Argon Condensation in Free-Jet Expansions

Abstract

Homogeneous condensation of argon was observed using sonic orifice expansion flow fields. The room temperature argon was studied over the range of reservoir pressures from 200 to 750 torr using a 3.2-mm orifice diameter. Condensation onset and the subsequent cluster growth was observed using laser Rayleigh scattering, and maximum supersaturation ratios as a function of reservoir pressures were determined. Depolarization ratio measurements were performed for the 750-torr expansion, and shape changes of the cluster were observed throughout the growth region. Comparisons of these results and previous mass spectrometric data are made, and specifically the mass fraction of argon condensate and cluster sizes are estimated.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1974
Accession Number
AD0782445

Entities

People

  • J. W.L. Lewis
  • W. D. Williams

Organizations

  • Arnold Engineering Development Complex

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Air Force
  • Coherent Radiation
  • Condensation
  • Depolarization
  • Diameters
  • Diffraction
  • Distribution Functions
  • Engineering
  • Laser Beams
  • Measurement
  • Payload
  • Radiation
  • Rayleigh Scattering
  • Saturation
  • Scattering
  • Supersaturation
  • Waveplates

Fields of Study

  • Physics

Readers

  • Combustion and Flow Dynamics.
  • Spectroscopy.

Technology Areas

  • Directed Energy
  • Directed Energy - Lasers
  • Directed Energy - Pulsed-Laser Deposition