Generation of deterministic eddy structure of the flow as an analogue of the phase transition of the second kind. Development of ideas of academician I.I. Novikov

Abstract

The analysis of the physical processes leading to the structure formation of fluids has been done. The proposed theoretical approach can be used both for the neutral, conductive and magnetic fluids. In the present work the main attention is paid to the vortex and swirl flows of Newtonian fluids. Critical conditions accompanied the occurrence of hydrodynamic instabilities with a structural restructuring of flow field have been identified due to carried out physical experiments on generation of large-scale steady-stable vortex structures in channels of complicated geometry. Examples of topological models of the internal structure of the flow under condition of the phase transition of the second kind without changing of the aggregation state of the environment have been considered. It is shown that for vortex and swirl flows the parameter of helicity associated with the emergence of the internal angular momentum of the fluid and the structuring of the flow depending on the intensity of the local vorticity and orientation of longitudinal helical vortices can be accepted as the order parameter.