Prediction of Molecular Scattering Effects in Free-Jet Expansions

Abstract

The effects of background pressure on reduction of molecular beam intensity are investigated. A theoretical model is developed which shows the background to be separable into two distinct components: one attributable to reflected jet particles and the other attributable to residual (unpumped) particles. An expression for the Fenn and Anderson correlation parameter is obtained. Comparisons of the data of several investigators are made with theoretically predicted values of intensity as a function of either separation distance or source pressure. The characteristic dip in the intensity versus source pressure curve has been related to scattering effects as well as to condensation effects.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1971
Accession Number
AD0717158

Entities

People

  • J. A. Benek

Organizations

  • Arnold Engineering Development Complex

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Collisions
  • Condensation
  • Detectors
  • Equations
  • Flow
  • Frequency
  • Geometry
  • Intensity
  • Measurement
  • Molecular Beams
  • Particle Collisions
  • Particles
  • Pressure Measurement
  • Residuals
  • Scattering
  • Test And Evaluation

Fields of Study

  • Physics

Readers

  • Aerosol Science/Aerosol Physics
  • Combustion and Flow Dynamics.
  • Regression Analysis.