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Surface switching statistics of rotating fluid: Disk-rim gap effects

Yuji Tasaka*

Makoto Iima

  • Laboratory for Flow Control, Hokkaido University, N13W8, Sapporo 060-8628, Japan

  • Graduate School of Science, Hiroshima University, 1-7-1 Kagamiyama, Higashi-hiroshima 739-8521, Japan

  • *tasaka@eng.hokudai.ac.jp
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Phys. Rev. E 95, 043113 – Published 27 April, 2017

DOI: https://doi.org/10.1103/PhysRevE.95.043113

Abstract

We examined the influence of internal noise on the irregular switching of the shape of the free surface of fluids in an open cylindrical vessel driven by a bottom disk rotating at constant speed [Suzuki, Iima, and Hayase, Phys. Fluids 18, 101701 (2006)]. A slight increase in the disk-rim gap (less than 3% of the disk radius) was established experimentally to cause significant changes in this system, specifically, frequent appearance of the surface descending event connecting a nonaxisymmetric shape in strong mixing flow (turbulent flow) and an axisymmetric shape in laminar flow, as well as a shift in critical Reynolds number that define the characteristic states. The physical mechanism underlying the change is analyzed in terms of flow characteristics in the disk-rim gap, which acts as a noise source, and a mathematical model established from measurements of the surface height fluctuations with noise term.

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Phys. Rev. E 95, 043113– Published 27 April, 2017
  • Received 16 November 2016
Article part of CHORUS

©2017 American Physical Society

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