Nozzle classification system in Japan based on the relative spray ...

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Drift Potential Index Reduction Percentage, % Drift Potential Index Reduction Percentage, % 3. Results and discussion The DIXRP values of ES nozzle and the correspond<strong>in</strong>g standard errors with different nozzle sizes were shown <strong>in</strong> Fig. 2.and 3. Except ES05 nozzles, the DIXRP values of different nozzle-pressure comb<strong>in</strong>ations experienced a gentle <strong>in</strong>crease as the nozzle sizes <strong>in</strong>creased. The reason why the <strong>in</strong>crease was not obvious could be that compar<strong>in</strong>g with other type of nozzles, this type of nozzle had a relatively steady volume median diameter with different nozzle sizes. Based on the manufacturer data, the average value of the volume median diameter of the ES nozzle was 300 μm. The <strong>in</strong>crease of the flow rate might also lead an <strong>in</strong>crease of the drift reduction performance due to the normalization by divid<strong>in</strong>g the spray output and the stronger resistance force to w<strong>in</strong>d produced by more dense spray. The difference of the droplet sizes and the small flow rate might have contributed to the rapid <strong>in</strong>crease of the DIXRP values from ES05 to ES06. 120.00 100.00 80.00 60.00 40.00 20.00 0.00 -20.00 1.0MPa 1.5MPa ES05-1.00 ES07-1.00 ES09-1.00 ES11-1.00 ES06-1.50 ES08-1.50 ES10-1.50 ES06-1.00 ES08-1.00 ES10-1.00 ES05-1.50 ES07-1.50 ES09-1.50 ES11-1.50 FIGURE 2: DIXRP values obta<strong>in</strong>ed under different nozzle-pressure comb<strong>in</strong>ations of ES series nozzle with the nozzle height of 0.3m 150.00 100.00 50.00 0.00 -50.00 -100.00 1.0MPa 1.5MPa ES05-1.00 ES07-1.00 ES09-1.00 ES11-1.00 ES06-1.50 ES08-1.50 ES10-1.50 ES06-1.00 ES08-1.00 ES10-1.00 ES05-1.50 ES07-1.50 ES09-1.50 ES11-1.50 FIGURE 3: DIXRP values obta<strong>in</strong>ed under different nozzle-pressure comb<strong>in</strong>ations of ES series nozzle with the nozzle height of 0.4m Fig. 4 and 5 shows the <strong>in</strong>fluence of the nozzle pressure on the DIXRP values. Expect ES05, the DIXRP values obta<strong>in</strong>ed under two nozzle pressures had just a little fluctuation to each nozzle size and no trend was found. The ma<strong>in</strong> reasons might be that the <strong>in</strong>fluence of the decrease of the droplet size on the DIXRP values was offset by the <strong>in</strong>crease of the flow rate and the droplet velocity when the nozzle pressure <strong>in</strong>creased.
Drift Potential Index Reduction Percentage, % Drift Potential Index Reduction Percentage, % Drift Potential Index Reduction Percentage, % 120.00 ES05-1.00 ES05-1.50 100.00 ES06-1.00 ES06-1.50 80.00 ES07-1.00 ES07-1.50 60.00 ES08-1.00 ES08-1.50 40.00 ES09-1.00 ES09-1.50 20.00 ES10-1.00 ES10-1.50 0.00 ES11-1.00 ES11-1.50 -20.00 05 06 07 08 09 10 11 FIGURE 4: DIXRP values obta<strong>in</strong>ed under different nozzle-pressure comb<strong>in</strong>ations of ES series nozzle with the nozzle height of 0.3m 150.00 100.00 ES05-1.00 ES06-1.00 ES05-1.50 ES06-1.50 50.00 ES07-1.00 ES07-1.50 0.00 ES08-1.00 ES09-1.00 ES08-1.50 ES09-1.50 -50.00 ES10-1.00 ES10-1.50 -100.00 05 06 07 08 09 10 11 ES11-1.00 ES11-1.50 FIGURE 5: DIXRP values obta<strong>in</strong>ed under different nozzle-pressure comb<strong>in</strong>ations of ES series nozzle with the nozzle height of 0.4m The <strong>in</strong>fluence of the nozzle height on the DIXRP values under different nozzle heights were illustrated <strong>in</strong> Fig. 6 and 7. The nozzle height was <strong>in</strong>versely proportional to the DIXRP although the change of the nozzle height was just 0.1m. Compar<strong>in</strong>g with the <strong>in</strong>fluence of the nozzle size and pressure on the DIXRP values, the nozzle height might be the most important factor that <strong>in</strong>fluences the drift reduction ability. 120.00 100.00 80.00 60.00 40.00 20.00 ES05-0.3 ES06-0.3 ES07-0.3 ES08-0.3 ES09-0.3 ES10-0.3 ES11-0.3 ES05-0.4 ES06-0.4 ES07-0.4 ES08-0.4 ES09-0.4 ES10-0.4 ES11-0.4 0.00 05 06 07 08 09 10 11 FIGURE 6: DIXRP values obta<strong>in</strong>ed under different nozzle-pressure comb<strong>in</strong>ations of ES series nozzle with the nozzle pressure of 1.0MPa
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