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The development of Marangoni convection induced by local addition of a surfactant

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Abstract

The development of concentration convection induced by local addition of a surfactant solution onto a horizontal free surface of water is studied experimentally and theoretically. The experiment revealed that the capillary motion develops in a threshold manner, with the threshold value depending on the degree of purification of the fluid, the initial concentration of the surfactant, and the area of the free surface. To describe the threshold mechanism of the concentration convection, a number of theoretical models is considered. Different rheological properties of the surface phase, including the nonlinear dependence of the surface shear stress on the surface velocity, are examined. In the numerical experiment, the convective-flow patterns are calculated for different free-surface boundary conditions, and the time dependence of the flow intensity is investigated.

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Original Russian Text © R.V. Birikh, M.O. Denisova, K.G. Kostarev, 2011, published in Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, 2011, Vol. 46, No. 6, pp. 56–68.

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Birikh, R.V., Denisova, M.O. & Kostarev, K.G. The development of Marangoni convection induced by local addition of a surfactant. Fluid Dyn 46, 890–900 (2011). https://doi.org/10.1134/S0015462811060068

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  • DOI: https://doi.org/10.1134/S0015462811060068

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