To gain deep insight into the hydrodynamic behaviors of multi-phase flow reactors (MPFRs) and guide the model and scale-up of industrial reactors

the measuring techniques progress of hydrodynamic parameters in MPFR which were widely used in the field of modern coal chemical and petrochemical industry was summarized. Based on the classification of invasive or non-invasive measurement

the basic principles of existing measuring techniques were selectively outlined

along with applicability and limitations inherent to each technique. The suitable measuring techniques for industrial reactors were recommended

and the development trend of hydrodynamic measurement in the future was expected.