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Research Papers: Flows in Complex Systems

Effect of a Triangular Rib on a Flat Plate Boundary Layer

[+] Author and Article Information
F. Fouladi

Turbulence and Energy Laboratory,
Centre for Engineering Innovation,
University of Windsor,
401 Sunset Avenue,
Windsor, ON N9B 3P4, Canada
e-mail: fouladi@uwindsor.ca

P. Henshaw

Turbulence and Energy Laboratory,
Centre for Engineering Innovation,
University of Windsor,
401 Sunset Avenue,
Windsor, ON N9B 3P4, Canada
e-mail: henshaw@uwindsor.ca

D. S.-K. Ting

Mem. ASME
Turbulence and Energy Laboratory,
Centre for Engineering Innovation,
University of Windsor,
401 Sunset Avenue,
Windsor, ON N9B 3P4, Canada
e-mail: dting@uwindsor.ca

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received February 26, 2015; final manuscript received July 23, 2015; published online August 21, 2015. Assoc. Editor: D. Keith Walters.

J. Fluids Eng 138(1), 011101 (Aug 21, 2015) (11 pages) Paper No: FE-15-1129; doi: 10.1115/1.4031161 History: Received February 26, 2015; Revised July 23, 2015

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.

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Figures

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Fig. 1

Rib mounted flat plate schematic

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Fig. 2

Test section side view

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Fig. 3

Velocity profiles for smooth and ribbed wall at (a) U = 4 m/s, (b) U = 6.8 m/s, and (c) U = 9 m/s

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Fig. 4

Flow over a (a) square-ribbed surface [14] and (b) wedge-ribbed surface [3]

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Fig. 5

Liu et al. [14] velocity profile over a square-ribbed surface

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Fig. 6

Normalized velocity profiles inside the boundary layer at U = 9 m/s for the (a) smooth and (b) ribbed wall

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Fig. 7

Turbulent boundary layer normalized velocity profile of DeGraaff and Eaton [32]

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Fig. 8

Wake parameter at U = 9 m/s

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Fig. 9

Turbulence intensity profiles for smooth and ribbed wall at (a) U = 4 m/s, (b) U = 6.8 m/s, and (c) U = 9 m/s

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Fig. 10

Wall-normal location of maximum streamwise Tu: (a) present study at U = 9 m/s and (b) Liu et al. [14]

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Fig. 11

FFT of velocity fluctuation signal at Y/H = 1

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Fig. 12

Autocorrelation coefficient for ribbed wall at X/H = 20, Y/H = 2.2, and U = 9 m/s, the dashed line shows the parabola fitted curve to the first five points of R(τ)

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Fig. 13

Ribbed wall integral length scale at U = 9 m/s

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Fig. 14

Ribbed wall integral length scale at (a) U = 4 m/s, (b) U = 6.8 m/s, and (c) U = 9 m/s

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Fig. 15

Taylor microscale in the boundary layer at U = 9 m/s

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