Accession Number : ADA500729


Title :   Evaluation of a Proposed Drift Reduction Technology High-Speed Wind Tunnel Testing Protocol


Descriptive Note : Journal article


Corporate Author : SOUTHERN PLAINS AGRICULTURAL RESEARCH CENTER COLLEGE STATION TX


Personal Author(s) : Hoffmann, W C ; Fritz, Bradley K ; Lan, Y


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a500729.pdf


Report Date : Mar 2009


Pagination or Media Count : 11


Abstract : The U.S. Environmental Protection Agency EPA has initiated the development of protocols for measuring spray drift reduction technologies (DRTs) related to the application of agricultural protection chemicals. The DRT Program is an EPA-led initiative program to achieve improved environmental and human health protection through drift reduction by accelerating the acceptance and use of improved and cost-effective application technologies. The first step in implementing the DRT program is to develop a set of protocols, standard operating procedures, and data quality assurance steps so that the results from any trials or research conducted are scientifically valid and repeatable. A protocol for measuring spray droplet spectra via laser diffraction equipment in a high speed wind tunnel (air velocities 160 kph (100 mph)) was tested. Following the proposed protocol, five reference nozzles were evaluated with spray solutions of deionized water, water + 9 % isopropanol, and water + 0.25 % of a nonionic surfactant. Each of the nozzle and spray solution combinations were evaluated in 160, 193, and 225 kph (100, 120, and 140 mph) airstreams, as well as under static (0 kph) conditions. The results of these atomization studies showed that there were significant differences in droplet spectra between the spray solutions and from the different air velocities. Based on the time to complete the tests, the author suggest using a +/- 5 % standard deviation values as criteria for accepting atomization tests results.


Descriptors :   *DRIFT , *SPRAYS , *TEST METHODS , CHEMICALS , TEST EQUIPMENT , DROPS , WIND TUNNEL TESTS , AIRSPEED , STANDARDS , AGRICULTURE , ATOMIZATION , SOLUTIONS(MIXTURES) , SPRAY NOZZLES , REPRINTS , SIZES(DIMENSIONS)


Subject Categories : Agricultural Chemistry
      Test Facilities, Equipment and Methods


Distribution Statement : APPROVED FOR PUBLIC RELEASE