measured the liquid-phase mixing time in solid–liquid
systems by a conductivity method, and revealed an increase in
mixing time when particles were added. They explained the
increase was because the suspended solid–liquid interface consumed much energy from the rotating impeller.also reported that the presence of solid particles led to a pronounced lengthening of mixing time using the decoloration
method. However,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. Recently ) 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.