Impingement and mixing dynamics of micro-droplets on a solid surface  

作　　者：Guina Yi Ziqi Cai Zhengming Gao J.J.Derksen 

机构地区：[1]Beijing Advanced Innovation Center for Soft Matter Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China [2]State Key Laboratory of Chemical Resource Engineering,School of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029,China [3]School of Engineering,University of Aberdeen,Aberdeen AB243UE,UK

出　　处：《Chinese Journal of Chemical Engineering》2022年第12期66-77,共12页中国化学工程学报（英文版）

基　　金：financial support from National Natural Science Foundation of China(22078008,22178014);the Fundamental Research Funds for the Central Universities(XK1802-1)。

摘　　要：The hydrodynamics and mixing during the nonaxisymmetry impingement of a micro-droplet and a sessile droplet of the same fluid are investigated by many-body dissipative particle dynamics(MDPD) simulation.In this work,the range of the impingement angle(θ_(i)) between the impinging droplet and the sessile droplet is 0°-60° and the contact angle is set as 45° or 124°.The droplets impingement and mixing behavior is analyzed based on the droplet internal flow field,the concentration distribution and the time scale of the decay of the kinetic energy of the impinging droplet.The dimensionless total mixing time(τ_(m)) is calculated by a modified mixing function.With the Weber number(We) ranging from 5.65 to22.7 and the Ohnesorge number(Oh) ranging from 0.136 to 0.214,we find rm hardly changes with We and Oh.Whereas,θ_(i)and surface wettability are found to have a significant effect on τ_(m).We find that θ_(i)has no clear effect on τ_(m)on a hydrophobic surface,while on the hydrophilic surface,τ_(m)increase with the θ_(i).Thus,reducing the impinging angle is a valid method to shorten the τ_(m).

关 键 词：Droplets impingement Mixing behavior Mixing time Concentration distribution Many-body dissipative particle dynamics 

分 类 号：TQ021.1[化学工程]