Turbulence in Drag Reducing Polymer Solutions.

Abstract

Measurements were made of the mean and fluctuating velocity profile with a Laser Doppler Velocimeter in a fully developed turbulent pipe flow of a polymer drag reducing solution. A one-equation turbulence model has been developed by using a damping factor similar to that of Mizushima and Usui. Predictions by the model agree well with experimental data for the mean velocity profile and for the increase of the length scale in polymer solutions. Predictions are also compatible with the streamwise turbulent intensity measurements and show similar trends to the measured intensity distributions in Newtonian fluids and polymer solutions. In highly reduced drag region, predictions, together with the measurements, indicate considerable effect of Reynolds number below Re = 40,000 on the turbulent intensity profile. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Apr 16, 1979
Accession Number
ADA077523

Entities

People

  • I. Kubo

Organizations

  • Pennsylvania State University

Tags

Communities of Interest

  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Channel Flow
  • Computational Fluid Dynamics
  • Drag Reduction
  • Engineering
  • Equations
  • Experimental Data
  • Flow
  • Fluid Dynamics
  • Jet Propulsion
  • Measurement
  • Mechanical Engineering
  • Mechanics
  • Navy
  • Physics Laboratories
  • Pipe Flow
  • Reynolds Number
  • Velocimeters

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.
  • Polymer Science and Technology

Technology Areas

  • Directed Energy