Measurements of Molecular Stretching in Irrotational Flow by Light Scattering.

Abstract

Extreme stretching of polymer molecules has been postualted as the basic drag-reducing mechanism in turbulent flows of dilute polymer solutions. The stretching is predicted to occur in significant portions of the turbulent flow where the strain rate field is sufficiently rotation-free and above the threshold for the particular polymer additive. To provide support for these predictions, the explicit purpose of this investigation was to determine experimentally the streamwise extensions of poly(ethylene oxide) molecules in such an isolated strain rate field.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1976
Accession Number
ADA039061

Entities

People

  • Gary Lee Dennison

Organizations

  • Pennsylvania State University

Tags

Communities of Interest

  • Energy and Power Technologies
  • Ground and Sea Platforms
  • Space

DTIC Thesaurus Topics

  • Boundary Layer
  • Computational Fluid Dynamics
  • Drag
  • Engineering
  • Equations
  • Flow Fields
  • Fluid Dynamics
  • Fluid Flow
  • Fluid Mechanics
  • Light Scattering
  • Mechanics
  • Mixing
  • Particle Size
  • Polymers
  • Reynolds Number
  • Steady Flow
  • Turbulent Flow

Readers

  • Fluid Mechanics and Fluid Dynamics.
  • Optical Physics and Photonics.
  • Polymer Science and Engineering.