Avaliação da vazão de pontas de pulverização hidráulica de jato cônico vazio

Abstract

In the search for uniform distribution in the application of plant protection products, the choice and monitoring of spray tips plays an indispensable role in terms of treatment effectiveness and operational efficiency. The aim of this study was to evaluate the flow uniformity and spray distribution profile of three sets of Teejet empty conical jet nozzles with different nominal flow rates. The nozzles have polypropylene bodies and ceramic inserts and were subjected to the spacing, pressure and working speed parameters that are commonly used in daily operations. Measurement was carried out using a digital flow meter, which took unit readings of each tip over a period of 5 seconds. For the TXA8001VK nozzle set, 9 irregular nozzles were found, corresponding to 12% of the spray area; for the TXA8003VK set, 19 irregular nozzles were identified, corresponding to 26% of the spray area; and finally, for the TXA80015 set, 22 irregular nozzles were found, corresponding to 30% of the spray area. The irregular tips were responsible for causing a variation of +1.8%, -5.67% and -3.13% in the application rate, respectively. The TXA8001VK and TXA80015 set of tips had lower standard deviations and coefficients of variation, indicating greater uniformity when compared to the TXA8003VK set, which had a lower standard deviation.