Time-resolved heat transfer characteristics for steady turbulent flow with step changing and periodically pulsating flow temperatures

2014 ◽  
Vol 76 ◽  
pp. 184-198 ◽  
Author(s):  
Cun-liang Liu ◽  
Jens von Wolfersdorf ◽  
Ying-ni Zhai
Keyword(s):  
Heat Transfer ◽  
Turbulent Flow ◽  
Pulsating Flow ◽  
Heat Transfer Characteristics ◽  
Time Resolved ◽  
Transfer Characteristics

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

2007 ◽  
Vol 11 (4) ◽  
pp. 171-178
Author(s):  
Khalid Alammar
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Prandtl Number ◽  
Turbulent Flow ◽  
Turbulence Model ◽  
Numerical Study ◽  
Sudden Expansion ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Simulated Effect

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.

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