Droplet and jet morphologies using solenoid microvalves for controlled fluid dispensing

Le résumé fourni par la source

This study explores the controlled generation of droplets and jets through magnetic solenoid microvalves, a key process for achieving tailored fluid morphologies that are essential for applications in bioprinting, printed electronics, and automotive painting. High-speed imaging of droplet and jet formation using aqueous Newtonian solutions of alkali-swellable emulsion (ASE) was conducted across varying actuation frequencies, valve opening times, and applied pressures. The imaging data enabled the establishment of operational diagrams by defining key parameters, including valve opening time, actuation frequency, and applied pressure – to map the conditions required to produce diverse morphologies, including single droplets, droplets with satellites, multi-droplet formations, and continuous jets. Quantitative analyses reveal the transitions between regimes, driven by Rayleigh-Plateau instabilities and mechanical perturbations, shaping droplet elongation, jet fragmentation, and satellite formation. The microvalve operation is modeled by integrating electrical behavior, temporal magnetic field evolution, mechanical forces, and viscous effects. This predictive framework accurately maps flow rates and identifies the transition zones between different ejection regimes. By correlating droplet and jet morphologies with governing instabilities, this work enhances the understanding of solenoid microvalve dynamics, offering valuable insights for optimizing fluid dispensing in precision-driven technologies.

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