IJSER Home >> Journal >> IJSER
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  
O.M. Oyewola
— Boundary layer, Length scale, Measurement, Near-wall, Structure, Suction, Turbu
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. 
[1] M. Gad-el-Hak, “Flow Control: Fundamental and Practices," Lecture Note in Physics, M. Gad-el-Hak, A. Pollard and J.P. Bonnet, eds., Springer, pp. 1-154, 1998.

[2] B.R. Pearson, R. Elavasaran and R.A. Antonia, "Effect of a Short Roughness Strip on a Turbulent Boundary Layer," Applied Science Research, vol. 59, pp. 61-75, 1998.

[3] A.S. Sutardi and C.Y. Ching, “Effect of Different Sized Transverse Square Grooves on a Turbulent Boundary Layer,” Experiment In Fluids, vol. 34, pp. 261-274, 2003.

[4] O. Oyewola, L. Djenidi and R.A. Antonia, "Combined Influence of the Reynolds Number and Localised Wall Suction on a Turbulent Boundary Layer," Experiment In Fluids, vol. 35, pp. 199-206, 2003.

[5] O. Oyewola, L. Djenidi, and R.A. Antonia, “Influence of Localised Wall Suction on the Anisotropy of the Reynolds Stress Tensor in a Turbulent Boundary Layer,” Experiment In Fluids,vol. 37,pp. 187-193, 2004.

[6] L. Djenidi, P.E. Gall, A. Vincent, and R.A. Antonia, “Effect of Wall Suction on the Structure of a Turbulent Boundary Layer,” Proc.of the 11th International Symp. on Application of Laser Techniques to Fluid Mechanics, Lisbon, 2002,

Untitled Page