Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session KP1: Poster Session (3:20-4:05pm)
Monday, November 19, 2018
Georgia World Congress Center Room: Level 1, Exhibit Hall B2 by the GFM videos
Abstract ID: BAPS.2018.DFD.KP1.37
Abstract: KP1.00037 : Horizontal motion of columnar vortices formed in rotating thermal convection
(JAMSTEC, Hokkaido Univ)
We investigated horizontal motion of columnar vortices, flow structures having coherence along the rotation axis, observed in rotating thermal convection by laboratory experiments. Thermochromic liquid crystals were employed to visualize and detect vortical structures in horizontal cross-sections with the parameters Ra = 1.0 × 107 and Ta = 1.0 × 107 - 1.0 × 108. Two different size of cylindrical fluid layers filled with water (Pr ∼ 7) were used to investigate vortex motion under the condition with or without centrifugal force effect. The method to detect and track vortex motion we established made it possible to conduct long-time interval photographing, without obtaining velocity or vorticity fields. Thanks to this and the long time measurements O(103 s), some statistical analyses to clarify the diffusive motion of columnar vortices had been achieved. Interesting characteristics of columnar vortices, such as generation, disappearance, merging, repellence, and limitation of lifetime, enable them to behave as like anomalous diffusion.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.KP1.37
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