AM05-24-010 静止液中における単一液滴の終端速度(混相流・機能性流体2,一般講演)

概要

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Terminal velocities of single drops and bubbles rising through stagnant liquids were measured under the same ranges of Reynolds, Eotvos and Morton numbers, Re, Eo and M. The effects of surfactants on terminal velocities were also examined. As a result, the following conclusions were obtained: (1) The viscosity ratio κ is one of the important parameters governing the terminal velocity and shape of a drop. The terminal velocity and the distortion factor, γ, decrease with increasing κ due to the change in internal circulation. (2) Surfactants decrease the terminal velocity of a drop. However, this effect becomes weaker as κ increases. This tendency is consistent with the Levich theory. (3) In contrast to single bubbles, the aspect ratio and terminal rising velocity of a drop are not affected by initial shape deformation due to the strong viscous damping of shape oscillation, and therefore, they are uniquely determined by Eo, M and κ.
日本流体力学会の論文
2005-09-05