A Study of Pollutant Dispersal in a Two Dimensional Field Including Gravity Effects.

Abstract

The effect of gravity forces on turbulent development is investigated both experimentally and numerically. In the experimental investigation, helium gas is released into an air stream. The experiment is carried out in a low speed, low turbulence wind tunnel. The He is released through an area source. Two configurations are investigated: He released from the top of the section and He released from the bottom of the section. Three different free stream turbulence levels are investigated at two free stream velocities. Numerically, the conservation of mass equation, written for a system of two species, is solved. The turbulent diffusion terms are modelled with a gradient flux model, constant coefficient of diffusivity. Comparisons are made with the experimental data, comparing effects of changing turbulent intensity, free stream velocity and buoyancy.(Author)

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Document Details

Document Type
Technical Report
Publication Date
Jun 28, 1984
Accession Number
ADA144295

Entities

People

  • Steven Brown

Organizations

  • von Kármán Institute for Fluid Dynamics

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acquisition
  • Boundary Layer
  • Buoyancy
  • Coefficients
  • Coordinate Systems
  • Data Acquisition
  • Diffusion
  • Diffusivity
  • Fluid Dynamics
  • Hot Wire
  • Layers
  • Measurement
  • Test Facilities
  • Turbulence
  • Turbulent Diffusion
  • Turbulent Mixing
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Aerosol Science/Aerosol Physics
  • Oceanography.
  • Structural Dynamics.