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

作　　者：Haixiang Zhang Ye Gao Xiwen Zhang Xian Yi Yanxia Du Feng He Zheyan Jin Pengfei Hao 

机构地区：[1]Applied Mechanics Laboratory,Department of Engineering Mechanics,Tsinghua University,100084 Beijing,China [2]Key Laboratory of Icing and Anti/De-Icing of Aerocraft,China Aerodynamics Research and Development Center,Sichuan 621000 Mianyang,China [3]School of Aerospace Engineering and Applied Mechanics,Tongji University,200092 Shanghai,China.

出　　处：《Advances in Aerodynamics》2021年第1期623-634,共12页空气动力学进展（英文）

基　　金：supported by the National Numerical Wind Tunnel Project(Grant No.NNW2019ZT2-B26 and NNW2019ZT2-B05);the National Key R&D Program of China(Grant Nos.2016YFC1100300 and 2017YFC0111100);the National Natural Science Foundation of China(Grant Nos.11635005,11632009,11972215 and 12072174).

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 rimsegmenting,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.

关 键 词：SPLASHING DROPLET Impact Secondary droplets 

分 类 号：TF7[冶金工程—钢铁冶金]