A new turbulence model for predicting fluid flow and heat transfer in separating and reattaching flows-II. Thermal field calculations

K. Abe, T. Kondoh, Y. Nagano

Research output: Contribution to journalArticle

228 Citations (Scopus)

Abstract

A new turbulence model to calculate complex turbulent heat transfer in separating and reattaching flows is proposed. This new model is a modified version of the latest low-Reynolds-number two-equation heat-transfer model, in which the main improvement is achieved by introducing the Kolmogorov velocity scale, uε ≡ (νε) 1 4, instead of the friction velocity uτ, to account for the near-wall and low-Reynolds-number effects in both attached and detached flows. After investigating the characteristics of various time scales for the heat-transfer model, we adopted a composite time scale which gives weight to a shorter scale among the velocity- and temperature-field time scales. It is validated that the present model predicts quite accurately the turbulent heat transfer in separating and reattaching flows downstream of a backward-facing step, which involve most of the essential physics of complex turbulent heat transfer, under various conditions of flow Reynolds number and upstream boundary-layer thickness. In addition, the computational results have revealed several new mechanistic features of the turbulent heat transfer in separating and reattaching flows.

Original languageEnglish
Pages (from-to)1467-1481
Number of pages15
JournalInternational Journal of Heat and Mass Transfer
Volume38
Issue number8
DOIs
Publication statusPublished - May 1995
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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