INCREASE OF HEAT TRANSFER AND NEGATIVE EDDY VISCOSITY IN TURBULENT FLOWS INFLUENCED BY A MAGNETIC FIELD

1990 ◽  
Author(s):  
C. Henoch ◽  
Martin Hoffert ◽  
A. Baron ◽  
D. Klaiman ◽  
Semion Sukoriansky ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Turbulent Flows ◽  
Eddy Viscosity

Numerical investigations of heat transfer mechanisms in the forced laminar wall jet

2001 ◽  
Vol 442 ◽  
pp. 191-215 ◽  
Author(s):  
JÜRGEN SEIDEL ◽  
HERMANN F. FASEL
Keyword(s):  
Heat Transfer ◽  
Turbulent Flows ◽  
Eddy Viscosity ◽  
High Amplitude ◽  
Detailed Examination ◽  
Laminar Flows ◽  
Wall Jet ◽  
Wall Heat Transfer ◽  
Transport Mechanisms ◽  
Transfer Mechanisms

The effect of high-amplitude forcing on a laminar wall jet over a heated flat plate is analysed. Highly accurate direct numerical simulations (DNS) are used to investigate the dominant transport mechanisms. When forcing is applied, the skin friction is reduced markedly and the wall heat transfer is increased. Detailed examination of the unsteady flow field showed that the concepts of eddy viscosity and eddy thermal diffusivity, usually applied to turbulent flows, can be applied to the analysis of unsteady laminar flows to explain the effect of highly unsteady phenomena.

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