Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/101980
Title: Wave number selection in the presence of noise: Experimental results
Authors: Zhilenko, D.
Krivonosova, O.
Gritsevich, M.
Read, P.
Issue Date: 2018
Publisher: American Institute of Physics Inc.
Citation: Wave number selection in the presence of noise: Experimental results / D. Zhilenko, O. Krivonosova, M. Gritsevich, et al. — DOI 10.1063/1.5011349 // Chaos. — 2018. — Vol. 28. — Iss. 5. — 053110.
Abstract: In this study, we consider how the wave number selection in spherical Couette flow, in the transition to azimuthal waves after the first instability, occurs in the presence of noise. The outer sphere was held stationary, while the inner sphere rotational speed was increased linearly from a subcritical flow to a supercritical one. In a supercritical flow, one of two possible flow states, each with different azimuthal wave numbers, can appear depending upon the initial and final Reynolds numbers and the acceleration value. Noise perturbations were added by introducing small disturbances into the rotational speed signal. With an increasing noise amplitude, a change in the dominant wave number from m to m ± 1 was found to occur at the same initial and final Reynolds numbers and acceleration values. The flow velocity measurements were conducted by using laser Doppler anemometry. Using these results, the role of noise as well as the behaviour of the amplitudes of the competing modes in their stages of damping and growth were determined. © 2018 Author(s).
Keywords: ACCELERATION
ARTICLE
FLOW RATE
LASER DOPPLER FLOWMETRY
NOISE
URI: http://hdl.handle.net/10995/101980
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85047472002
PURE ID: 7278301
f763eff0-c129-4453-9e30-beae5b6b334d
ISSN: 10541500
DOI: 10.1063/1.5011349
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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