THERMAL SCIENCE

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Khalid N. Alammar

EFFECT OF PRANDTL NUMBER ON HEAT TRANSFER CHARACTERISTICS IN AN AXISYMMETRIC SUDDEN EXPANSION: A NUMERICAL STUDY

ABSTRACT
Using the standard k-e turbulence model, an incompressible, axisymmetric turbulent flow with a sudden expansion was simulated. Effect of Prandtl number on heat transfer characteristics downstream of the expansion was investigated. The simulation revealed circulation downstream of the expansion. A secondary circulation (corner eddy) was also predicted. Reattachment was predicted at approximately 10 step heights. Corresponding to Prandtl number of 7.0, a peak Nusselt number 13 times the fully-developed value was predicted. The ratio of peak to fully-developed Nusselt number was shown to decrease with decreasing Prandtl number. Location of maximum Nusselt number was insensitive to Prandtl number.
KEYWORDS
turbulence, Prandtl number, heat transfer, expansion
PAPER SUBMITTED: 2007-03-03
PAPER REVISED: 2007-10-16
PAPER ACCEPTED: 2007-11-10
DOI REFERENCE: https://doi.org/10.2298/TSCI0704171A
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2007, VOLUME 11, ISSUE Issue 4, PAGES [171 - 178]
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Effect of Prandtl number on heat transfer characteristics in an axisymmetric sudden expansion: A numerical study

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