Coupling of U-Tube and Shear Layer Oscillations in an Interconnected Flow Compartment
Publication: Journal of Engineering Mechanics
Volume 132, Issue 7
Abstract
Results of experiments conducted in a high flume at large Reynolds numbers are reported in this paper. The flume was partitioned into two compartments. Flow entered the bottom of the upstream test compartment as a wall jet, at jet Reynolds number ranging from 11,000 to 170,000. Periodic oscillations of the free surface in the two compartments resembling the oscillatory flow in a liquid-filled U-tube, and large coherent structures formed above the potential core of the wall jet were observed. Coupling of the U-tube oscillations and vortex shedding is attributed to fluid-dynamic and fluid-resonant feedback processes. For test compartment length, , fluid-resonant feedback was found to be dominant, and the shear layer was observed to oscillate at the natural frequency of the two-compartment, U-tube system. The observed U-tube oscillations are initiated by the oscillations of the shear layer at a frequency equal to the subharmonic component for the U-tube. The flow oscillations were generally weaker for and with oscillation frequencies governed by fluid-dynamic feedback, verified from a comparison with the results from a previously reported study.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 132 • Issue 7 • July 2006
Pages: 764 - 770
Copyright
© 2006 ASCE.
History
Received: May 13, 2004
Accepted: Oct 20, 2005
Published online: Jul 1, 2006
Published in print: Jul 2006
Notes
Note. Associate Editor: Nikolaos D. Katopodes
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