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CHANDRA, SURESH (2011)
Publisher: Co-Action Publishing
Journal: Tellus A
Languages: English
Types: Article
Subjects:
Diffusion of helium gas from an instantaneous point source within a neutral boundary layer has been studied. Concentrations from a simulated point source, located at a fixed height of 8 inches above a smooth surface, were measured for several downstream cross-sections of the diffusing cloud. Separation of the total dispersion into two components, spreading and meandering, is obtained on the basis of Gifford's fluctuating model. The results of this analysis are used to determine the Hay-Pasquill scale parameter which relates the Lagrangian and Eulerian scales of turbulence. Meandering is shown to have a significant effect on the scale parameter.DOI: 10.1111/j.2153-3490.1972.tb01549.x
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    • Baldwin, L. V. & Mickelsen, W. R. 1962. Turbulent diffusion and anemometer measurements. Journal of Engineering Mechanics 8 8 , 37-69.
    • Chandra, S., August 1967. Diffusion from an instantaneous point source into a turbulent boundary layer. Ph. D. dissertation, Colorado State University, Fort Collins, Colorado. 141 pp.
    • Frenkiel, F. N. 1949. Proc. U.S. Naval Ordnance Laboratory Research Symposium, White Oak, Maryland.
    • Gifford, F. 1959. Statistical properties of a fluctuating plume dispersion model. Advances i n Geophysics 6 , 117-137. Academic Press.
    • Haugen, D. A. 1966. Some Lagrangian properties of turbulence deduced from atmospheric diffusion experiments. Journal of Applied Meteorology 5 , 646-652.
    • Hay, J . S. & Pasquill, F. 1959. Diffusion from a continuous source in relation t o the spectrum and scale of turbulence. Advances in Geophysics 6 , 345-365.
    • Mickelsen, W. R. 19.55. An ezperimental comparison of the Langrangian and Eulerian correlation coefficients in homogeneous isotropic turbulence.National Advisory Committee for Aeronautics, TN 3570, Washington.
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