Ferrofluid hydrodynamics: waves, jets and free drops

Potts, H.E. and Diver, D.A. (2001) Ferrofluid hydrodynamics: waves, jets and free drops. Brazilian Journal of Physics, 31(3), 433 -440. (doi:10.1590/S0103-97332001000300014)

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Abstract

A novel approach to hydrodynamical studies uses the bulk force properties of magnetic liquids to probe the dynamics of (i) freely suspended drops; and (ii) unstable surface waves and jets. The fluid dynamics are imaged by a fast CCD camera, allowing thorough analysis of these time-dependent phenomena. Ferrofluid drops are freely suspended in air by using magnetic fields to create an attractive force opposing gravity. The suspended drop then undergoes forced oscillations by perturbing the supporting magnetic field, and exhibits high order nonlinear modes of oscillation which can be driven until the drop bifurcates. Fluid surface waves and jets are investigated in cylindrical geometry. Nonlinear waves are magnetically driven, resulting in dramatic jets when the critical amplitude is exceeded. Such jets are observed to have a maximum acceleration exceeding 70g.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Potts, Dr Hugh and Diver, Professor Declan
Authors: Potts, H.E., and Diver, D.A.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Brazilian Journal of Physics
ISSN:0103-9733
ISSN (Online):1678-4448

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