天井近くで加熱された水平円柱まわりの自然対流のカオス的挙動

概要

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This study aims at revealing the effect of a flat ceiling on the flow and heat transfer performance around an isothermally heated horizontal cylinder. The experiment for air is performed at Rayleigh numbers ranging from 4.8×10^4 to 1.0×10^7. We show three types of flow patterns depending on Rayleigh number, the distance between the ceiling and the cylinder, and the temperature condition of the ceiling. These patterns are : a three-dimensional unsteady flow wherein the ascending flow along the cylinder separates in the upper part of the cylinder, a two-dimensional steady flow, and an oscillatory flow. The unsteady flows are shown to be chaotic by calculations of a set of Liapunov exponents from the observed time series of a single variale.
一般社団法人日本機械学会の論文
1994-10-25