Abstract
Most existing studies of droplet freezing on cold solid surfaces focus on the use of different surface wettability and roughness which may be considered as passive methods. Here we report an active method using an applied magnetic field to control the deformation and freezing process of a sessile ferrofluid droplet on a cold surface. By changing the direction and magnitude of the magnetic field, we can elongate or squeeze the shape of ferrofluid droplets. Consequently, the droplet freezing time can be extended or shortened under the magnetic lift or squeezing conditions, respectively. Additionally, we use the modified Young-Laplace equation with consideration of an additional magnetic force effect to analyze the shape variation of a ferrofluid droplet with magnetic field, and also present a scaling analysis for the freezing time.
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