Buoyancy-aided/opposed convection heat transfer for unsteady turbulent flow across a square cylinder in a vertical channel

Shiang Wuu Perng, Horng Wen Wu

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The Large Eddy Simulation (LES) and SIMPLE-C method coupled with preconditioned conjugate gradient methods have been employed to study the effect of aiding/opposing buoyancy on the turbulent flow field and heat transfer across a square cylinder in a vertical channel. The level of wall-confinement (blockage ratio of 10%, 30% and 50%) was changed with a constant Reynolds number (5000) under various Richardson numbers (-1 to 1). With increasing blockage ratio, the buoyancy effect is becoming weaker on the Nusselt number for the square cylinder. The turbulent heat transfer past the square cylinder can be improved by increasing the blockage ratio.

Original languageEnglish
Pages (from-to)3701-3717
Number of pages17
JournalInternational Journal of Heat and Mass Transfer
Volume50
Issue number19-20
DOIs
Publication statusPublished - 2007 Sep 1

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Heat convection
Engine cylinders
Buoyancy
buoyancy
turbulent flow
Turbulent flow
convection
heat transfer
turbulent heat transfer
Heat transfer
Richardson number
conjugate gradient method
Conjugate gradient method
Large eddy simulation
large eddy simulation
Nusselt number
Reynolds number
Flow fields
flow distribution

All Science Journal Classification (ASJC) codes

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

Cite this

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abstract = "The Large Eddy Simulation (LES) and SIMPLE-C method coupled with preconditioned conjugate gradient methods have been employed to study the effect of aiding/opposing buoyancy on the turbulent flow field and heat transfer across a square cylinder in a vertical channel. The level of wall-confinement (blockage ratio of 10{\%}, 30{\%} and 50{\%}) was changed with a constant Reynolds number (5000) under various Richardson numbers (-1 to 1). With increasing blockage ratio, the buoyancy effect is becoming weaker on the Nusselt number for the square cylinder. The turbulent heat transfer past the square cylinder can be improved by increasing the blockage ratio.",
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Buoyancy-aided/opposed convection heat transfer for unsteady turbulent flow across a square cylinder in a vertical channel. / Perng, Shiang Wuu; Wu, Horng Wen.

In: International Journal of Heat and Mass Transfer, Vol. 50, No. 19-20, 01.09.2007, p. 3701-3717.

Research output: Contribution to journalArticle

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