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Description: Particle size is a critical factor in deter mining the behaviour of pesticide sprays in the atmosphere. The size of a spray droplet affects its terminal velocity, its rate of evaporation and whether it will deposit in the target area or drift out of it (1). Particle size also determines whether a given drop will deposit on the upper layers of the plant canopy or flow around the leaves, penetrate the crop, and impact upon insects within it (4). All spraying machines now commercially available produce a wide spectrum of droplet sizes. This is largely due to the methods of atomization used (3) and is the source of a number of problems. To prevent the drift of herbicides, for example, the spray should not contain any droplets smaller than 200 microns in diameter. However, for insect control, in situations where drift is not a problem, it might be preferable if most of the spray were in much smaller drops. Himel (5, 6, 7) showed that only drops of 50 microns or less, constituting 1%of the spray volume, actually impacted on the Spruce Budworm larvae which were the target. This suggests that if all the spray had been in drops of 50 microns or less the amount of insecticide released into the environment could have been reduced one hundredfold.

Keywords: a shrouded spinning disc for the production of homogeneous sprays
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Citation: McKinlay, K.S. and G.S. Glen 1971. A SHROUDED SPINNING DISC FOR THE PRODUCTION OF HOMOGENEOUS SPRAYS. Canadian Agricultural Engineering 13(1):19-22.
Volume: 13
Issue: 1
Pages 19 - 22
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Date: 1971
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Coverage: Canada
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