DROP IMPACT EXPERIMENT AS A MODEL EXPERIMENT TO INVESTIGATE THE ROLE OF OIL-IN-WATER EMULSIONS IN CONTROLLING THE DROP SIZE DISTRIBUTION OF AN AGRICULTURAL SPRAY

• DOI: 10.1615/atomizspr.2015013630
• Publication Date: 2015-09-28T20:16:50Z
• Authors: Clara Vernay; Laurence Ramos; Jean-Paul Douzals; Rajesh Goyal; Jean-Christophe C...; Christian Ligoure
• Keywords: Drop Impact; Spray characteristics; Break-Up

Agricultural spraying involves atomizing a liquid stream through hydraulic nozzle, thus forming sheet that is subsequently destabilized into drops. Standard adjuvants such as dilute oil-in-water emulsions are known to influence the spray drop size distribution. Although being documented, physical mechanisms at origin of increase remain unclear. To elucidate causing changes on distribution, we investigate destabilization sheets. Model laboratory experiments based collision tear small solid target used produce and characterize With emulsions, during its expansion by nucleation holes perforate grow. The emulsion concentration oil droplet varied rationalize their mechanisms. results obtained with model compared measurement distribution resulting from conventional agricultural spray. very good correlation between number perforation events volume fraction drops in suggests (i) experiment appropriate gain an understanding governing (ii) mechanism sheets, which dominates for