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Structure of large-scale flows and their oscillation in the thermal convection of liquid gallium

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Title: Structure of large-scale flows and their oscillation in the thermal convection of liquid gallium
Authors: Yanagisawa, Takatoshi Browse this author
Yamagishi, Yasuko Browse this author
Hamano, Yozo Browse this author
Tasaka, Yuji Browse this author →KAKEN DB
Yoshida, Masataka Browse this author
Yano, Kanako Browse this author
Takeda, Yasushi Browse this author
Issue Date: Jul-2010
Publisher: American Physical Society
Journal Title: Physical Review E
Volume: 82
Issue: 1
Start Page: 016320
Publisher DOI: 10.1103/PhysRevE.82.016320
Abstract: This investigation observed large-scale flows in liquid gallium and the oscillation with Rayleigh-Bénard convection. An ultrasonic velocity profiling method was used to visualize the spatiotemporal flow pattern of the liquid gallium in a horizontally long rectangular vessel. Measuring the horizontal component of the flow velocity at several lines, an organized roll-like structure with four cells was observed in the 1 x 10^[4]-2 x 10-[5] range of Rayleigh numbers, and the rolls show clear oscillatory behavior. The long-term fluctuations in temperature observed in point measurements correspond to the oscillations of the organized roll structure. This flow structure can be interpreted as the continuous development of the oscillatory instability of two-dimensional roll convection that is theoretically investigated around the critical Rayleigh number. Both the velocity of the large-scale flows and the frequency of the oscillation increase proportional to the square root of the Rayleigh number. This indicates that the oscillation is closely related to the circulation of large-scale flow.
Rights: ©2010 The American Physical Society
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 武田 靖

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