A mixer with coaxial arrangement of inner and outer circular cylinders with smooth surfaces is considered. During the mixer operation, a circulating flow is formed between the cylinders with the same conditions of motion along the entire length of the annular gap. The smooth surfaces of the inner and outer vertical cylinders reduce the possibility of the polymer solution destruction as an agent for reducing hydraulic resistance due to the high speed of rotation of the inner cylinder and/or the outer cylinder. The hydrodynamics of the mixing process of an aqueous solution of polyacrylamide (PAA) with a mass concentration of 100 ppm in the gap between the cylinders, the inner one of which was rotating, were estimated by the dependence of the power criterion NP on the modified Reynolds criterion Rem. The mixing of the aqueous solution of PAA occurred in a laminar mode with a decrease in NP at a certain fixed value of Rem compared to water.
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