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Pesticide Spray Droplet Adhesion Modeling

机译:农药喷雾液滴附着力建模

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摘要

Spray droplet adhesion is a consequence of dynamic interactions of formulants within the spray droplet during flight and on impact, physical properties of the droplet (size and velocity), leaf surface morphology and leaf orientation. The objective of this study was to improve on a universal adhesion model incorporating the above factors. The previous spray droplet adhesion model has been extended to include droplet size (ranging from 180 μm to 1000 μm) and droplet velocity (0.63 ms~(-1) to 2.82 ms~(-1) at impact), and made more robust by increasing the number of formulations (dynamic surface tension of droplets at impact range from 20.7 to 72 mN m~(-1)), the types of leaf surfaces (20% acetone contact angles on the leaf surfaces range from 61° to 124°), and the number of droplet impact angles (leaf angles from horizontal to 67.5°). In this study, contact angles using 20% acetone:water accounted for 95% of the differences between the leaf surfaces studied compared to 76% previously observed with water only. The present universal model explains 74% of the deviance. The current model's capabilities and limitations are discussed in relation to the physical parameters measured and observed.
机译:喷雾液滴的附着是在飞行过程中以及在撞击过程中,喷雾液滴内的配方之间发生动态相互作用的结果,液滴的物理性质(大小和速度),叶片表面形态和叶片方向均受到影响。这项研究的目的是改善纳入上述因素的通用粘附模型。先前的喷雾液滴粘附模型已扩展到包括液滴大小(范围从180μm到1000μm)和液滴速度(撞击时0.63 ms〜(-1)到2.82 ms〜(-1)),并且通过增加制剂的数量(冲击时液滴的动态表面张力从20.7到72 mN m〜(-1)),叶片表面的类型(叶片上20%的丙酮接触角范围从61°到124°) ,以及液滴碰撞角度(从水平到67.5°的叶片角度)的数量。在这项研究中,使用20%丙酮:水的接触角占所研究叶片表面差异的95%,而之前仅用水观察到的接触角为76%。目前的通用模型可以解释74%的偏差。讨论了当前模型的功能和局限性,并与所测量和观察到的物理参数有关。

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