Effect of time-varying magnetic field on metal droplet profiles

• Published in: Indian journal of physics 2020-07, Vol.94 (7), p.969-973
• Main Authors: Cui, Kai, Zhao, Zhilong, Ma, Li, Liu, Wenbin, Li, Dongyang, Ma, Xiaohu
• Format: Article
• Language: English
• Subjects: Astrophysics and Astroparticles; Contact angle; Contact stresses; Curvature; Damping; Decay rate; Droplets; Laplace equation; Magnetic fields; Magnetism; Mathematical analysis; Original Paper; Physics; Physics and Astronomy; Surface tension; Temperature effects
• ISSN: 0973-1458; 0974-9845
• DOI: 10.1007/s12648-019-01549-w

A nonmagnetic metal droplet with dynamic interfaces under a time-varying magnetic field was considered. Considering that the thermal effect of the magnetic field and the droplet evaporation were disregarded, we obtained the magnetically augmented Young–Laplace equation theoretically according to the normal stress balance principles. The droplet contact angle was further determined according to the droplet volume conservation. According to the curvature and contact angle, the droplet profile was mathematically determined. Results showed that a downward magnetic force caused droplet contraction and an upward force caused expansion. The increase in surface tension hindered the droplet spreading without affecting the change trend of droplet shape parameters. The increase in angular frequency ( ω ) decreased the variation amplitude of the droplet curvature and contact angle, and the increase in damping factor ( τ ) slowed down the decay of the droplet curvature and contact angle.