Spatial Instabilities and Onset of Chaos in Rayleigh-Benard System with Intermediate Aspect-Ratio

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概要

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• We present experimental studies of structural instabilities of convective rolls andthe onset of chaos of a Rayleigh-Benard convection system of water in a rectangularcontainer with an intermediate aspect-ratio. Dynamical process of wavenumber reduc-Lion was observed by flow-visualization. It was found that the structural instability oc-curs along an instability boundary which is close to the ones calculated for an infiniteaspect-ratio system. A very slow oscillation - 0.9 mHz was found to set in first atR= 13.4R. in the region where knot and cross-roll instability lines for an infinitesystem meet each other. Subsequently, ordinary Hopf modes appeared at R = 16.5R.and 17.6R. and then the system was found chaotic. A possible origin of the slowoscillation in terms of the competition between the roll states of slightly differentwavenumbers was discussed.chaos, Rayleigh-Benard convection, intermediate aspect-ratio, wave-numberselection, instabilities of roll structure, slow oscillation, skewed-varicose instabil-ity, experimental study

• 社団法人日本物理学会の論文
• 1988-10-15

著者

• SANO Masaki

  Research Institute of Electrical Communication, Tohoku University

• SAWADA Yasuji

  Research Institute of Electrical Communication, Tohoku University

• Sano Masaki

  Research Institute Of Electrical Communication Tohoku University:the James Franck Institute The Univ

• Sawada Yasuji

  Research Center For Electrical Communication Tohoku University

• Sano Masaki

  Research Institute For Electrical Communication Tohoku University

• NASUNO Satoru

  Research Institute of Electrical Communication,Tohoku University

• Nasuno Satoru

  Research Institute Of Electrical Communication Tohoku University

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