1995, Zeszyt 99
Friction factor for accelerated turbulent flow through long smooth pipes
ZBIGNIEW ZARZYCKI
Abstract
The paper presents a mathematical model of unsteady turbulent pipe flow developed using the four-layer distribution of the coefficient of turbulent viscosity. This model is used for determining the hydraulic losses. A detailed discussion deals with the instantaneous friction factor for accelerated liquid flow. This coefficient increases with increasing acceleration of liquid flow and decreases with increasing Reynolds number. It is demonstrated that the instantaneous friction factor considerably differs from the quasi-steady value.
Keywords:
turbulent flow, smooth pipesDownload: