Origin of the temperature oscillation in turbulent thermal convection

Heng Dong Xi, Sheng Qi Zhou, Quan Zhou, Tak Shing Chan, Ke Qing Xia

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摘要

We report an experimental study of the three-dimensional spatial structure of the low-frequency temperature oscillations in a cylindrical Rayleigh-Bénard convection cell. Through simultaneous multipoint temperature measurements it is found that, contrary to the popular scenario, thermal plumes are emitted neither periodically nor alternately, but randomly and continuously, from the top and bottom plates. We further identify a new flow mode-the sloshing mode of the large-scale circulation (LSC). This sloshing mode, together with the torsional mode of the LSC, are found to be the origin of the oscillation of the temperature field.

源语言英语
文章编号044503
期刊Physical Review Letters
102
4
DOI
出版状态已出版 - 26 1月 2009
已对外发布

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