Abstract
ABSTRACT SPRINKLERS with circular and noncircular, low-pressure, nozzles were tested in order to determine droplet diameters and water application uniformity. Volume weighted mean droplet diameter was greater for noncircular nozzles at a given distance from the sprinkler, but the maximum droplet diameter was greater for circular nozzles near the perimeter of the wetted pattern. This was possible because wetted diameter was greater for circular nozzles. Although droplet size is inversely related to jet velocity for circular and noncircular nozzles, the relations are not identical and the mechanism of droplet formation from noncircular nozzles should be further investigated. The soil damage hazard from large droplets is further compounded in the case of circular nozzles at low pressures due to high application rates near the perimeter. Added equipment cost, associated with retrofitting existing medium or high pressure sprinkler systems, should be offset by energy savings. Equipment cost is greater because sprinkler spacing generally decreases when low-pressure sprinklers are used.
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