高速気流に伴われる水平長方形管内薄膜流の流動機構に関する実験的研究

概要

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Characteristics of both the thin liquid and the high speed gas layers in a separated flow were experimentally investigated. The result shows that liquid film with a film Reynolds number less than 170 moves, at least near the gas-liquid interface, with a velocity much higher than that obtained by assuming a laminar liquid film flow. The equivalent sand roughness of the liquid film surface increase with the gas velocity even when waves are inside a viscous sublayer of the gas flow. This is because the normal component of the gas velocity need not be zero at the gas-liquid interface. Due to this velocity fluctuation the gas particle with a higher velocity can penetrate into the liquid film; then the energy loss in the gas phase becomes large while the liquid velocity at the inter face can be much higher than that of a laminar liquid film flow. As a result, it is concluded that even a thin liquid layer with a small Reynolds number can not be assumed laminar when it is forced to flow by a high speed gas flow.
一般社団法人日本機械学会の論文
1986-12-25