Abstract
The locomotion of a viscous drop induced by an internal secretion of a weak surface-active substance is considered. The system consists of a viscous drop that contains another smaller droplet at an off-center location and is embedded in an unbounded viscous fluid that is free of the surfactant far from the drop. The inner droplet has a uniform concentration of the secreted material, while a non-adsorbing kinetics is used for the mass flux across the surface of the larger drop. The mass transfer results in a non-uniform distribution of interfacial tension at the outer surface and induces a Marangoni flow there and a migration of the fluid particles. The dependence of the velocities of the drops migration on the distance between the centers and on governing parameters such as the ratios of the viscosity and diffusivity of the phases is studied for the cases when the motion is induced solely by the Marangoni effect and under the combined action of gravity and thermocapillarity. Non-linear effects of convective transport at low and high Peclet numbers and of surface deformations are presented.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.