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 L33: Turbulent Convection II
4:05 PM–6:41 PM,
Monday, November 19, 2018
Georgia World Congress Center
Room: B405
Chair: Charles Doering, University of Michigan
Abstract ID: BAPS.2018.DFD.L33.3
Abstract: L33.00003 : Flow topology transition via global bifurcation in turbulent Rayleigh-Benard convection*
4:31 PM–4:44 PM
Presenter:
Yi-Chao Xie
(The Chinese University of Hong Kong)
Authors:
Yi-Chao Xie
(The Chinese University of Hong Kong)
Guang-Yu Ding
(The Chinese University of Hong Kong)
Ke-Qing Xia
(The Chinese University of Hong Kong)
We present experimental observation of a spontaneous symmetry breaking induced transition in turbulent Rayleigh-Benard convection. The experiment was carried out in a vertical annulus convection cell with the aspect ratio Γ=H/(2Ro)=1.87 and the radius ratio γ=Ri/Ro=0.88. Here H=100.0 mm is the height of the cell, Ri=84.5 mm and Ro=96.0 mm are the radius of the inner and outer sidewalls, respectively. Simultaneous measurements of the heat transport, i.e., the Nusselt number, and the topology of the LSF were performed. It is found that the heat transport shows a sharp transition with the increase of the Rayleigh number Ra in the range of 6.0×107≤ Ra ≤ 1.3×109 and at fixed Prandtl number Pr=5.4. Analysis of the LSF structure suggests that the transition is resulted from a global bifurcation of its pattern from a high-symmetry quadruple structure (QS) to a low-symmetry dipole structure (DS). In the transition zone spanned about half a decade in Ra, the system switches stochastically between the two metastable QS and DS states [1].[1]Xie, Ding and Xia, Phys. Rev. Lett. 120, 214501 (2018)
*This work is supported by the Hong Kong Research Grant Council under Grant No.14301115.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.L33.3
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