Bulletin of the American Physical Society
74th Annual Meeting of the APS Division of Fluid Dynamics
Volume 66, Number 17
Sunday–Tuesday, November 21–23, 2021; Phoenix Convention Center, Phoenix, Arizona
Session M06: Flow Instability: General I
1:10 PM–3:20 PM,
Monday, November 22, 2021
Room: North 122 AB
Chair: Clarence Rowley, Princeton
Abstract: M06.00004 : Flake alignment in the secondary wave in a wide spherical Couette flow*
1:49 PM–2:02 PM
Presenter:
Tomoaki Itano
(Kansai University)
Authors:
Tomoaki Itano
(Kansai University)
Fumitoshi Goto
(Kansai University)
Masako Sugihara-Seki
(Kansai University / Osaka University)
In the present study, we performed the experimental flow visualization for the secondary wave state in the case of half radius ratio, r_in/r_out=1/2. Small aluminium flakes suspended in working fluid, which are likely to aligned by coherent structures in the secondary wave, scattered a laser light sheet on the meridian cross section.
We numerically solved the algebraic equation for the exact rotating wave state of the Navier-Stokes equation, and investigated the time variation of the trajectory and alignment of a suspended small flake in the solved rotating wave state. The experimentally recorded image is compared to the flake alignment reconstructed numerically.
*This work has been supported in part by KAKENHI (20K04294) and the EU horizon 2020 RISE program (824022), which includes Kansai University.
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