Maximum Spreading of Impacting Ferrofluid Droplets under the Effect of Nonuniform Magnetic Field

Qian-Ping Li, Yi Ouyang, Xiao-Dong Niu, Youhua Jiang, Ming-Fu Wen, Ze-Qin Li, Mu-Feng Chen, De-Cai Li, Hiroshi Yamaguchi

Research output: Contribution to journalArticlepeer-review

Abstract

This article investigates the maximum spreading of ferrofluid droplets impacting on a hydrophobic surface under nonuniform magnetic fields. A generalized model for scaling the maximum spreading is developed. It is observed that, if the magnetic field strength is zero, a ferrofluid droplet not only demonstrates similar spreading dynamics as the water droplet but also obeys the same scaling law for the maximum spreading factor. Therefore, this article emphasizes the effects of magnetic field strength. In this regard, a dimensionless parameter (Nm) is introduced as the ratio between inertial force and Kelvin force, with an assumption that the kinetic energy mainly transforms to thermal energy. This parameter allows us to rescale all experimental data on a single curve with the Padé approximant, which is applicable to a wide range of impact velocities and magnetic field strengths. © 2022 American Chemical Society.
Original languageEnglish
JournalLangmuir
DOIs
StatePublished - 18 Feb 2022

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