Plastocapillarity

Many problems in engineering and geophysics feature the free surface flow of a viscoplastic fluid. Although negligible at large scales (e.g. lava flows landslides), capillary forces may become significant small coating polymeric materials 3D printing). The effect yield stress on spreading droplets is considered. Experiments, asymptotic solutions, numerical simulations are used to explain droplets' dynamics their final shape. Additionally, new technique proposed externally control droplet's shape using temperature-dependent rheology. Finally, general importance plastocapillarity (when yield-stress fluids driven by tension) design manufacturing discussed.