Characteristics of secondary droplets produced by the impact of drops onto a smooth surface

Advances in Aerodynamics

Haixiang Zhang¹  Feng He¹  Ye Gao¹  Xiwen Zhang¹  Pengfei Hao¹  Xian Yi²  Yanxia Du²  Zheyan Jin³ 

[1] Applied Mechanics Laboratory, Department of Engineering Mechanics, Tsinghua University, 100084, Beijing, China;Key Laboratory of Icing and Anti/De-Icing of Aerocraft, China Aerodynamics Research and Development Center, 621000, Mianyang, Sichuan, China;School of Aerospace Engineering and Applied Mechanics, Tongji University, 200092, Shanghai, China;

关键词: Splashing;    Droplet;    Impact;    Secondary droplets;   

DOI  :  10.1186/s42774-021-00091-w

来源: Springer

【 摘 要 】

This work investigates the splashing behaviors of droplets impacting on solid surfaces and mainly focuses on the characteristics of secondary droplets. According to the experimental results, two different splashing patterns, corona splash and levitating-lamella breakup, are observed. A new breakup mode, named rim-segmenting, is found during the levitating-lamella breakup. In particular, the detailed information of the splashing secondary droplets, including the size, velocity, angle, and total volume of the splashing secondary droplets is obtained from the experimental data. The size distribution of the splashing secondary droplets obeys the gamma distribution function. The average diameter and splashing angle of the secondary droplets are mainly related to the Reynolds number Re, and can be expressed as functions of Re. High impact velocity and liquid viscosity will result in a wider size distribution range of splashing secondary droplets. We also put forward an empirical model to predict the total splashing volume, which is consistent with the experimental data both in this work and previous studies. This work is believed to provide insights on the prediction of the characteristics of splashing secondary droplets.

【 授权许可】

CC BY