水平円柱側壁に沿って流下する液膜流れの挙動に関する研究 : 液膜のはく離機構(流体工学,流体機械)

概要

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A standing wave with a peak line toward downstream appears on the surface of a liquid film flowing around a horizontal circular cylinder. The amplitude of the wave grows in the downward direction and finally a part of the wave separates from the film at certain position on the cylinder. A theoretical model was proposed to explain the physical mechanism of separation. The wave peak would separate when the resultant of the centrifugal force, gravitational force, surface tension and negative pressure acting on the wave root is not sufficient to supply the flow rate necessary to maintain the wave amplification. The points of separation on the cylinder were theoretically calculated from the above condition for three kinds of test liquids, i. e., water, ethanol and glycerin solutions. The results agree with those from experiments for various flow rates of the film flow.
一般社団法人日本機械学会の論文
2003-10-25