Turbulent heat transfer of supercritical carbon dioxide in square cross-sectional duct flow

Seong Ho Han, Young Don Choi, Jong Keun Shin, Young Chan Kim, Min Soo Kim

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Numerical simulations are performed to develop a new heat transfer coefficient correlation applicable to the gas cooler design of a trans-critical carbon dioxide air-conditioner. Thermodynamic and transport properties of the supercritical gas cooling process change dramatically and significantly vary heat transfer coefficients to be much different from those of single or two phase flows. In the present study, the elliptic blending second moment turbulent closure precisely reflecting the effects of these thermo-physical property variations on the turbulent heat transfer is employed to model the Reynolds stresses and turbulent heat fluxes in the momentum and energy equations. Computational results related to the development of turbulent heat transfer during in-duct cooling of supercritical carbon dioxide were used to establish a new heat transfer coefficient correlation that would be widely applicable to a gas cooler design involving turbulent heat transfer of supercritical carbon dioxide in square cross-sectional duct flows.

Original languageEnglish
Pages (from-to)2563-2577
Number of pages15
JournalJournal of Mechanical Science and Technology
Volume22
Issue number12
DOIs
Publication statusPublished - 2008 Dec

Keywords

  • Buoyant generation
  • Carbon dioxide
  • Elliptic blending model
  • Heat transfer coefficient correlation
  • Reynolds stress model
  • Supercritical state
  • Thermal expansion coefficient

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering

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