Numerical Analysis of Deterioration in Heat Transfer to Supercritical Water

Seiichi Koshizuka, Naoki Takano, Yoshiaki Oka

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Deterioration in heat transfer to supercritical water is numerically studied using a k-ε model. Physical properties are treated as variables and calculatd from the steam table library. The numerical result agrees with the experimental data of Yamagata et al. [Trans. JSME, 38–2 (1972)] It is found that heat-transfer deterioration is caused by two mechanisms depending on the flow rate. In the case of large flow rate, heat transfer is reduced near the wall where the fluid properties are locally changed due to the heat flux. In the case of small flow rate, buoyancy force flattens the flow velocity distribution and the turbulent heat transfer is decreased. The present analysis shows that supercritical thermal hydraulics can be explained by the single-phase turbulent fluid dynamics.

Original languageEnglish
Pages (from-to)2497-2503
Number of pages7
JournalTransactions of the Japan Society of Mechanical Engineers Series B
Volume60
Issue number575
DOIs
Publication statusPublished - 1994 Jan 1
Externally publishedYes

Keywords

  • Heat-Transfer Deterioration
  • Numerical Analysis
  • Pipe Flow
  • Supercritical Water
  • Turbulent Flow

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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