The paper presents the results of the experimental and theoretical study of the onset and stability of a solutal (buoyancy and Marangoni) convection induced by a localized source of surface-active substance in the vicinity of the interface. It was shown that, depending on dynamic Bond number value, the interaction between the buoyancy and solutocapillary convection can lead to the onset either of oscillatory convection or stationary one. The period of the observed oscillations appreciably depends on the relation of Grasshoff and Marangoni numbers and on the aspect ratio. Author presents also the results of the experimental study of the onset of convective motion induced by a sink of a surfactant placed under an interface.
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