What is it about?
Non-uniformly heated magnetiseable ferrofluids placed in an external magnetic field can experience convective motion even in the absence of gravity, which defines their potential application in heat management systems operating in low/zero gravity conditions of space stations. When both gravitational and magnetic forcing is present, convection takes the form of competing thermogravitational waves and thermomagnetic rolls. Individually, both patterns arise as a resyult of supercritical bifurcation. However, under combined forcing one of the patterns can exist subcritically sourcing the energy from the other. We analyse conditions under which such an interesting donor/acceptor regime establishes.
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Why is it important?
Potential applications in heat management systems operating in conditions of low gravity (space stations) or extreme confinement (microelectronics), where natural gravitational convection cannot be used for effective heat removal.
Perspectives
Apart from discussing physical applications, the paper illustrates the application of pattern-interaction analysis based on the derivation of a system of coupled amplitude equations characterising the temporal evolution of patterns away from a critical (bifurcation) point, which is relevant to many other physical contexts.
Professor Sergey A. Suslov
Swinburne University of Technology Department of Mathematics
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This page is a summary of: Nonlinear interaction of thermogravitational waves and thermomagnetic rolls in a vertical layer of ferrofluid placed in a normal magnetic field, Physics of Fluids, January 2019, American Institute of Physics,
DOI: 10.1063/1.5070092.
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