Turbulent Forced Convection in Ducts

Masoud Rokni

Research output: Chapter in Book/Report/Conference proceedingBook chapterResearchpeer-review

Abstract

The need for a reliable and reasonably accurate turbulence model without specific convergence problems for calculating duct flows in industrial applications has become more evident. In this chapter a general computational method is presented for calculating turbulent quantities in any arbitrary three-dimensional duct. Four different turbulence models for predicting the turbulent Reynolds stresses, namely the standard k- model, the non-linear k- model of Speziale, an Explicit Algebraic Stress Model (EASM) and a full Reynolds Stress Model (RSM) are compared with each other. The turbulent heat fluxes are modeled by the SED concept, the GGDH and the WET methods. The two-equation model of temperature invariance and its dissipation rate for calculating turbulent heat fluxes is also discussed. The numerical method is based on the finite volume technique with non-staggered grid arrangement. The SIMPLEC algorithm is used for pressure~ velocity coupling. A modified SIP solving method is implemented for solving the equations. The van Leer, QUICK and hybrid schemes are applied for treating the convective terms. Periodic boundary conditions are imposed in the main flow direction for decreasing the number of grid points in this direction. In practical applications, periodic conditions in the main flow direction are commonly justified because in wavy or corrugated ducts such conditions occur naturally.
Keyword: Turbulent, Heat Transfer, Convection, Turbulence Modelling
Original languageEnglish
Title of host publicationConvection Heat Transfer
EditorsBengt Sundén, Gianni Comini
Place of PublicationIBT Global, London
PublisherWIT Press
Publication date2000
Pages361-407
ISBN (Print)1-85312-734-5
Publication statusPublished - 2000
Externally publishedYes

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