くさび形容器内のセル状熱対流

概要

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Cellular thermal convection in a wedge-like vessel, heated from horizontal lower plate and cooled from inclined upper plate, is visculized, and effects of the inclination angle of the upper plate and of the aspect ratio on the onset of thermal convection and on the cellular pattern are investigated experimentally.<BR>As the inclination angle is increased, cellular convection is induced at lower value of local Rayleigh number, independently of the aspect ratio.<BR>Cellular patterns can be classified into two groups : longitudinal cellular patterns, which consists of roll cells with their axis parallel to the dirdction of inclination, and transversal cellular patterns, where roll cells are arranged perpendicularly to the direction of inclination.<BR>These patterns are predominantly controlled by global conditions such as the aspect ratio and the angle of inclination.<BR>The width of a roll cell is not dependent on the kind of cellular pattern but on local conditions such as the local depth of fluid layer.
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