Atthanayake, Iresha, Denissenko, Petr, Chung, Yongmann M. and Thomas, Peter J. (2019) Formation-breakdown cycle of turbulent jets in a rotating fluid. Journal of Fluid Mechanics, 868 . pp. 666-697. doi:10.1017/jfm.2019.186

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Abstract

Results of comprehensive particle image velocimetry measurements investigating the dynamics of turbulent jets in a rotating fluid are presented. It is observed that background system rotation induces a time-periodic formation–breakdown cycle of the jets. The flow dynamics associated with this process is studied in detail. It is found that the frequency of the cycle increases linearly with the background rotation rate. The data show that the onset of the breakdown phase and of the reformation phase of the cycle can be characterized in terms of a local Rossby number employing an internal velocity and a length scale of the jet. The critical values for this local Rossby number, for onset of breakdown and reformation, scale linearly with a global Rossby number based on the flow conditions at the source. The analysis of the experimental data suggests centrifugal instability as the potential origin of the formation–breakdown cycle.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Engineering
Library of Congress Subject Headings (LCSH):	Fluid dynamics, Rossby number
Journal or Publication Title:	Journal of Fluid Mechanics
Publisher:	Cambridge University Press
ISSN:	0022-1120
Official Date:	10 June 2019
Dates:	Date Event 10 June 2019 Published 17 April 2019 Available 25 February 2019 Accepted
Date of first compliant deposit:	7 March 2019
Volume:	868
Page Range:	pp. 666-697
DOI:	10.1017/jfm.2019.186
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID GR/N64519/01 [EPSRC] Engineering and Physical Sciences Research Council http://dx.doi.org/10.13039/501100000266
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