| Abstract: | Calculated and experimental data on turbulent transition in a circular pipe are analyzed. The calculations were performed using the three-parameter turbulence model. The dependence of the distance from the inlet to the point of minimum friction during transition on the Reynolds number for fixed inlet conditions and the distribution of the turbulence parameters over the pipe length and radius are obtained. The dependence of the maximum (critical) Reynolds number, Re*, for which there is no transition in the pipe, on the inlet intensity and scale of turbulence is found. It is suggested that Re* depends on the inlet perturbation parameters up to Re* = 1000, where the friction coefficients for laminar and turbulent flows coincide. |
