Transformation of the Couette vortex along the length of the tubular structure

Abstract

The article is a further research of a circular-longitudinal flow created in a cylindrical pipe by a continuous swirler called Couette vortex, which the author started to study in his previous works. The key question is how Couette modified vortex is transformed along the channel (pipe). The author regards variation of azimuthal velocities (u) and the Heeger – Baer swirl number (Sn) in turbulent irregular circular-longitudinal flow, which is described by the model of modified Couette vortex along the cylindrical channel. It is confirmed that the model of the modified Couette vortex and free-forced Burgers – Batchelor vortex show almost similar results in calculations and both vortex models can be equally used in engineering prac-tice in calculations and the analysis of circulating and longitudinal flow operating modes (swirl flows).