Influence of experimental setup on observed values of mixing time in gas‐stirred liquids

Mixing time of metallurgical reactors is gaining increasing importance. At first sight one single mixing time should be expected, being characteristic with regard to a given reactor and to given stirring conditions. The aim of the present paper is to call attention to the influence of the location of tracer injection and of the experimental method on the observed value of the mixing time. Two mixing times have been defined, namely “local mixing time” and “global mixing time”. The results have been compared with those of the literature. Partly, there is good agreement with some published correlations.