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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July 2016
Research-Article
Experimental Investigation on Flows in a Corrugated Channel
Efe Ünal,
Efe Ünal
Faculty of Engineering,
Yeditepe University,
Ataşehir, Istanbul 34755, Turkey
e-mail: efeunal87@gmail.com
Yeditepe University,
Ataşehir, Istanbul 34755, Turkey
e-mail: efeunal87@gmail.com
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Hojin Ahn,
Hojin Ahn
Mem. ASME
Faculty of Engineering,
Yeditepe University,
Ataşehir, Istanbul 34755, Turkey
e-mail: erdeman@yeditepe.edu.tr
Faculty of Engineering,
Yeditepe University,
Ataşehir, Istanbul 34755, Turkey
e-mail: erdeman@yeditepe.edu.tr
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Esra Sorguven
Esra Sorguven
Faculty of Engineering,
Yeditepe University,
Ataşehir, Istanbul 34755, Turkey
e-mail: sorguven@yeditepe.edu.tr
Yeditepe University,
Ataşehir, Istanbul 34755, Turkey
e-mail: sorguven@yeditepe.edu.tr
Search for other works by this author on:
Efe Ünal
Faculty of Engineering,
Yeditepe University,
Ataşehir, Istanbul 34755, Turkey
e-mail: efeunal87@gmail.com
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
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
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. Jul 2016, 138(7): 070908 (8 pages)
Published Online: April 22, 2016
Article history
Received:
July 7, 2015
Revised:
December 28, 2015
Citation
Ünal, E., Ahn, H., and Sorguven, E. (April 22, 2016). "Experimental Investigation on Flows in a Corrugated Channel." ASME. J. Fluids Eng. July 2016; 138(7): 070908. https://doi.org/10.1115/1.4032754
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