Abstract:

The turbulent flow of plastic fluids in smooth pipes has been studied by using the stochastic theory of turbulent flow, and the formulas have been presented for evaluating the time average velocity in the whole section of pipes，mean velocity and friction factor, The results obtained from the study have shown that the influence of the yield stress of plastic fluids on turbulent flow is determined by ，The influence will be soon reduced as Re(z) increases or the diameter of pipe red aces. The influence of the yield stress on the dimensionless velocity profile is very small.