Cluster Formation in Free-Jet Expansions

Abstract

An aerodynamic molecular beam has been used in an attempt to develop criteria for the determination of the onset of condensation in free-jet expansions of various gases. Measurements have been made of the total, monomer, dimer, trimer, etc., beam intensity and velocity distribution as a function of source pressure for the following conditions: (1) sonic orifice diameters of 0. 0147, 0.0386, and 0.1245 cm, (2) 15-deg semiangle conical nozzle with a 0.111- cm-diam throat, (3) source temperatures from 185 to 430K, (4) source pressures ranging from 5 to 10,000 torr, (5) argon, nitrogen, nitric oxide, sulphur dioxide, carbon dioxide, and krypton, and (6) 22K skimmer and collimator surfaces.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1972
Accession Number
AD0740898

Entities

People

  • A. B. Bailey
  • M. R. Busby
  • R. Dawbarn

Organizations

  • Arnold Engineering Development Complex

Tags

Communities of Interest

  • Advanced Electronics
  • Materials and Manufacturing Processes
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Amplifiers
  • Carbon Dioxide
  • Collimators
  • Conical Nozzles
  • Detectors
  • Electron Energy
  • Field Effect Transistors
  • Gas Flow
  • Mach Number
  • Mass Spectrometers
  • Measurement
  • Molecular Beams
  • Nozzles
  • Pressure Measurement
  • Test And Evaluation
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Combustion and Flow Dynamics.
  • Molecular Photonics/Laser Physics