Mixing in chemical technology is used to intensify chemical and heat-mass transfer processes, as well as for preparing emulsions, suspensions and obtaining homogeneous systems. The simplest way to carry out the process, which does not require an additional supply of mechanical energy, is to mix in a direct-flow environment, which only requires flow energy. Analysis of the existing designs of direct-flow mixers showed that the use of swirling devices of various types in order to increase the efficiency of the process is very promising. This article describes a study of the influence of the geometrical dimensions of the screw on the efficiency of mixing a two-component mixture using the FlowVision software package.