Surfactant effects on the coalescence of a drop in a Hele-Shaw cell

Experimental study of the shape and motion of flattened drops in a Hele-Shaw Cell

> The motion and shape of a flattened drop and bubble through another continuous liquid phase (conveying phase) are investigated experimentally, using a narrow gap HeleShaw cell. Seven different liquid-liqu...

Marangoni induced force on a drop in a Hele Shaw cell

On a new surfactant-driven fingering phenomenon in a Hele-Shaw cell

According to the Saffman–Taylor criterion there is no instability when a more viscous fluid is displacing a less viscous one in a Hele-Shaw cell. Yet an instability was observed experimentally (Chan et al. 1997) in the same classical set-up but with the inner walls of the cell coated with surfactant solution. Linear stability analysis is applied to reveal the basic mechanism of this new instabi...

Experimental study of a surfactant-driven fingering phenomenon in a Hele-Shaw cell

We present an experimental study of a new surfactant-driven fingering phenomenon in a Hele-Shaw cell. First, the threshold of instability is examined and compared with the linear theory. Second, the nonlinear evolution of fingering is quantified, and steady and unsteady patterns are distinguished. A wide range of dynamical behaviour is observed from drifting and merging fingers to cusp formatio...

the effect of mixed surfactant on drop-interface coalescence phenomenon

in this research, effect of bicomponent mixed surfactant was studied on drop interface coalescence phenomenon in ambient temperature. first basic chemical system was water and toluene and 0.01 gr of sodium dodecyle sulfate (sds) and the second basic system was water and toluene and 0.01 gr of cethyl trimethy amonium bromide (ctab). various weight fractions of second surfactant including 2-hepta...