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International Journal of Scientific and Engineering Research
ISSN Online 2229-5518
ISSN Print: 2229-5518 2    
Website: http://www.ijser.org
scirp IJSER >> Volume 3,Issue 2,February 2012
Manipulation of Near-wall Structure in a Boundary Layer Subjected to Concentrated Suction and Roughness Strip
Full Text(PDF, )  PP.149-152  
Author(s)
O.M. Oyewola
KEYWORDS
— Boundary layer, Length scale, Measurement, Near-wall, Structure, Suction, Turbu
ABSTRACT
Hot-wire measurements have been made in a turbulent boundary layer subjected to a short roughness strip and concentrated suction with the view to examine their combined effect on the near-wall boundary layer structure. The suction is applied through a porous wall strip for a range of suction rate. The results indicate that, the combination of suction and roughness strip alters the pseudo-equilibrium of the boundary layer through the modification of the length scale of the turbulence structure in a phenomenological manner, suggesting that there is a possibility of them acting independently on the different mechanism of the boundary layer. While the application of suction weakened the structure, it is reactivated in the presence of the roughness element. 
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