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 F34: Convection and Buoyancy-driven Flows: General II
8:00 AM–9:57 AM,
Monday, November 19, 2018
Georgia World Congress Center
Room: B406
Chair: Laurence Rongy, University Libre De Brussels
Abstract ID: BAPS.2018.DFD.F34.7
Abstract: F34.00007 : Large-scale circulation in Rayleigh-B\'{e}nard convection with a Prandtl number 12.3$^*$*
9:18 AM–9:31 AM
Presenter:
Ping Wei
(School of Aerospace Engineering and Applied Mechanics, Tongji University, China)
Author:
Ping Wei
(School of Aerospace Engineering and Applied Mechanics, Tongji University, China)
An experimental study is reported of the three-dimensional spatial structure of low-frequency temperature oscillations in cylindrical Rayleigh-B\'{e}nard convection of a fluid with Prandtl number $Pr=12.3$ with aspect ratio $\Gamma \equiv D/L = 1.00$ (D is the diameter and L the height) and Rayleigh-number $Ra = 10^{11}$. The flow structure was measured using 3 sets of 8 thermal probes, each distributed uniformly around the periphery at heights $L/4, L/2$ and $3L/4$ from the bottom. As known for smaller $Pr$, the large-scale circulation (LSC) the higher $Pr$ remains a single-roll structure.
At the top/bottom layer, the LSC consisted of two well-identified cold/hot flows. These cold/hot flows traveled to mid-height and the LSC at mid-height could be described well by a sine function. The azimuthal motion of two cold/hot flows at the top/bottom layer were found to be the origin of the oscillation of the temperature field.
\vskip 0.02in
\noindent $^*$Measurements were made in collaboration with G. Ahlers at UCSB.
*Supported by the Fundamental Research Funds for the Central Universities and NSFC 8100141321.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.F34.7
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