Effect of Prandtl number on heat transfer characteristics in an axisymmetric sudden expansion: A numerical study

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 se...

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Veröffentlicht in:Thermal science 2007, Vol.11 (4), p.171-178
1. Verfasser: Alammar, Khalid
Format: Artikel
Sprache:eng
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Zusammenfassung: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.
ISSN:0354-9836
2334-7163
DOI:10.2298/TSCI0704171A