Study of fluid dynamic conditions in the selected static mixers part II-determination of the residence time distribution

The presented paper is the part of the complete description of fluid – dynamic conditions in the selected static mixers: Koflo and Kenics. The research was also performed for the empty pipe used as a reference state. The scope of work included the analysis of the residence time distribution in the mentioned devices for different Reynolds number for both: laminar and turbulent flow regimes. The report contains the discussion about: residence time distribution function E(t), cumulative distribution function F(t) as so as the parameters like mean residence time tm and the variance σ2. The main aim of the presented work was to show the applicability of static mixers as chemical reactors and to present their operation characteristics to evaluate the derogations distinguishing them from well known ideal states (i.e. plug flow or ideal mixing). As a result of accomplished study it was proved that Reynolds number increase results in narrower RTD in all of the tested devices, however the fluid motion is far from plug flow due to axial and radial mixing and the considered equipment should be treated as non – ideal reactors requiring some additional models for the right description. What is more, in case of laminar flow, the Kenics static mixer showed the narrowest spread and was considered as the best solution among the studied devices. In the turbulent flow, the difference between E(t) functions for all of the mentioned equipment was such small that the suggestion of small impact of inserts' type on the RTD was made. This article is protected by copyright. All rights reserved