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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.
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
oscillatory flow
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
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Document type: Journal Article
Collection: School of Engineering
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