年間 12 号発行
ISSN 印刷: 1044-5110
ISSN オンライン: 1936-2684
Indexed in
PULSED SPRAYS FROM OVERSIZED ORIFICES FOR INCREASED MOMENTUM AND KINETIC ENERGY IN DEPOSITING AGRICULTURAL SPRAYS
要約
Increasing spray deposition while reducing inadvertent off-target movement is critical with agricultural sprays for field protection of crops. Pulsed flow can increase droplet velocity and energy while maintaining desired droplet size spectra from simple-orifice atomizers. Droplet size spectra and velocities were measured using a phase Doppler laser system for hydraulic atomizing nozzles producing liquid flow of 1.1 liters/min while pressurized at 50–670 kPa. Typical spray cloud volume median diameters ranged from 210 to 337 mm. Droplet velocities in the droplet diameter range of 150 to 400 mm were increased by 3- to 4-fold, corresponding to a 9- to 16-fold increase in kinetic energy of the spray droplets in that size range. The cumulative momentum and kinetic energy of the entire spray cloud were increased by 2-fold and 4.4-fold, respectively. The results confirmed that droplet size spectra could be maintained for adequate target coverage while droplet velocities could be increased to reduce droplet flight times and provide greater kinetic energy for deposition.
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Butts Thomas R., Butts Liberty E., Luck Joe D., Fritz Bradley K., Hoffmann Wesley C., Kruger Greg R., Droplet size and nozzle tip pressure from a pulse-width modulation sprayer, Biosystems Engineering, 178, 2019. Crossref
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Butts Thomas R, Luck Joe D, Fritz Bradley K, Hoffmann W Clint, Kruger Greg R, Evaluation of spray pattern uniformity using three unique analyses as impacted by nozzle, pressure, and pulse‐width modulation duty cycle, Pest Management Science, 75, 7, 2019. Crossref