title: Thermocapillary effect on the dynamics of viscous beads on vertical fiber.
abstract: The gravity-driven flow of a thin liquid film down a uniformly heated vertical fiber is considered. This is an unstable open flow that exhibits rich dynamics including the formation of droplets, or beads, driven by a Rayleigh-Plateau mechanism modified by the presence of gravity as well as the variation of surface tension induced by temperature disturbance at the interface. A linear stability analysis and a nonlinear simulation are performed to investigate the dynamic of axisymmetric disturbances. The results showed that the Marangoni instability and the Rayleigh-Plateau instability reinforce each other. With the increase of the thermocapillary effect, the fiber flow has a tendency to break up into smaller droplets.
authors.affiliation: Key Laboratory of Microgravity (National Microgravity Laboratory), Institute of Mechanics, Chinese Academy of Sciences, Beijing, China 100190.
authors.forename: Rong
authors.initials: R
authors.lastname: Liu
authors.affiliation: Key Laboratory of Microgravity (National Microgravity Laboratory), Institute of Mechanics, Chinese Academy of Sciences, Beijing, China 100190.
authors.forename: Qiu Sheng
authors.initials: QS
authors.lastname: Liu
mesh_terms: D002197:Capillary Action; D003198:Computer Simulation; D006112:Gravitation; D016014:Linear Models; D008962:Models, Theoretical; D017711:Nonlinear Dynamics; D013500:Surface Tension; D013696:Temperature; D014783:Viscosity