抄録
The buoyancy-driven motion of an encapsulated liquid drop in liquid-liquid-gas systems was analyzed experimentally and theoretically. To investigate the accelerated motion of the encapsulated drop in detail, an optical measuring device for the local upward velocity was designed. Furthermore, a simplified effective theory based on the experimental data was proposed for the rectilinear accelerated motion of the spherical encapsulated drop produced from the compound jet in the systems. The effects of drop radius and liquid physical properties on the accelerated motion were clarified numerically. The drag components, which were composed of the steady drag term, the added mass term and the Basset history integral term, were also analyzed. The numerical results of the upward velocity quantitatively agreed with the experimental results in the range of intermediate Reynolds numbers ; Re∼O(100).
