(128f) Thermocapillary Motion Of Hybrid Drops

Hybrid drops are comprised of two or more immiscible phases. They occur in various natural and technological processes and environments, e.g. the atmosphere, liquid membranes and liquid bi-layers, direct contact heat and phase separation processes. The dynamics of such drops in a viscous fluid received only limited attention so far. When the capillary number associated with such hybrid drops' motion is negligibly small the compounds preserve the shapes of spherical surface segments between the immiscible phases. We apply conformal mapping techniques to study the dynamics of hybrid drops under the action of gravity and thermocapillary forces. Results concerning the dynamics of the drops and the flow fields for axisymmetric case studies are presented for a variety of the physical parameters involved such as viscosity ratios, contact angles and relative volumes of the phases.