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

Ken-Ichi Abe, T. Kondoh, Y. Nagano

Research output: Contribution to journalArticle

219 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 - Jan 1 1995
Externally publishedYes

Fingerprint

turbulent heat transfer
turbulence models
Turbulence models
fluid flow
Flow of fluids
heat transfer
Heat transfer
low Reynolds number
Reynolds number
backward facing steps
boundary layer thickness
upstream
temperature distribution
friction
velocity distribution
Hot Temperature
Boundary layers
Temperature distribution
Physics
physics

All Science Journal Classification (ASJC) codes

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

Cite this

@article{b683eb8486d142b293957e9942a6cd28,
title = "A new turbulence model for predicting fluid flow and heat transfer in separating and reattaching flows-II. Thermal field calculations",
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.",
author = "Ken-Ichi Abe and T. Kondoh and Y. Nagano",
year = "1995",
month = "1",
day = "1",
doi = "10.1016/0017-9310(94)00252-Q",
language = "English",
volume = "38",
pages = "1467--1481",
journal = "International Journal of Heat and Mass Transfer",
issn = "0017-9310",
publisher = "Elsevier Limited",
number = "8",

}

TY - JOUR

T1 - A new turbulence model for predicting fluid flow and heat transfer in separating and reattaching flows-II. Thermal field calculations

AU - Abe, Ken-Ichi

AU - Kondoh, T.

AU - Nagano, Y.

PY - 1995/1/1

Y1 - 1995/1/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=0029124386&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0029124386&partnerID=8YFLogxK

U2 - 10.1016/0017-9310(94)00252-Q

DO - 10.1016/0017-9310(94)00252-Q

M3 - Article

AN - SCOPUS:0029124386

VL - 38

SP - 1467

EP - 1481

JO - International Journal of Heat and Mass Transfer

JF - International Journal of Heat and Mass Transfer

SN - 0017-9310

IS - 8

ER -