液柱内マランゴニ対流における振動流遷移とモード構造 : 熱工学,内燃機関,動力など

概要

論文の詳細を見る
A large number of terrestrial experiments have been conducted on Marangoni convection in a liquid bridge to date. The limitation in the terrestrial experiments lies in the maximum size of the bridge and thus in the maximum attainable Marangoni number under the normal gravity. In the present study, a series of experiments was performed in a low temperature environment in order to realize a large temperature difference between the both ends of the bridge to attain a high Marangoni number in spite of a small size of the bridge while suppressing the evaporation of the fluid. The test fluid was silicone oil of 1, 2 and 5 cSt. The temperature difference ΔT was increased gradually and a critical point of transition from steady to oscillatory flow was obtained. With increase of ΔT, a pulsative oscillatory mode and then a rotational one became discernable. In this series of experiments a wide range of aspect ratio of the bridge was concerned and thus flow structures with mode number m=1, 4, 5 and 6 were realized. The product of the mode number and the aspect ratio was found to be approximately unity as often pointed out.
2001-06-25