Influence of Aerosol Properties on the Attenuation of Visibility by Artificial Water Fogs.
Technical rept. Jan-Jun 74,
EDGEWOOD ARSENAL ABERDEEN PROVING GROUND MD
Pagination or Media Count:
A theoretical analysis of aerosol properties associated with attenuation of visibility by artificial water fog is presented, utilizing data from the open literature on aerosol diffusion properties as a function of meteorological stability conditions and data generated in house on the evaporation properties of fatty alcohol-stabilized water drops. Operational criteria are established and equations are developed permitting optimization of parameters to potentially attain a specified visibility screening capability. Droplet size distributions and concentration for both homogeneous and heterogeneous fogs are included in the analysis, as are meteorological stability factors, atmospheric relative humidity, fatty alcohol-stabilized water droplet evaporation coefficients, fog generation source strength, screen height, crosswind screening depth, and effective screening distance downwind. Recommendations for continued effort to further disclose the magnitude of the indicated practicable screening potential are made. Author