TY - JOUR
T1 - Numerical study on the bouncing dynamics of droplets impacting on a macro-textured superhydrophobic surface
AU - Zhao, Jiayi
AU - Chen, Shuo
AU - Zhang, Kaixuan
AU - Cao, Damin
AU - Liu, Yang
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (Grant No. 12002212 , 11872283 ) and Shanghai Sailing Program (Grant No. 20YF1432800). The grant is gratefully acknowledged.
Publisher Copyright:
© 2022
PY - 2022/4/30
Y1 - 2022/4/30
N2 - The contact time of droplet impacting on surfaces involves in the extent of transformation between the droplet's surface energy and kinetic energy. Based on the axisymmetric assumption, the theoretical prediction of the contact time is regardless of impacting velocity of the droplet. In order to further reduce the contact time, a novel superhydrophobic surface with a macro-textured ridge was proposed by Bird et al [1]. to generate asymmetric bouncing behaviors of a droplet. In the present study, a detailed numerical simulation was carried out to investigate the bouncing dynamics of the impacting process of droplets on surface with a macro-textured ridge at various Weber (We) numbers by adopting many-body dissipative particle dynamics (MDPD). The bouncing dynamics of droplets can be mainly divided into two types, i.e. jug-like behavior with asymmetric retracting velocity and wing-like behavior with rotation of the sub-droplets. The angular velocity of droplets during rebounding is crucial for the corresponding contact time, where the step-like angular velocity at different We numbers are observed. Finally, a brief theoretical analysis was provided to reveal the critical We number and the limitation of contact time for the wing-like state. This work is helpful in understanding the reduction of contact time for droplet impacting on a macro-textured superhydrophobic surface, meanwhile, it offers a guidance for surface structural design where enough angular velocity of droplets should be produced during rebounding if the contact time needs to be decreased.
AB - The contact time of droplet impacting on surfaces involves in the extent of transformation between the droplet's surface energy and kinetic energy. Based on the axisymmetric assumption, the theoretical prediction of the contact time is regardless of impacting velocity of the droplet. In order to further reduce the contact time, a novel superhydrophobic surface with a macro-textured ridge was proposed by Bird et al [1]. to generate asymmetric bouncing behaviors of a droplet. In the present study, a detailed numerical simulation was carried out to investigate the bouncing dynamics of the impacting process of droplets on surface with a macro-textured ridge at various Weber (We) numbers by adopting many-body dissipative particle dynamics (MDPD). The bouncing dynamics of droplets can be mainly divided into two types, i.e. jug-like behavior with asymmetric retracting velocity and wing-like behavior with rotation of the sub-droplets. The angular velocity of droplets during rebounding is crucial for the corresponding contact time, where the step-like angular velocity at different We numbers are observed. Finally, a brief theoretical analysis was provided to reveal the critical We number and the limitation of contact time for the wing-like state. This work is helpful in understanding the reduction of contact time for droplet impacting on a macro-textured superhydrophobic surface, meanwhile, it offers a guidance for surface structural design where enough angular velocity of droplets should be produced during rebounding if the contact time needs to be decreased.
UR - http://www.scopus.com/inward/record.url?scp=85126857831&partnerID=8YFLogxK
U2 - 10.1016/j.compfluid.2022.105383
DO - 10.1016/j.compfluid.2022.105383
M3 - Journal article
AN - SCOPUS:85126857831
SN - 0045-7930
VL - 238
JO - Computers and Fluids
JF - Computers and Fluids
M1 - 105383
ER -