Friction in the preseparation zone and heat transfer in the separation zone of a turbulent boundary layer in the flow of heated air in a diffuser with cooled walls

1968 ◽  
Vol 14 (5) ◽  
pp. 417-419
Author(s):  
P. N. Romanenko ◽  
A. N. Oblivin ◽  
L. G. Shelegova
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Separation Zone ◽  
Heated Air

Perforated Rib in Turbulent Boundary Layer

2019 ◽  
Vol 142 (2) ◽  
Author(s):  
Valery N. Afanasiev ◽  
Dehai Kong ◽  
S. A. Isaev
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Experimental Study ◽  
Turbulent Boundary Layer ◽  
Separation Zone ◽  
Area Ratio ◽  
Open Area ◽  
Staggered Arrangement ◽  
Recirculation Zones ◽  
The Mean

Abstract This study presents the results of the experimental study on hydrodynamics and heat transfer in separation zone in front and behind a single rectangular perforated rib mounted on a flat plate. The effects of perforation open-area ratio (β = 12%, 23.5%, and 44%) and the location of the hole on the rib (at the bottom, at the top, and in a staggered arrangement) on the mean and fluctuating characteristics of the turbulent dynamic and thermal boundary layers in the median section of the plate were examined. It was established that the stagnant and recirculation zones in the front and behind the perforated rib were shifted and became smaller or disappeared.

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