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The effect of periodically moving boundaries on thermomagnetic convection in ferrofluids
Ist Teil von
Physics of fluids (1994), 2010-11, Vol.22 (11), p.114106-114106-18
Ort / Verlag
Melville, NY: American Institute of Physics
Erscheinungsjahr
2010
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The thermomagnetic instability in a horizontal layer of ferrofluids heated from below, with the boundaries oscillating periodically about zero or nonzero mean velocity, in the presence of vertical magnetic field is investigated numerically. The two boundaries are considered rigid, kept at fixed values of temperature, and are magnetically permeable. Chebyshev tau method and Floquet theory are used to discuss the stability of the flow. Oscillatory shear flow is observed to affect the onset of instability as convective patterns in the form of rolls in the direction transverse to the shear flow. Oscillatory solutions synchronous to the frequency of modulation are observed. Subharmonic solutions have not been detected in the considered range of parameters. The amplitude and the frequency of oscillation of the velocity of the rigid boundaries affect the flow field of vertical velocity, temperature field, and the magnetic potential significantly.