水资源保护2026，Vol.42Issue(2)：250-258,9.DOI:10.3880/j.issn.1004-6933.2026.02.027
液滴冲击作用下的微塑料颗粒飞溅机制
Splashing mechanism of microplastic particles under drop impact
摘要
Abstract
To reveal the potential mechanism of rainfall on the diffusion of microplastic pollution,a drop impact experiment was conducted on the microplastic particle layer.High-speed photography was used to capture the flow regime after drop impact on the microplastic particle layer,and a flow zone map was established to determine the threshold between each flow regime.The influence of characteristic parameters on the flow regime after drop impact was also analyzed.The results indicate that the flow regime of drops after impacting the layer of microplastic particles includes bouncing,spreading,coronal splashing,and prompt splashing.Increasing the Reynolds number Re0,Weber number We0,relative size D* of microplastic particles,or relative thickness h* of particle layers can promote the transition of the flow regime from bouncing to spreading and then to coronal splashing or prompt splashing.A dimensionless number M=D*h*We0Re-2/50 is proposed based on Buckingham π theorem for identifying the threshold between different flow regimes.The mechanism of drop impact on the splashing of microplastic particles includes forward collision and viscous carrying.The former exists in all flow states,while the latter exists in bouncing,coronal,and prompt splashing flow states.Compared with viscous carrying,forward collision driving is more likely to cause large-scale propagation of microplastic particles.关键词
降雨/微塑料污染/液滴冲击/飞溅机制/流态/高速摄影Key words
rainfall/microplastic pollution/drop impact/splashing mechanism/flow regime/high-speed photography引用本文复制引用
钱尚拓,胡可,叶涵,苑敏,曾琴,董姝楠,冯建刚,徐辉..液滴冲击作用下的微塑料颗粒飞溅机制[J].水资源保护,2026,42(2):250-258,9.基金项目
国家自然科学基金项目(52279063) （52279063）
江苏省自然科学基金项目(BK20231462) （BK20231462）
中央高校基本科研业务费专项资金项目(B240201055) （B240201055）
