Drop volumes and terminal velocities in aqueous two phase systems

The terminal velocities and sizes of drops in aqueous two-phase systems formed by PEG (4000)-sodium sulphate-water, PEG (6000)-sodium sulphate-water and PEG (4000)-dextran-water were measured. Nozzle sizes were varied from 1.0 to 2.5 mm and the drops were formed of both light and heavy phases. Based on video photographic analysis for drop formation, the shape of the drop during formation was found to have an important bearing on the drop volume. Therefore a generalised model was developed using the video photographic measurements. A correlation was developed for the terminal velocities of the drops in aqueous two phase systems, which covers Morton numbers from 0.00211 to 11050 and Eotvos numbers from 0.091 to 288