Abstract
A review of vortex apparatuses and processes in which a rotating gas-liquid flow is used as an intensification of heat and mass transfer is presented.
 It is shown that tangential swirlers, which are easy to manufacture and compact, have found the greatest application in industrial practice for creating gas (steam) rotation.
 It is experimentally established that tangential swirlers with annular walls of channels intended for gas passage have the lowest hydraulic resistance.
 The data on the hydraulic resistance of tangential swirlers with annular channels, velocity and pressure obtained experimentally and by calculation in a wide range of variation of the design parameters of the device are presented.
 The dependences between the hydraulic resistance of the swirler and its design parameters are revealed.
 Numerical simulation of the parameters of the gas flow in the channels is carried out. Diagrams of the pressure and velocity distribution are presented and analyzed, and experimental data on the influence of the design parameters of the swirler channel, such as width and length, on its hydraulic resistance are confirmed.
 An empirical dependence for determining the hydraulic resistance coefficient of a tangential swirler with annular channels is presented for engineering calculations.
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