Modeling bubbles and droplets in magnetic fluids

Mark S. Korlie, Arup Mukherjee, Bogdan G. Nita, John G. Stevens, A. David Trubatch, Philip Yecko

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

We develop, test and apply a volume of fluid (VOF) type code for the direct numerical simulation of two-fluid configurations of magnetic fluids with dynamic interfaces. Equilibrium magnetization and linear magnetic material are assumed and uniform imposed magnetic fields are considered, although extensions to nonlinear materials and to fields with spatio-temporal variability are possible. Models are computed for configurations of bubbles of non-magnetic fluid rising in ferrofluid and droplets of ferrofluid falling through non-magnetic fluid. Bubbles and droplets exhibit similar changes of shape in the presence of vertical fields, due to a combination of elongation along the field lines and the fluid dynamics of ordinary rising or falling at small Bond number. Bubbles become more prolate than droplets under the same parameters and are accordingly found to break up more readily than droplets in stronger fields. Indirect effects are observed, such as the change in rise time and the consequent changes in the flow due to increased Reynolds number.

Original languageEnglish
Article number204143
JournalJournal of Physics Condensed Matter
Volume20
Issue number20
DOIs
StatePublished - 21 May 2008

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Magnetic fluids
Bubbles (in fluids)
bubbles
Fluids
fluids
ferrofluids
falling
Phosmet
Magnetic materials
Direct numerical simulation
Bond number
Fluid dynamics
Elongation
Magnetization
fluid dynamics
configurations
magnetic materials
Reynolds number
direct numerical simulation
elongation

Cite this

Korlie, Mark S. ; Mukherjee, Arup ; Nita, Bogdan G. ; Stevens, John G. ; Trubatch, A. David ; Yecko, Philip. / Modeling bubbles and droplets in magnetic fluids. In: Journal of Physics Condensed Matter. 2008 ; Vol. 20, No. 20.
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Modeling bubbles and droplets in magnetic fluids. / Korlie, Mark S.; Mukherjee, Arup; Nita, Bogdan G.; Stevens, John G.; Trubatch, A. David; Yecko, Philip.

In: Journal of Physics Condensed Matter, Vol. 20, No. 20, 204143, 21.05.2008.

Research output: Contribution to journalArticle

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AU - Korlie, Mark S.

AU - Mukherjee, Arup

AU - Nita, Bogdan G.

AU - Stevens, John G.

AU - Trubatch, A. David

AU - Yecko, Philip

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AB - We develop, test and apply a volume of fluid (VOF) type code for the direct numerical simulation of two-fluid configurations of magnetic fluids with dynamic interfaces. Equilibrium magnetization and linear magnetic material are assumed and uniform imposed magnetic fields are considered, although extensions to nonlinear materials and to fields with spatio-temporal variability are possible. Models are computed for configurations of bubbles of non-magnetic fluid rising in ferrofluid and droplets of ferrofluid falling through non-magnetic fluid. Bubbles and droplets exhibit similar changes of shape in the presence of vertical fields, due to a combination of elongation along the field lines and the fluid dynamics of ordinary rising or falling at small Bond number. Bubbles become more prolate than droplets under the same parameters and are accordingly found to break up more readily than droplets in stronger fields. Indirect effects are observed, such as the change in rise time and the consequent changes in the flow due to increased Reynolds number.

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