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Spontaneous flow reversals in Rayleigh-Bénard convection of a liquid metal

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Title: Spontaneous flow reversals in Rayleigh-Bénard convection of a liquid metal
Authors: Yanagisawa, Takatoshi Browse this author
Yamagishi, Yasuko Browse this author
Hamano, Yozo Browse this author
Tasaka, Yuji Browse this author
Takeda, Yasushi Browse this author
Issue Date: Mar-2011
Publisher: American Physical Society
Journal Title: Physical Review E
Volume: 83
Issue: 3
Start Page: 036307
Publisher DOI: 10.1103/PhysRevE.83.036307
Abstract: We report a finding of spontaneous flow reversals of roll-like patterns in liquid gallium Rayleigh-Bénard convection. The vessel has a square geometry with an aspect ratio of 5, and a horizontal magnetic field is applied to align the rolls. The flow patterns were visualized by ultrasonic velocity measurements, and the processes of the reversal were clearly observed. The basic flow pattern observed in the vessel is a four-roll structure with its axis parallel to the magnetic field. Emergence of a new circulation at a corner of the vessel causes flow reversal with reorganization of the whole pattern. The flow keeps relatively steady four-roll structure for most of the duration, while the reversal of it is over in a short time. The reversals of the flow occur randomly with the interval time between reversals being much longer than the circulation time.
Rights: ©2011 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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