OSCILLATORY MODES OF SOLUTOCAPILLARY MARANGONI CONVECTION AT A DROP-LIQUID INTERFACE
The concentration convection in an isothermal liquid with a surfactant concentration gradient, arising near a fluid drop clamped between the vertical walls of a horizontal channel is studied numerically within the framework of simple mathematical model with the surface phase at the drop-liquid interface formed by adsorption /desorption process. The interaction between the buoyancy and the Marangoni convective flows is responsible for the onset of auto-oscillation regime. In numeric experiments, more than 20 outbursts of the Marangoni convection were observed. Such oscillations have been experimentally investigated with the help of interferometric technique. The surfactant distributions obtained numerically at different oscillation phases agree well the experimental data.