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Flow regimes in a plane Couette flow with system rotation

Published online by Cambridge University Press:  07 April 2010

T. TSUKAHARA ,
N. TILLMARK  and
P. H. ALFREDSSON
T. TSUKAHARA*
Affiliation:
Linné Flow Centre, KTH Mechanics, Royal Institute of Technology, S-100 44, Stockholm, Sweden
N. TILLMARK
Affiliation:
Linné Flow Centre, KTH Mechanics, Royal Institute of Technology, S-100 44, Stockholm, Sweden
P. H. ALFREDSSON
Affiliation:
Linné Flow Centre, KTH Mechanics, Royal Institute of Technology, S-100 44, Stockholm, Sweden
*
†Present address: Department of Mechanical Engineering, Faculty of Science and Technology, Tokyo University of Science, Yamazaki 2641, Noda-shi, Chiba, 278-8510, Japan. Email address for correspondence: tsuka@rs.noda.tus.ac.jp
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Abstract

Flow states in plane Couette flow in a spanwise rotating frame of reference have been mapped experimentally in the parameter space spanned by the Reynolds number and rotation rate. Depending on the direction of rotation, the flow is either stabilized or destabilized. The experiments were made through flow visualization in a Couette flow apparatus mounted on a rotating table, where reflected flakes are mixed with the water to visualize the flow. Both short- and long-time exposures have been used: the short-time exposure gives an instantaneous picture of the turbulent flow field, whereas the long-time exposure averages the small, rapidly varying scales and gives a clearer representation of the large scales. A correlation technique involving the light intensity of the photographs made it possible to obtain, in an objective manner, both the spanwise and streamwise wavelengths of the flow structures. During these experiments 17 different flow regimes have been identified, both laminar and turbulent with and without roll cells, as well as states that can be described as transitional, i.e. states that contain both laminar and turbulent regions at the same time. Many of these flow states seem to be similar to those observed in Taylor–Couette flow.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 648 , 10 April 2010 , pp. 5 - 33
Copyright
Copyright © Cambridge University Press 2010

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