Advance in research on residence time distribution in mixers

It is important to study the residence time distribution in mixers for a better understanding of flow and mixing. The statistical parameters for describing the RTD are introduced and the different experimental methods for RTD are presented according to the measurement principles and different modes for tracer inputting. The developments of model simulation in chemical reaction engineering method for RTD and flow field simulations for RTD are described. Comparison analysis is made for the choice of different models in flow field simulation. Finally，the applications of statistical methods in RTD are discussed. Future research and development of RTD methods are discussed.