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Fifth International Symposium on Turbulence and Shear Flow Phenomena
August, 27-29, 2007, Technische Universität München, Munich, Germany

DOI: 10.1615/TSFP5

PERFORMANCE OF TURBULENCE MODELS IN PREDICTING HEAT TRANSFER TO CO2 AT SUPERCRITICAL PRESSURE – COMPARISONS WITH DIRECT NUMERICAL SIMULATIONS

pages 579-584
DOI: 10.1615/TSFP5.890
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要約

Computational simulations of selected cases from the recent direct numerical simulation (DNS) investigation of Bae et al. (2005) of variable property mixed convection heat transfer to CO2 at supercritical pressure flowing in a vertical tube have been performed using an 'in house' code which was written for two-dimensional elliptic developing flow and heat transfer using the Reynolds averaged conservation equations. The objective of the study is to evaluate the performance of low Reynolds number turbulence models in predicting mixed convection heat transfer, especially paying attention to the features which enable them to respond to the modification of the turbulence field due to influences of flow acceleration and buoyancy. It has been found that a group of turbulence models which were previously found reproducing closely mixed convection under conditions of constant properties do not perform well due to an over-response to changes in the flow. Models which were less successful previously perform better. The V2F model performs the best among all models tested. It is also shown that the inability of the modelling of the axial turbulent heat flux is responsible for the slow recovery of heat transfer in model predictions for strongly buoyancy-influenced flows.

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