Similarity Laws for Turbulent Flow of Dilute Solutions of Drag-Reducing Polymers,

Abstract

Velocity similarity laws, based on a four-layer, mean-velocity-profile model are deduced for turbulent boundary layers with dilute polymer solutions by means of pipe-flow experiments. Measured drag reduction is studied in three domains: undersaturated, optimal, and oversaturated. Drag reduction increases with increasing concentration in the undersaturated domain where the four-layer profile exists in the boundary layer. The boundary between the two domains gives optimal drag reduction; it is determined by the polymer type and concentration and by a Reynolds number based on shear velocity and boundary-layer thickness. The effects of solvent temperature, pipe diameter, polymer type and concentration, and wall shear stress on the measured drag reduction have been investigated. (Modified author abstract)

Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1973
Accession Number
AD0766787

Entities

People

  • T. T. Huang

Tags

DTIC Thesaurus Topics

  • Boundaries
  • Boundary Layer
  • Drag
  • Drag Reduction
  • Flow
  • Layers
  • Pipe Flow
  • Reynolds Number
  • Shear Stresses
  • Turbulent Boundary Layer
  • Turbulent Flow

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Fluid Dynamics.