The liquid mixing in a pitched blade stirred tank was studied by the non-intrusive planar laser induced fluorescence technique.The mixing behavior in the centric and eccentric stirring operations was evaluated with the parameters such as the uniformity index and the 95% mixing time calculated based on the measured tracer concentration distribution.The results show that the eccentric operation exhibits better mixing performance than the centric operation

owing to its asymmetrical flow.The mixing time is a local variable

depending on the monitoring point

but the variation in the mixing time is small in the eccentric stirred tank.