Effect of a Triangular Rib on a Flat Plate Boundary Layer

2015 ◽  
Vol 138 (1) ◽  
Author(s):  
F. Fouladi ◽  
P. Henshaw ◽  
D. S.-K. Ting
Keyword(s):  
Boundary Layer ◽  
Wind Tunnel ◽  
Flat Plate ◽  
Turbulence Intensity ◽  
Plate Boundary ◽  
Leading Edge ◽  
Smooth Wall ◽  
Turbulence Length ◽  
Turbulence Parameters ◽  
Flat Plate Boundary Layer

The flow structure downstream of a triangular rib over a thin plate placed in a wind tunnel was experimentally investigated using a boundary layer hotwire anemometer. Flow and boundary layer characteristics, such as thickness, shape, and turbulence parameters, were studied at different freestream velocities and streamwise locations corresponding to ReX of 1.7 × 104–2.8 × 105 for plates without and with a leading edge rib. It was found that the boundary layer of the flow over a ribbed wall was 3–3.5 times thicker and had higher turbulence intensity and smaller turbulence length scales compared to its smooth wall counterpart.

scholarly journals Streamwise counter-rotating vortices generated by triangular leading edge pattern in flat plate boundary layer

2016 ◽  
Vol 19 (3) ◽  
pp. 359-367 ◽  
Author(s):  
S. M. Hasheminejad ◽  
H. Mitsudharmadi ◽  
S. H. Winoto ◽  
K. B. Lua ◽  
H. T. Low
Keyword(s):  
Boundary Layer ◽  
Flat Plate ◽  
Plate Boundary ◽  
Leading Edge ◽  
Flat Plate Boundary Layer ◽  
Edge Pattern

Distortion of a flat-plate boundary layer by free-stream vorticity normal to the plate

1992 ◽  
Vol 237 ◽  
pp. 231-260 ◽  
Author(s):  
M. E. Goldstein ◽  
S. J. Leib ◽  
S. J. Cowley
Keyword(s):  
Boundary Layer ◽  
Flat Plate ◽  
Free Stream ◽  
Plate Boundary ◽  
Leading Edge ◽  
Uniform Flow ◽  
Viscous Boundary Layer ◽  
Layer Flow ◽  
Viscous Boundary ◽  
Flat Plate Boundary Layer

We consider a nominally uniform flow over a semi-infinite flat plate. Our analysis shows how a small streamwise disturbance in the otherwise uniform flow ahead of the plate is amplified by leading-edge bluntness effects and eventually leads to a small-amplitude but nonlinear spanwise motion far downstream from the leading edge of the plate. This spanwise motion is then imposed on the viscous boundary-layer flow at the surface of the plate – causing an order-one change in its profile shape. This ultimately reduces the wall shear stress to zero – causing the boundary layer to undergo a localized separation, which may be characterized as a kind of bursting phenomenon that could be related to the turbulent bursts observed in some flat-plate boundary-layer experiments.

Leading edge shape for flat plate boundary layer studies

1994 ◽  
Vol 17 (5) ◽  
pp. 358-360 ◽  
Author(s):  
R. Narasimha ◽  
S. N. Prasad
Keyword(s):  
Boundary Layer ◽  
Flat Plate ◽  
Plate Boundary ◽  
Leading Edge ◽  
Flat Plate Boundary Layer
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