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Research Papers: Fundamental Issues and Canonical Flows

Experimental Investigation on Flows in a Corrugated Channel

[+] Author and Article Information
Efe Ünal

Faculty of Engineering,
Yeditepe University,
Ataşehir, Istanbul 34755, Turkey
e-mail: efeunal87@gmail.com

Hojin Ahn

Mem. ASME
Faculty of Engineering,
Yeditepe University,
Ataşehir, Istanbul 34755, Turkey
e-mail: erdeman@yeditepe.edu.tr

Esra Sorguven

Faculty of Engineering,
Yeditepe University,
Ataşehir, Istanbul 34755, Turkey
e-mail: sorguven@yeditepe.edu.tr

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received July 7, 2015; final manuscript received December 28, 2015; published online April 22, 2016. Assoc. Editor: Daniel Maynes.

J. Fluids Eng 138(7), 070908 (Apr 22, 2016) (8 pages) Paper No: FE-15-1461; doi: 10.1115/1.4032754 History: Received July 07, 2015; Revised December 28, 2015

Flows in a corrugated channel are investigated by a high-speed camera and a particle image velocimetry (PIV) system. The bottom wall of the rectangular channel was corrugated with periodic grooves while the top wall and two sidewalls were flat plates made of Plexiglas. Flow visualization data from the high-speed camera determine the critical Reynolds number to be around 1500 by examining the stability of the vortex in the groove as well as fluid ejection from the groove. The visualization data for turbulent flow also show how a vortex evolves within the groove and triggers another vortex formation in the subsequent groove, and how fluid ejected from the groove triggers another ejection from the subsequent groove. Thus, strong hydrodynamic interactions are observed between successive corrugations. In addition, PIV data provide the profiles of velocities and Reynolds stresses as a function of Reynolds number. Time-averaged streamlines show that a large, stable vortex exists in the groove for laminar flow. On the other hand, for turbulent flow, the vortex is unstable inside the groove, often prompting fluid ejection which interacts with the bulk flow. Especially the Reynolds stress of the square of velocity fluctuation in the direction normal to the bulk flow significantly increases as the fluid ejection from the groove intensifies with increasing Reynolds number.

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Figures

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Fig. 3

Schematic of PIV system

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Fig. 2

Experimental setup

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Fig. 1

Schematic of the corrugated channel

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Fig. 4

Time-averaged streamlines at the mid plane (z/b = 0.5) for different Reynolds numbers: (a) Re = 1100, (b) Re = 2200, (c) Re = 5300, and (d) Re = 20,000

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Fig. 7

Time-averaged streamlines at the x–y plane for Re = 5300 at (a) z/b = 0.5 (the mid plane), (b) z/b = 0.65, (c)z/b = 0.75, and (d) z/b = 0.85

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Fig. 8

Profiles of Reynolds stresses, <u′v′>, <v′v′>, and <u′u′>, normalized by the mean velocity square at Re = 5300 for different z/b locations and x/λ = 0.5

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Fig. 9

Time-averaged normal velocity profiles at Re = 20,000 for different z/b locations and x/λ = 0.5

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Fig. 10

Time-averaged streamwise velocity profiles at Re = 20,000 for different z/b locations and x/λ = 0.5

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Fig. 5

The profile of the time-averaged streamwise velocity normalized by the mean velocity at the mid plane (z/b = 0.5) and at x/λ = 0 for different Reynolds numbers

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Fig. 6

Profiles of Reynolds stresses, <u′v′>, <v′v′>, and <u′u′>, normalized by the mean velocity square at the mid plane (z/b = 0.5) and at x/λ = 0.5 for different Reynolds numbers

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