Assessment of performance of turbulence models in predicting supercritical pressure heat transfer in a vertical tube

S. He, W. S. Kim, J. H. Bae

Research output: Contribution to journalArticle

135 Citations (Scopus)

Abstract

Computational simulations of heat transfer to fluids at a supercritical pressure have been performed using ail 'in-house' CFD code written for two-dimensional axisymmetric flow and heat transfer based oil the Favre averaging approach. Results are compared with recently available direct numerical simulations (DNS) which provide a benchmark dataset ideal for model assessment. The objective of the present study is to evaluate the performance of low-Reynolds number turbulence models in predicting mixed convection heat transfer to fluids at supercritical pressure, especially paying attention to the features which enable them to respond to the modifications 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 closely reproducing mixed convection under conditions of constant properties do not perform well for flows considered in the present study due to ail 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. For strong-buoyancy-influenced cases, most models are able to reproduce turbulence recovery reasonably well but not the improvement oil heat transfer. This is attributed, at least partly, to the inability of turbulence models in reproducing turbulent heat flux using a constant turbulent Prandtl number. The influence of the lack of a suitable description of the axial turbulent heat flux has been shown to be insignificant except immediately after the commencement of heating. (c) 2008 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)4659-4675
Number of pages17
JournalInternational Journal of Heat and Mass Transfer
Volume51
Issue number19-20
Early online date9 May 2008
DOIs
Publication statusPublished - Sep 2008

Keywords

  • supercritical pressure
  • mixed convection
  • buoyancy
  • acceleration
  • heat transfer deterioration
  • carbon-dioxide
  • numerical-analysis
  • mini/micro channels
  • circular tubes
  • part 1
  • water
  • flows
  • layer
  • CO2

Cite this

Assessment of performance of turbulence models in predicting supercritical pressure heat transfer in a vertical tube. / He, S.; Kim, W. S.; Bae, J. H.

In: International Journal of Heat and Mass Transfer, Vol. 51, No. 19-20, 09.2008, p. 4659-4675.

Research output: Contribution to journalArticle

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