Record Details

Near-field measurements and development of a new boundary layer over a flat plate with localized suction

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Near-field measurements and development of a new boundary layer over a flat plate with localized suction
 
Creator AGRAWAL, A
DJENIDI, L
ANTONIA, RA
 
Subject concentrated wall suction
low-speed streaks
reynolds-number
anisotropy
closure
 
Description Suction on a turbulent boundary layer is applied through a narrow strip in order to understand the effects suction can have on the boundary layer development and turbulent structures in the flow. Detailed two-component laser Doppler velocimetry (LDV) and laser-induced fluorescence (LIF) based measurements have been undertaken in regions close to the suction strip and further downstream. The region close to the strip involves a flow reversal accompanied by a change in sign for the Reynolds shear stress and strong gradients in the flow variables. The mean streamwise velocity after suction remains larger than its corresponding no-suction value. Relative to the no-suction case, the velocity fluctuations first decrease with suction followed by a slow recovery which may involve a slight overshoot. LIF visualizations indicate that compared to the no-suction case, the low-speeds streaks stay closer to the wall and exhibit a smaller amount of spanwise and wall-normal oscillations with suction. The visualization results are consistent with two-point velocity correlation measurements. The streamwise and spanwise correlation measurements indicate that the structures are disrupted or removed from the boundary layer due to suction suggesting that the original boundary layer has been strongly influenced by suction. The results are explained by the development of a new inner layer that forms downstream of the suction strip.
 
Publisher SPRINGER
 
Date 2011-08-29T15:54:22Z
2011-12-26T12:58:39Z
2011-12-27T05:49:00Z
2011-08-29T15:54:22Z
2011-12-26T12:58:39Z
2011-12-27T05:49:00Z
2010
 
Type Article
 
Identifier EXPERIMENTS IN FLUIDS, 48(5), 747-762
0723-4864
http://dx.doi.org/10.1007/s00348-009-0766-7
http://dspace.library.iitb.ac.in/xmlui/handle/10054/12126
http://hdl.handle.net/10054/12126
 
Language en