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Coupling of U-Tube and shear layer oscillations in an interconnected flow compartment

Chua, Lloyd H. and Shuy, E.B. 2006, Coupling of U-Tube and shear layer oscillations in an interconnected flow compartment, Journal of engineering mechanics, vol. 132, no. 7, pp. 764-770, doi: 10.1061/(ASCE)0733-9399(2006)132:7(764).

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Title Coupling of U-Tube and shear layer oscillations in an interconnected flow compartment
Author(s) Chua, Lloyd H.ORCID iD for Chua, Lloyd H. orcid.org/0000-0003-2523-3735
Shuy, E.B.
Journal name Journal of engineering mechanics
Volume number 132
Issue number 7
Start page 764
End page 770
Total pages 7
Publisher American Society of Civil Engineers
Place of publication Reston, Va.
Publication date 2006
ISSN 1943-7889
Keyword(s) vortex shedding
feedback
oscillatory flow
resonance
jets
coupling
Summary Results of experiments conducted in a 2m 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, Lc=0.8m , 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 Lc=1.2 and 2.0m with oscillation frequencies governed by fluid-dynamic feedback, verified from a comparison with the results from a previously reported study.
Language eng
DOI 10.1061/(ASCE)0733-9399(2006)132:7(764)
Field of Research 099999 Engineering not elsewhere classified
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2006, American Society of Civil Engineers
Persistent URL http://hdl.handle.net/10536/DRO/DU:30063761

Document type: Journal Article
Collection: School of Engineering
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