Oscillatory marangoni convection around bubbles and drops in heterogenous solutions of surfactants

Oscillatory Regimes of Solutocapillary Marangoni Convection

“…As evident from the graph as soon as the oscillation are set up the ratio (T /τ) -1 ⋅ Ma -1 turns out to be of the same value for different fluids and remains constant during the whole experiment not depending on the orientation of the concentration gradient (all experimental points for both states are well located on the straight line, which is nearly parallel to the time axis). The obtained result supports the view that just the solutocapillary The described oscillations of the solutal flow were also observed near the interface between two mutually insoluble fluids (Kostarev et al, 2007). For experimental investigation of this case we used the chlorobenzene drop placed in an aqueous solution of isopropanol.…”

“…The vertically stratified temperature distribution in the liquid also remains stationary. In contrast to thermal Marangoni convection, the described below our experiments (Birikh et al, 2006(Birikh et al, , 2008Bushueva et al, 2008;Kostarev et al, 2004Kostarev et al, , 2006Kostarev et al, , 2007Kostarev et al, , 2008aKostarev et al, , 2008bKostarev et al, , 2009aKostarev et al, , 2009bZuev et al, 2006Zuev et al, , 2008aZuev et al, , 2008b revealed the self-oscillatory regimes of solutal convection in an aqueous solution of surfactant with vertically stratified concentration, and the threshold character of excitation of solutocapillary flows near the free bubble surface.…”

Experimental Considerations of Solutocapillary Flow Initiation on Bubble/Drop Interface in the Presence of a Soluble Surfactant

“…In order to elucidate the causes of these oscillations the dynamics of vertical distribution of the surfactant concentration and the structure of convective flows round the bubble was investigated experimentally in a thin vertical layer of a stratified fluid Kostarev et al 2007). For this purpose, the experimental cuvette having the form of HeleShaw cell was set vertically on its narrow face so that observation was made from the wide faces.…”