The flow structure of a continuous-flow reactor stirred by a Rushton turbine was investigated by laser Doppler velocimetry for two different mean residence time-mixing time ratios. Velocity measurements were obtained for two inlet locations, corresponding to the incoming liquid stream being fed co-currently or counter-currently to the flow discharged by the turbine. In all investigated configurations and for all. operating conditions, it was found that the flow disruption caused by the incoming liquid stream was observable mainly in the first vessel quarter, which followed the feed-tube plane. From comparison of the velocities encountered in the various planes,in the continuous-flow reactor to the velocities of the batch reactor, it was also concluded that it may be possible to intensify the usage of the turbine-stirred, vessel by decreasing the characteristic times ratio, without considerable flow by-pass and/or short-circuiting problems. problems.