, (e) y=373mm, and (f) y=523mm.

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Figure 8

The predicted root-mean-square of temperature profiles: (solid, SST; dash-dot, two layer; dash-dot-dot, V2f). (a) y=48mm, (b) =98mm, (c) y=173mm, (d) y=273mm, (e) y=373mm, and (f) y=523mm.

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