found that, regardless of the state of suspension, solids of
relatively low concentrations had little influence on the mixing
time as compared to water alone; but for relatively large solids
concentrations, the dimensionless mixing time first increased until
it reached a maximum and then decreased again to approach the
single-phase value with increasing impeller speeds.studied the liquid mixing time in the presence of
another immiscible liquid using the conductivity method. The
increase in the macro-mixing intensity of the continuous liquid
phase was detected at low dispersed phase holdups while the
damped macro-mixing intensity of the continuous phase was
found at higher dispersed phase volume percentages.