Oscillatory Marangoni convection around the air bubble in a vertical surfactant stratificationConvection de Marangoni oscillante autour d'une bulle d'air dans une stratification verticale surfactante |
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Authors: | Konstantin Kostarev Andrew Zuev Antonio Viviani |
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Institution: | 1. Institute of Continuous Media Mechanics UB RAS, Acad. Korolev Str. 1, 614013 Perm, Russia;2. Seconda Universita di Napoli, via Roma 29, 81031 Aversa, Italy |
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Abstract: | The solutocapillary Marangoni convection around a gas bubble in the inhomogeneous binary mixture of miscible fluids with a vertical surfactant concentration gradient was studied experimentally. A new phenomenon, the oscillatory instability of the surfactant mass transfer, near the bubble boundary, was detected and investigated. The interpretation of this effect as an interaction between the surfactant adsorption at the bubble free surface and solutocapillary and buoyancy convective mechanisms is proposed. The experimental data on oscillation period in relation to bubble dimensions, time, liquid layer thickness, physico-chemical fluid parameters and concentration gradients are presented and discussed. To cite this article: K. Kostarev et al., C. R. Mecanique 332 (2004). |
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Keywords: | Fluid mechanics Bubbles Miscible liquids Marangoni convection Solutocapillary flow Mécanique des fluides Bulles Liquides miscibles Convection de Marangoni Ecoulement soluto-capillaire |
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