This work is focused on the study of phenomena involved in heat transfer to fluids at pressures higher than the critical value and on the ability of RANS turbulence models available in CFD codes to reproduce them correctly. The study is performed mostly using the STARCCM+ code and, in a few cases, FLUENT. A relatively broad set of experimental data is analyzed, for water and carbon dioxide flowing in vertical pipes, of different diameters and lengths, at various operating conditions. The comparison between experimental data and calculated values is made mainly on the basis of the values of temperature at the inner surface of the wall. The experimental data addressed are characterized by phenomena which are typical of fluids at supercritical pressure, with heat transfer, namely enhancement and deterioration of heat transfer. The range of reasonable capability of the models which are available is found to be quite limited over the range of experimental conditions covered.

Capabilities of Two-Equation Low-Reynolds Number Turbulence Models in Predicting Heat Transfer to Fluids at Supercritical Pressure

AMBROSINI, WALTER;FORGIONE, NICOLA;
2013

Abstract

This work is focused on the study of phenomena involved in heat transfer to fluids at pressures higher than the critical value and on the ability of RANS turbulence models available in CFD codes to reproduce them correctly. The study is performed mostly using the STARCCM+ code and, in a few cases, FLUENT. A relatively broad set of experimental data is analyzed, for water and carbon dioxide flowing in vertical pipes, of different diameters and lengths, at various operating conditions. The comparison between experimental data and calculated values is made mainly on the basis of the values of temperature at the inner surface of the wall. The experimental data addressed are characterized by phenomena which are typical of fluids at supercritical pressure, with heat transfer, namely enhancement and deterioration of heat transfer. The range of reasonable capability of the models which are available is found to be quite limited over the range of experimental conditions covered.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/225565
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