The rate of breakage of drops and bubbles (fluid particles) in stirred systems is of great consequence on mass

heat

and momentum transport phenomena. Therefore

over the years

the topic has gained a considerable attention from the researchers to study and characterize this phenomenon. In present work

the experimental studies of breakage phenomenon in a stirred tank in the last four decades were reviewed. The review highlighted the investigated experimental conditions and the major findings concerning the breakage mechanism and the effect of operating conditions. The discrepancy and contradictions of the outcomes of those studies were specified and discussed. Experimental observations and conclusions concerning the breakage characterization parameters

such as deformation

breakage probability

breakage time

and breakage location were presented and commented on. Possible future refinements and prospective were recommended. The review indicated that there are clear discrepancies and contradictions between previous studies regarding the effect of some operating parameters and the values of breakage time

breakage probability

number of daughter particles

and breakage location relative to the impeller. In addition

there are still many scientific gaps that need to be studied and characterized in future by overcoming specific experimental difficulties and uncertainties.