低粘度液滴撞击液层溅起产生气溶胶
Aerosol generation by the splashing of low viscosity drops impacting liquid layers
AI总结：
研究低粘度液滴撞击液层溅起产生气溶胶，用理论和数值模拟预测撞击后薄液层边缘环形边缘的初始速度和直径，结果与数值及实验吻合，可用于预测雨滴落液池后微小液滴的初始参数及相关现象。
AI中文摘要：
本文利用理论和数值模拟描述了半径为\(R_d\)的低粘度液体（如水）液滴以速度\(V\)撞击厚度为\(H\)的同种液体层的早期阶段。我们对撞击后径向向外喷射的薄液层边缘环形边缘的初始速度\(V_t\gg V\)和直径\(H_t\ll R_d\)的预测，与数值结果以及Zhang等人[《流体力学杂志》，690，5，2012]报道的实验测量结果相当吻合。因此，本研究结果可用于预测雨滴落在液体池后立即喷出的最快微小液滴的初始直径和速度，这一普遍现象对污染物扩散、气溶胶和冰凝结核的产生有影响。
英文摘要：
Using theory and numerical simulations, here we describe the early stages of the impact with a velocity $V$ of a drop of radius $R_d$ of a low viscosity liquid such as water against a layer of generic thickness $H$ of the same liquid. Our predictions for the initial velocity $V_t\gg V$ and the diameter $H_t\ll R_d$ of the toroidal rim bordering the edge of the thin lamella which is ejected radially outwards after the impact, are in fair agreement with both the numerical results and also with the experimental measurements reported by Zhang et al [J. Fluid Mech, 690, 5, 2012]. Consequently, the present findings can be employed, for instance, to predict the initial diameters and velocities of the fastest tiny droplets which are ejected right after a rain drop falls on a liquid pool, an ubiquitous phenomenon with implications in the dispersal of contaminants and in the generation of aerosols and of ice condensation nuclei
