On Modeling Drop Impacts at Shallow Angles on Flowing Soap Films

Abstract eng:
Small drops impinging on soap films flowing at an angle exhibit three fundamental post-impact dynamics regimes: (a) the drop pierces through the film, (b) it coalesces with the flow, and (C) it bounces off the surface. During impact, the drop deforms along with bulk elastic deformation of the film. The system thus presents the rare opportunity to explore in-tandem effects of bulk elasticity and hydrodynamics. For shallow angles of film inclination, bounce-off regime predominates. We outline the analytical framework to characterize the impact dynamics. The model assumes a deformable drop and a deformable three-dimensional film, and invokes phase space based parametric analysis. Results can offer a significant step towards optimizing interactions between a spray and a flowing liquid. Findings for the bounce-off case also indicate a momentum transfer leading to vortex dipole shedding, along with capillary wave generation. Such an impulsive regime can be relevant for biolocomotion of water-walking animals.

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