Numerical investigation of mixed convective heat transfer for unsteady turbulent flow over heated blocks in a horizontal channel

Shiang Wuu Perng, Horng-Wen Wu

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The turbulent flow field and heat transfer enhancement of mixed convection in a horizontal block-heated channel was investigated, using the Large Eddy Simulation (LES) and SIMPLE-C method coupled with preconditioned conjugate gradient methods. A rectangular turbulator was mounted in the channel to enhance heat transfer by means of an internal flow modification induced by vortex shedding in this study. The width-to-height ratio of turbulator was changed (0.25, 0.5 and 1.0) with a constant Reynolds number (5000) under various Grashof numbers (0 - 5.0 E + 8) for the purpose of investigating the heat transfer performance. The results indicate that the turbulator mounted in cross-flow above an upstream block can effectively enhance the heat transfer performance of mixed convection in the horizontal channel.

Original languageEnglish
Pages (from-to)620-632
Number of pages13
JournalInternational Journal of Thermal Sciences
Volume47
Issue number5
DOIs
Publication statusPublished - 2008 May 1

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convective heat transfer
turbulent flow
Turbulent flow
heat transfer
Heat transfer
Mixed convection
convection
Grashof number
internal flow
conjugate gradient method
Conjugate gradient method
cross flow
vortex shedding
Vortex shedding
Large eddy simulation
large eddy simulation
upstream
Reynolds number
Flow fields
flow distribution

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Engineering(all)

Cite this

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abstract = "The turbulent flow field and heat transfer enhancement of mixed convection in a horizontal block-heated channel was investigated, using the Large Eddy Simulation (LES) and SIMPLE-C method coupled with preconditioned conjugate gradient methods. A rectangular turbulator was mounted in the channel to enhance heat transfer by means of an internal flow modification induced by vortex shedding in this study. The width-to-height ratio of turbulator was changed (0.25, 0.5 and 1.0) with a constant Reynolds number (5000) under various Grashof numbers (0 - 5.0 E + 8) for the purpose of investigating the heat transfer performance. The results indicate that the turbulator mounted in cross-flow above an upstream block can effectively enhance the heat transfer performance of mixed convection in the horizontal channel.",
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AB - The turbulent flow field and heat transfer enhancement of mixed convection in a horizontal block-heated channel was investigated, using the Large Eddy Simulation (LES) and SIMPLE-C method coupled with preconditioned conjugate gradient methods. A rectangular turbulator was mounted in the channel to enhance heat transfer by means of an internal flow modification induced by vortex shedding in this study. The width-to-height ratio of turbulator was changed (0.25, 0.5 and 1.0) with a constant Reynolds number (5000) under various Grashof numbers (0 - 5.0 E + 8) for the purpose of investigating the heat transfer performance. The results indicate that the turbulator mounted in cross-flow above an upstream block can effectively enhance the heat transfer performance of mixed convection in the horizontal channel.

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