Abstract
A numerical study is conducted on a natural convection flow in a differentially heated cavity of aspect ratio 4, submitted to a small-extend thermal disturbance localized on the hot wall. The disturbance is a sinusoidally-varying thermal oscillation applied to the hot wall temperature on an area representing 10% of the whole hot wall. The influence of the disturbance location and frequency is investigated with the aim of acting on the flow and consequently maximizing heat transfers. The Rayleigh number is set at RaH=9×107 and the working fluid is air. Results show that the optimal disturbance location is at the top of the hot wall. The maximal heat transfers are obtained for two disturbance frequencies: the frequency of internal gravity waves and a very low frequency, for which the gain is higher. The disturbance is also responsible for the emergence of travelling waves and the resulting unsteady behavior of the flow is enlightened.
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