Vaporization of single liquid drops in an immiscible liquid Part I: Forms and motions of vaporizing drops

Vaporization process of single drops of pentane or furan in an aqueous glycerol has been studied photographically in the region where the geometrically simple configuration and rectilinear motion of vaporizing two-phase bubbles are realized. The instantaneous velocity of rise of two-phase bubbles agreed approximately with Stokes' theory in the range Re < 1. The liquid-liquid interfacial area takes almost a constant value slightly higher than the initial surface area of the liquid drop in the range below 10% of the vaporization ratio, and then reduces gradually. The vaporization does not bring an effective increase of heat transfer area.