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    Characterization of Aerial Spray Nozzles with Laser Light-Scattering and Imaging Probes and Flash Photography

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    Laser light-scattering and imaging probes plus a flash photography system were used to count and measure droplets from a multiple-jet, nozzle-in-boom system with the jets facing downstream in an airflow. Tests were done in a laminar flow wind tunnel. The method of incorporating data from these different measuring systems is explained. The droplet diameter range measured was from 0.5 to 3600 μm. Tests cover air speeds ranging from 11 to 54 m/s, fluid flows from 1.8 to 8.8 L/min per nozzle, for 10-to 30-jet arrays per nozzle with jet inside diameters (ID) from 0.76 to 1.8 mm.

    A correlation obtained for the volume median diameters from 14 tests shows good agreement with experimental data, for the single fluid studied: log10[Dv0.5/d0]=3.71-0.303log10-0.746log10We where d0 is the jet ID, Re is defined for the flow through a single nozzle, and We is based on d0 and the relative velocity of liquid to gas at the nozzle.


    aerial spray nozzle, droplet spectrum measurement, through-valve boom atomizer

    Author Information:

    Picot, JJC
    Professor, University of New BrunswickICI Agrochemicals, FrederictonFernhurst, New BrunswickSurrey

    van Vliet, MW
    Process engineer, Consolidated Bathurst, Inc., Bathurst, New Brunswick

    Payne, NJ
    Research scientist, Forest Pest Management Institute, Canadian Forestry Service, Sault Ste. Marie, Ontario

    Kristmanson, DD
    Professor, University of New Brunswick, Fredericton, New Brunswick

    Committee/Subcommittee: E29.03

    DOI: 10.1520/STP25418S