Imperial College London

Professor Omar K. Matar

Faculty of EngineeringDepartment of Chemical Engineering

Vice-Dean (Education), Faculty of Engineering
 
 
 
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Contact

 

+44 (0)20 7594 9618o.matar Website

 
 
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Assistant

 

Miss Nazma Mojid +44 (0)20 7594 3918

 
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Location

 

506ACE ExtensionSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Conroy:2017:10.1007/s10665-017-9938-2,
author = {Conroy, D and Matar, OK},
doi = {10.1007/s10665-017-9938-2},
journal = {Journal of Engineering Mathematics},
pages = {253--268},
title = {Dynamics and stability of three-dimensional ferrofluid films in a magnetic field},
url = {http://dx.doi.org/10.1007/s10665-017-9938-2},
volume = {107},
year = {2017}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - We consider the interfacial dynamics of a thin, ferrofluid film flowing down an inclined substrate, under the action of a magnetic field, bounded above by an inviscid gas. The fluid is assumed to be weakly conducting, and its dynamics are governed by a coupled system of the steady Maxwell, Navier–Stokes, and continuity equations. The magnetization of the film is a function of the magnetic field, and is prescribed by a Langevin function. We make use of a long-wave reduction in order to solve for the dynamics of the pressure, velocity, and magnetic fields inside the film. The potential in the gas phase is solved by means of Fourier Transforms. Imposition of appropriate interfacial conditions allows for the construction of an evolution equation for the interfacial shape, via use of the kinematic condition, and the magnetic field. We study the three-dimensional evolution of the film to spanwise perturbations by solving the nonlinear equations numerically. The constant-volume configuration is considered, which corresponds to a slender drop flowing down an incline. A parametric study is then performed to understand the effect of the magnetic field on the stability and structure of the interface.
AU - Conroy,D
AU - Matar,OK
DO - 10.1007/s10665-017-9938-2
EP - 268
PY - 2017///
SN - 0022-0833
SP - 253
TI - Dynamics and stability of three-dimensional ferrofluid films in a magnetic field
T2 - Journal of Engineering Mathematics
UR - http://dx.doi.org/10.1007/s10665-017-9938-2
UR - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000415363400014&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR - http://hdl.handle.net/10044/1/56302
VL - 107
ER -