Numerical prediction of augmented turbulent heat transfer in an annular fuel channel with repeated two-dimensional square ribs

1996 ◽  
Vol 165 (1-2) ◽  
pp. 225-237 ◽  
Author(s):  
Kazuyuki Takase
Keyword(s):  
Heat Transfer ◽  
Numerical Prediction ◽  
Turbulent Heat Transfer ◽  
Turbulent Heat ◽  
Two Dimensional ◽  
Fuel Channel

scholarly journals Numerical prediction of turbulent heat transfer at low Prandtl number

2012 ◽  
Vol 395 ◽  
pp. 012044 ◽  
Author(s):  
L Bricteux ◽  
M Duponcheel ◽  
M Manconi ◽  
Y Bartosiewicz
Keyword(s):  
Heat Transfer ◽  
Prandtl Number ◽  
Numerical Prediction ◽  
Turbulent Heat Transfer ◽  
Turbulent Heat

Turbulent Heat Transfer Augmentation Using Microscale Disturbances Inside the Viscous Sublayer

1992 ◽  
Vol 114 (2) ◽  
pp. 348-353 ◽  
Author(s):  
H. Kozlu ◽  
B. B. Mikic ◽  
A. T. Patera
Keyword(s):  
Heat Transfer ◽  
Rectangular Channel ◽  
Heat Removal ◽  
Channel Flows ◽  
Turbulent Heat Transfer ◽  
Turbulent Heat ◽  
Two Dimensional ◽  
Optimal Position ◽  
Heat Transfer Augmentation ◽  
Near Wall

We report here on an experimental study of heat transfer augmentation in turbulent flow. Enhancement strategies employed in this investigation are based on the near-wall mixing processes induced in the sublayer through appropriate wall and near-wall streamwise-periodic disturbances. Experiments are performed in a low-turbulence wind-tunnel with a high-aspect-ratio rectangular channel having either (a) two-dimensional periodic microgrooves on the wall, or (b) two-dimensional microcylinders placed in the immediate vicinity of the wall. It is found that micro-disturbances placed inside the sublayer induce favorable heat-transport augmentation with respect to the smooth-wall case, in that near-analogous momentum and heat transfer behavior are preserved; a roughly commensurate increase in heat and momentum transport is termed favorable in that it leads to a reduction in the pumping power penalty at fixed heat removal rate. The study shows that this favorable performance of microcylinder-equipped channel flows is achieved for microcylinders placed inside y+ ≃20, implying a dependence of the optimal position and size on Reynolds number. For microgrooved channel flows, favorable augmentation is obtained for a wider range of Reynolds numbers; however, optimal enhancement still requires a matching of geometric perturbation with the sublayer scale.

Sign in / Sign up

Export Citation Format

Share Document