Accession Number : AD0771456

Title :   Viscous Drag Reduction in Developing Pipe Flow,

Corporate Author : COLORADO STATE UNIV FORT COLLINS HYDRO MACHINERY LAB

Personal Author(s) : Tullis,J. Paul ; Ramu,Kikkeri L. V.

Report Date : NOV 1973

Pagination or Media Count : 61

Abstract : The characteristics of flow in the entrance region of a rough pipe were studied for water flow and for polymer injection into a boundary layer in a 12-in. diam, 200-ft long steel pipe. The tests without injection provided information on the velocity profile and boundary layer development. A mathematical model was developed for predicting boundary layer thickness, core velocity, and pressure coefficient in the inlet region. Polymer was injected through a perforated wall pipe section located 3.5 pipe diameters from the pipe inlet. Drag reduction, degradation, velocity and concentration profiles were measured. (Modified author abstract)

Descriptors :   *Viscous flow, *Pipes, *Drag reduction, *Polymers, Test methods, Surface roughness, Water flow, Turbulent boundary layer, Injection, Shear stresses, Test facilities, Mathematical models, Velocity, Profiles

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE