Abstract
Fluid droplet manipulation by external magnetic field has attracted increasing attention through years motivated by its wide applications including micro-electro-mechanical systems (MEMS), enhanced oil recovery (EOR), water decontamination, chemical reaction control, and many more. The confined deformation of a fluid droplet immersed immiscibly in a ferrofluid in a Hele-Shaw cell when exposed to a sub-Hertz rotating magnetic field is experimentally and theoretically investigated. For the first time in this frequency range, experimental results reveal that the droplet deformation is weakened by increasing magnetic field rotation frequency. The droplet deformation was then modeled as forced vibration with damping to describe the impact of the rotation frequency and magnetic field strength. The results enable a method to predict the confined droplet behavior immersed in ferrofluid for micro-scale applications, e.g., flow actuators and deformable rotors.
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