The Orientation Distribution of Nonspherical Aerosol Particles within a Cloud.

Abstract

The orientation distribution of non-spherical particles within a cloud was studied. Theoretically, the subject was treated for a general laminar flow of immediate as well as weak and strong character, and for a turbulent flow whose Kolmogoroff scale was much larger than the particles themselves. The laminar flow served as one realization for the turbulent field within the cloud. It is found that the orientation distribution function in a laminar medium is generally structured with a preferred orientation while that of the turbulent medium is random on the average but with a significant dispersion. Experimentally, a horizontal wind tunnel was erected for orientation measurements; it was equipped with a dedicated hot-wire computerized system for turbulence characterization, which was shown to conform to the determinations of Laufer. Light scattering signals were used as the orientation-gauge.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1985
Accession Number
ADA167326

Entities

People

  • Isaiah Gallily

Organizations

  • Hebrew University of Jerusalem

Tags

Communities of Interest

  • Air Platforms
  • C4I
  • Sensors

DTIC Thesaurus Topics

  • Aspect Ratio
  • Boundary Layer
  • Cartesian Coordinates
  • Colloids
  • Computational Fluid Dynamics
  • Coordinate Systems
  • Differential Equations
  • Diffusion Coefficient
  • Distribution Functions
  • Equations
  • Fluid Dynamics
  • Fluid Flow
  • Laminar Flow
  • Light Scattering
  • Shear Flow
  • Simulations
  • Steady State

Fields of Study

  • Physics

Readers

  • Aerosol Science/Aerosol Physics
  • Fluid Mechanics and Fluid Dynamics.
  • Theoretical Analysis.