Abstract
The oscillating properties of a fluid submitted to Rayleigh-Benard convection have been studied by measurements of the local convective velocity, here in silicone oil of 0.1 cst viscosity. Intermittent oscillations first occur, then when increasing ϵ the velocity becomes continuously oscillating. The fundamental frequency varies as ϵ -2/3 where ϵ=( R- R c)/ R c, R being the Rayleigh number and R c the critical one. For very large values of ϵ (> 2000), the fundamental frequency of the oscillations disappear to give rise to a broad turbulent spectrum.
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