scholarly journals Turbulent Drag Reduction in a d-Type Rough Wall Boundary Layer with Longitudinal Thin Ribs Placed within the Transverse Grooves. Higher-Order Moments and Conditional Sampling Analysis.

1994 ◽  
Vol 60 (578) ◽  
pp. 3264-3271
Author(s):  
Shinsuke Mochizuki ◽  
Akimine Izawa ◽  
Hideo Osaka
Keyword(s):  
Boundary Layer ◽  
Drag Reduction ◽  
Higher Order ◽  
Rough Wall ◽  
Conditional Sampling ◽  
Turbulent Drag Reduction ◽  
Higher Order Moments ◽  
Wall Boundary Layer ◽  
Turbulent Drag ◽  
Transverse Grooves

Bubbly Turbulent Drag Reduction Is a Boundary Layer Effect

2007 ◽  
Vol 98 (8) ◽  
Author(s):  
Thomas H. van den Berg ◽  
Dennis P. M. van Gils ◽  
Daniel P. Lathrop ◽  
Detlef Lohse
Keyword(s):  
Boundary Layer ◽  
Drag Reduction ◽  
Turbulent Drag Reduction ◽  
Boundary Layer Effect ◽  
Turbulent Drag ◽  
Layer Effect

scholarly journals Superhydrophobic turbulent drag reduction as a function of surface grating parameters

2014 ◽  
Vol 747 ◽  
pp. 722-734 ◽  
Author(s):  
Hyungmin Park ◽  
Guangyi Sun ◽  
Chang-Jin “CJ” Kim
Keyword(s):  
Boundary Layer ◽  
Drag Reduction ◽  
Turbulent Flows ◽  
Smooth Surface ◽  
Continuous Monitoring ◽  
Laminar Flows ◽  
Turbulent Drag Reduction ◽  
Surface Grating ◽  
Turbulent Drag ◽  
Slip Flows

AbstractDespite the confirmation of slip flows and successful drag reduction (DR) in small-scaled laminar flows, the full impact of superhydrophobic (SHPo) DR remained questionable because of the sporadic and inconsistent experimental results in turbulent flows. Here we report a systematic set of bias-free reduction data obtained by measuring the skin-friction drags on a SHPo surface and a smooth surface at the same time and location in a turbulent boundary layer (TBL) flow. Each monolithic sample consists of a SHPo surface and a smooth surface suspended by flexure springs, all carved out from a $2.7 \times 2.7 {\mathrm{mm}}^{2}$ silicon chip by photolithographic microfabrication. The flow tests allow continuous monitoring of the plastron on the SHPo surfaces, so that the DR data are genuine and consistent. A family of SHPo samples with precise profiles reveals the effects of grating parameters on turbulent DR, which was measured to be as much as ${\sim }75\, \%$.

Turbulent drag reduction in a closed flow system: Boundary layer versus bulk effects

1998 ◽  
Vol 10 (2) ◽  
pp. 426-436 ◽  
Author(s):  
Olivier Cadot ◽  
Daniel Bonn ◽  
Stéphane Douady
Keyword(s):  
Boundary Layer ◽  
Drag Reduction ◽  
Flow System ◽  
Layer Versus ◽  
System Boundary ◽  
Turbulent Drag Reduction ◽  
Turbulent Drag
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