REFINED METHOD FOR DETERMINING THE VALUES OF HYDRODYNAMIC CHARACTERISTICS OF NEAR-WALL SUBLAYER OF A TURBULENT FLOW
The results of theoretical studies of the patterns of changes in the hydrodynamic characteristics of the near-wall sublayer of axisymmetric turbulent fluid flow at the critical point of transition into the region of the quadratic law of resistance are presented. It is shown that under the logarithmic law of distribution of averaged local flow velocities иr over the current radius r of the axisymmetric turbulent fluid flow, the distance from the pipe wall to the layer where иr will be equal to the average velocity ? has the value yср = 0.223r. A system of theoretical equations is obtained that allows to determine hydrodynamic characteristics of wall sublayer in quadratic region of the resistance of turbulent fluid flow depending on the relative hydraulic smoothness of pipe walls and the Nikuradze criterion N. The obtained equations can be used in calculation and design of hydrodynamic devices working in the field of developed turbulence.