Onset condition of modulated Rayleigh-Bénard convection at low frequency.
The onset condition of convection in a layer of fluid bounded by isothermal walls, with lower temperature varying sinusoidally in time at very low nondimensional modulation frequency, is derived in closed form, based on the Floquet theory and using a matched-asymptotic WKB method.
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Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, California 90095-1597, USA.