学術雑誌論文 Surface switching statistics of rotating fluid: Disk-rim gap effects

Tasaka, Yuji  ,  Iima, Makoto

95 ( 4 )  , p.43113 , 2017-04-27 , American Physical Society (APS)
ISSN:2470-0045
内容記述
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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http://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/66177/1/PhysRevE.95.043113.pdf

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