Abstract The numerical simulation of water spray ejected from HARDI™ ISO F110 03 flat fan nozzle has been performed in this work. The simulation models of ejection and trajectory of liquid droplets proposed in previous study are used for obtained the diameters distribution and velocity of liquid particles and the collision drops phenomena into the spraying fat fan. The aim of this work is take into account both, the collision drops by changing the surface tension and evaporation phenomena using a binary collision and evaporation models. To validate the evaporation model, numerical simulation of water droplet ejection at 293 Kelvin degree were performed and their results has been compared with experimental data published. A total of 9 simulations, varying the meteorological conditions and recording 40 drops of diameters approximate to 100 μm and 200 μm has been performed. For the binary droplet collision, the surface tension of water at 278 Kelvin and 293 Kelvin was considered in order to vary its surface tension. Also, water at 293 Kelvin with different surface tension was considered in order to represent mixtures with surfactants. Collision boxes were implemented in order to determinate the impact coefficient. Four outcomes were identified: (a) coalescence, (b) reflexive separation, (c) stretching separation, (d) bounce. The generation of satellite droplets in the reflexive separation and stretching processes increases the drift risk when the product is applied. The alternative that show a better option to minimize the drift risk is water at 278 Kelvin. Additionally, it was determined that considering the processes of evaporation and collision of droplets, ejecting droplets with an average diameter of 350 μm, by obtaining a good fit (coefficient of determination R 2 > 0.96 ) between the droplet distribution curve and the volume of experimental measurement.

中文翻译：

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喷洒除草剂喷嘴的数值模拟：蒸发和二元碰撞模型

摘要 本文对HARDI™ ISO F110 03扁平扇形喷嘴喷水进行了数值模拟。利用前人研究中提出的液滴喷射和轨迹模拟模型，获得了液体颗粒的直径分布和速度，以及喷射脂肪扇中的碰撞液滴现象。这项工作的目的是考虑到两者，使用二元碰撞和蒸发模型通过改变表面张力和蒸发现象来降低碰撞。为了验证蒸发模型，对 293 开尔文度的水滴喷射进行了数值模拟，并将其结果与已发表的实验数据进行了比较。共9次模拟，改变气象条件并记录了 40 滴直径约为 100 μm 和 200 μm 的液滴。对于二元液滴碰撞，考虑了 278 开尔文和 293 开尔文水的表面张力以改变其表面张力。此外，还考虑了具有不同表面张力的 293 开尔文水，以代表与表面活性剂的混合物。碰撞盒的实施是为了确定冲击系数。确定了四个结果：（a）聚结，（b）反射分离，（c）拉伸分离，（d）反弹。在反射分离和拉伸过程中产生的卫星液滴增加了产品应用时的漂移风险。显示降低漂移风险的更好选择的替代方案是 278 开尔文的水。此外，