Open AccessNumerical study of ferro‐droplet breakup initiation induced by a slowly rotating uniform magnetic field
Author(s) -
Radcliffe Alastair J.
Publication year - 2021
Publication title -
engineering reports
Language(s) - English
Resource type - Journals
ISSN - 2577-8196
DOI - 10.1002/eng2.12316
Subject(s) - ferrofluid , breakup , magnetic field , rotation (mathematics) , mechanics , rotating magnetic field , classical mechanics , physics , viscosity , finite element method , field (mathematics) , boundary value problem , materials science , condensed matter physics , geometry , thermodynamics , mathematics , quantum mechanics , pure mathematics
The fully three‐dimensional start‐up deformations and accelerations of initially spherical magnetically susceptable linearly magnetizable ferrofluid droplets, driven by a rotating uniform magnetic field, are investigated through the use of coupled finite element/boundary element computer simulations. For given magnetic susceptability, a critical viscosity is suggested, proportional to both magnetic field strength and rotation speed, below which the deformations of the initially spherical droplet inevitably lead to breakup, but above which a simple persistent spheroidal solid body rotation is attained.