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

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タイトル: Structure of large-scale flows and their oscillation in the thermal convection of liquid gallium
著者: Yanagisawa, Takatoshi 著作を一覧する
Yamagishi, Yasuko 著作を一覧する
Hamano, Yozo 著作を一覧する
Tasaka, Yuji 著作を一覧する
Yoshida, Masataka 著作を一覧する
Yano, Kanako 著作を一覧する
Takeda, Yasushi 著作を一覧する
発行日: 2010年 7月
出版者: American Physical Society
誌名: Physical Review E
巻: 82
号: 1
開始ページ: 016320
出版社 DOI: 10.1103/PhysRevE.82.016320
抄録: 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
資料タイプ: article
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 武田 靖


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