Flow pattern at Laminar Regime with low viscosity fluid

It is well known that Reynolds number differs between agitator tanks of varying sizes, even when using the same fluid. This is a significant challenge for engineers and researchers undertaking scale-up or scale-down operations. Although a crucial point, it is often subject to misunderstanding and incorrect handling/selection of impeller type and baffle etc. Under certain special conditions (laminar regime but low viscosity due to small tank) where viscous forces dominate, isolated mixing regions resembling Taylor vortices or Quet-type flows form in the gap between blade the wing and the wall [1]. This causes overall circulated flow is significantly implemented. Using MAXBLEND, the flow patterns occurring in low Reynolds number regime (Quette flow pattern, Taylor vortex pattern, spiral pattern, spiral plus separation pattern, etc.) have been organised and systematised based on Reynolds number and Taylor number. In particular, the conditions for the occurrence of poor mixing regions were clarified, along with the behaviour in the transition zone where good and poor mixing states coexist. It was demonstrated that flow patterns can be controlled.