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The spraying of a pesticide through a traditional hydraulic nozzle produces a heterogeneously sized droplet cloud. Three of the factors determining the fate of the droplets subsequent to their formation are: (1) the mechanics of the atomization process itself, (2) the forward motion of the nozzle and droplet cloud, and (3) any ambient wind. The Particle Measuring Systems Inc. (PMS) Imaging Spectrometer has been used to characterize the droplet cloud; and this data is related to the behaviour observed during motion, when twin inwardly curling vortices are formed behind the nozzle. These vortices become susceptible to drifting away from the target. An attempt has been made to characterize the vulnerability of a particular nozzle to produce a driftable component by assessing a factor termed the Drift Potential. Data are presented for a range of nozzles.
hydraulic nozzle, droplet dynamics, PMS Spectrometer, drift potential, nozzle movement, vortices
Technical Officer, Spray Application Unit, ICI Agrochemicals, Jealott's Hill Research Station, BRACKNELL, Berkshire