Abstract
The aim of this study was to evaluate the spectrum and the velocity of droplets produced by nozzles with and without air induction, under different pressures and flow rates. The experiment was conducted in a completely randomized design with five replications, in a factorial 2 x 3 x 3 (two spray nozzles, three flow rates and three operating pressures). The spray nozzles with and without air induction of the Hypro manufacturer (GA and VP) were evaluated, with nominal flow rates of 0.76; 1.14 and 1.51 L min-1 and pressures of 200, 300 and 400 kPa. The spectrum and velocity of the droplets were determined directly, using a Visisize Portable P15 (Oxford Lasers, Imaging Division). The pressure increases further reduction of the VMD and the relative amplitude, and increases the droplet velocity. The droplets generated by the spray nozzles with air induction showed on average amplitude 1.54 times higher than the droplets generated by spray nozzles without air induction. The droplet velocity showed little variation between the nozzles with and without air induction with the same pressure and flow rate, however, spray nozzles with larger flow rates and pressures produced droplets with higher velocities.
Highlights
The use of air induction nozzles is a commonly used method as a drift reduction strategy in the application of crop protection products
Chechetto et al (2013), in an experiment evaluating the influence of spray nozzles and adjuvants on the potential of wind drift reduction, found that the lowest values of drift percentage were obtained with the nozzles with air induction in all treatments, in co mparison with pre-orifice nozzles
The spectrum and the velocity of droplets generated by different spray nozzles with and without air induction were evaluated under different operating conditions
Summary
The use of air induction nozzles is a commonly used method as a drift reduction strategy in the application of crop protection products. The mechanis m at these nozzles follo ws the operating principle of a Venturi tube These stand out from the other spray nozzle types because the flow rate of liquid and air are mixed inside a chamber, when passing under high pressure by the nozzle and coming into contact with the atmosphere, it forms droplets with air bubbles inside (Mota & Antuniassi, 2013; Leite & Serra, 2013; Silva et al, 2014b). The aim of this study was to evaluate the spectrum and the velocity of droplets produced by nozzles with and without air induction of the same manufacturer submitted to different operating pressures and flow rates
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