|Bayat, A - OSU/OARDC|
|Ozkan, H - OSU|
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: May 26, 1999
Publication Date: N/A
Technical Abstract: Variables affecting spray drift include weather, chemical formulation, droplet size and machine operating parameters. In nearly all situations, the most important factor influencing drift is droplet size. The amount of particle drift depends mainly on the number of small, driftable particles produced by the nozzle. Although excellent coverage can be achieved with extremely small droplets, these are most likely to drift off-target. The objective of this study was to measure droplet sizes produced by a standard flat fan nozzle (XR) and two new drift reduction nozzles: Spraying Systems Turbo TeeJet (TT) and air induction (AI) nozzles. Droplet size data were also used to determine the percent of spray volume of drift prone droplets (<50 um, <100 um, <150 um, <200 um in diameter). Three nozzle sizes (110015, 11003 and 11005) of each nozzle type were tested at three pressures (2.7, 4.1 and 5.5 bar). In addition, air intake holes on the venturi type of nozzle (AI) were closed to determine the effect of this condition. The results showed that both, new, drift reduction nozzle designs produced higher Dv.5 and fewer drift prone droplets than the standard flat fan nozzle (XR) when operated at similar pressure and flow rate. The TT and AI nozzles decreased the percent spray volume in drift prone droplets compared to the XR nozzles. AI nozzles were more effective than TT nozzles of the same size. Plugging the air intake holes on the venturi section of AI nozzles produced slightly smaller droplet sizes, increased flow rate and the percent of spray volume in drift prone droplets.