PREDICTION OF A HEAT TRANSFER TO CO₂ FLOWING IN AN UPWARD PATH AT A SUPERCRITICAL PRESSURE
This study was performed to evaluate the prediction capability of a commercial CFD code and to investigate the effects of different geometries such as a 4.4 mm tube and an 8/10 mm annular channel on the detailed flow structures. A numerical simulation was performed for the conditions, at which the e...
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Veröffentlicht in: | Nuclear engineering and technology 2009, 41(7), , pp.907-920 |
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Sprache: | eng |
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Zusammenfassung: | This study was performed to evaluate the prediction capability of a commercial CFD code and to investigate the effects of
different geometries such as a 4.4 mm tube and an 8/10 mm annular channel on the detailed flow structures. A numerical simulation
was performed for the conditions, at which the experimental data was produced by the test facility SPHINX. A 2-dimensional axisymmetric
steady flow was assumed for computational simplicity. The RNG k-ε
turbulence model (RNG) with an enhanced wall
treatment option, SST k-ω (SST) and low Reynolds Abid turbulence model (ABD) were employed and the numerical predictions
were compared with the experimental data generated from the experiment. The effects of the geometry on heat transfer were
investigated. The flow and temperature fields were also examined in order to investigate the mechanism of heat transfer near the
wall. The local heat transfer coefficient predicted by the RNG model is very close to the measurement result for the tube. In contrast,
the local heat transfer coefficient predicted by the SST and ABD models is closer to the measurement for the annular channel. KCI Citation Count: 7 |
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ISSN: | 1738-5733 2234-358X |
DOI: | 10.5516/NET.2009.41.7.907 |