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    STP1610

    Nonlinear Derivation of Spread Factor Due to Viscous Energy Losses

    Published: 2018


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    Abstract

    Water-sensitive paper (WSP) provides a quick and easy method for evaluating the coverage and deposition from spray applications. The most common metric recorded is the percentage coverage as measured by droplet size, which is highly influenced by the stain diameter resulting from the droplet deposition and spread on the paper. Complicating this process is the fact that the stain diameter, and thus the spread factor, is affected by the physical properties of the spray solution, meaning different spray solutions require unique spread-factor relations to accurately estimate the droplet size and deposition on WSP. Because past techniques for determining a spread factor have been cumbersome and time-consuming, a more empirical process was developed using the physical properties of the spray and an energy balance equation. The specific objective of this work was to develop a formula for calculating the spread factor on WSP based on the physical properties of the spray.

    Keywords:

    spray application, spread factor, water-sensitive paper


    Author Information:

    Wilde, Scott C.
    U.S. Dept. of Agriculture, Agriculture Research Services, Aerial Application Technology Research Unit, College Station, TX

    Hoffmann, W. Clint
    U.S. Dept. of Agriculture, Agriculture Research Services, Aerial Application Technology Research Unit, College Station, TX

    Fritz, Bradley K.
    U.S. Dept. of Agriculture, Agriculture Research Services, Aerial Application Technology Research Unit, College Station, TX


    Committee/Subcommittee: E35.22

    DOI: 10.1520/STP161020170241