A Study on Turbulent Flow and Heat Transfer Characteristics in Ducts of Relevance for Heat Exchangers

Masoud Rokni, Bengt Sundén

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The performance of an explicit algebraic stress model with a cubic equation for closure constants is assessed in predicting the turbulent flow dynamics of ducts relevant for heat exchangers. The use of a cubic equation allows elimination of any damping functions in the tensor representation for the Reynolds stresses and thereby improves prediction of turbulent stresses theoretically. The methodology used here allows for prediction of Cm in any spatial points and eliminates the use of damping functions in the turbulent viscosity. A flow parameter, which characterizes the flow type from plane strain and plane shear to elliptical flows, is used to prescribe the flow type in the ducts under consideration. In all cases, isothermal conditions are imposed on the duct walls, and the turbulent heat fluxes are modeled using a new bounded quadratic generalized gradient-diffusion type model. In addition, the calculated results are compared with existing experimental data and satisfactory results are obtained. A comparison of velocity and temperature contours is shown in order to study the effect of waviness on flow/heat dynamics.
Original languageEnglish
JournalInternational Journal of Transport Phenomena
Volume6
Issue number3
Pages (from-to)225-246
ISSN1028-6578
Publication statusPublished - 2004
Externally publishedYes

Fingerprint Dive into the research topics of 'A Study on Turbulent Flow and Heat Transfer Characteristics in Ducts of Relevance for Heat Exchangers'. Together they form a unique fingerprint.

Cite this