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Phys. Rev. E 73, 056312 (2006) [13 pages]

Azimuthal motion of the mean wind in turbulent thermal convection

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Heng-Dong Xi, Quan Zhou, and Ke-Qing Xia
Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, China

Received 20 February 2006; published 26 May 2006

Wepresent an experimental study of the azimuthal motion of themean wind in turbulent thermal convection. The experiments were conductedwith cylindrical convection cells of unity aspect ratio and overthe range of the Rayleigh number from 1×10⁹ to 1×10¹⁰.The azimuthal angle of the circulation plane of the meanwind was measured using both the particle image velocimetry andflow-visualization techniques. It is found that the azimuthal motion consistsof erratic fluctuations and a time-periodic oscillation. The orientation ofthe wind is found to be "locked," i.e., it fluctuatesabout a preferred direction most of the time with allother orientations appearing as "transient states," and large excursions ofthe azimuthal angle often result in a net rotation whichtakes the wind back to the preferred orientation. The rateof erratic rotation of the circulation plane is found tohave a strong dependence on Ra. Our result suggests thatthe oscillatory motion of the wind in its vertically orientedcirculation plane and the orientational oscillation of the circulation planeitself have the same dynamic origin.

©2006 The American Physical Society

URL:	http://link.aps.org/doi/10.1103/PhysRevE.73.056312
DOI:	10.1103/PhysRevE.73.056312
PACS:	47.27.Jv; 47.27.te; 05.65.+b; 47.55.P- 47.27.Jv High-Reynolds-number turbulence 47.27.te Turbulent convective heat transfer 05.65.+b Self-organized systems 47.55.P- Buoyancy-driven flows; convection YEAR: 2006
KEYWORDS:	convection, turbulence, velocimeters, flow visualisation, fluctuations

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