TY - JOUR
T1 - Universal scaling of droplet retraction dynamics on vibrating surfaces
AU - Song, Mingkai
AU - Liu, Xiaonan
AU - Wang, Ting
AU - Xu, Wanghuai
AU - Zhao, Shengteng
AU - Wang, Shunbo
AU - Wang, Zuankai
AU - Zhao, Hongwei
N1 - Funding Information:
We acknowledge the financial support from the National Natural Science Foundation of China (No. 51975502), the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (No. 52021003), the Research Grants Council of Hong Kong (Nos. SRFS2223-1S01, C1006-20W, 11213320, and 11219219), the Shenzhen Science and Technology Innovation Council (No. SGDX20201103093005028), the National Natural Science Foundation of Jilin Province (No. 20200201231JC), the Scientific Research Project of Jilin Provincial Department of Education (No. JJKH20220982KJ), and the Innovation and Technology Commission of Hong Kong (Nos. GHP/021/19SZ and GHP/092/20GD).
Publisher Copyright:
© 2023 Author(s).
PY - 2023/5/22
Y1 - 2023/5/22
N2 - Over the past decade, extensive efforts have been made in the study of droplet impact, especially on stationary surfaces, owing to its direct applications in thermal cooling, self-cleaning, and power generation. However, many practical applications, such as ultrasonic cleaning, aerosolized drug delivery, and vibration-assisted welding, involve the direct interaction of droplets with vibrating surfaces, on which droplets undergo spreading and retraction. Distinct from stationary surfaces where the retraction behaviors, such as the retraction velocity and rate, are mainly governed by the surface wettability and droplet inertia, the retraction behaviors on vibrating surfaces become complicated due to the vibration velocity, which dictates the outcomes of droplet impact, such as the pinning, bouncing, gyrating, and jetting. Here, we revealed the synergistic effect of droplet inertia and vibration velocity on droplet retraction. We found that the droplet retraction behaviors on both stationary and vibrating surfaces could be characterized by a universal scaling law, allowing us to analyze and predict the maximum droplet retraction velocities. Moreover, we found that the maximum retraction rate increased with the maximum spreading radius at low Weber numbers. We demonstrated that the droplet retraction dynamics at both low Weber numbers and high Weber numbers could be unified into one integrated model, which indicates the decisive role of the maximum droplet spreading in droplet retraction dynamics.
AB - Over the past decade, extensive efforts have been made in the study of droplet impact, especially on stationary surfaces, owing to its direct applications in thermal cooling, self-cleaning, and power generation. However, many practical applications, such as ultrasonic cleaning, aerosolized drug delivery, and vibration-assisted welding, involve the direct interaction of droplets with vibrating surfaces, on which droplets undergo spreading and retraction. Distinct from stationary surfaces where the retraction behaviors, such as the retraction velocity and rate, are mainly governed by the surface wettability and droplet inertia, the retraction behaviors on vibrating surfaces become complicated due to the vibration velocity, which dictates the outcomes of droplet impact, such as the pinning, bouncing, gyrating, and jetting. Here, we revealed the synergistic effect of droplet inertia and vibration velocity on droplet retraction. We found that the droplet retraction behaviors on both stationary and vibrating surfaces could be characterized by a universal scaling law, allowing us to analyze and predict the maximum droplet retraction velocities. Moreover, we found that the maximum retraction rate increased with the maximum spreading radius at low Weber numbers. We demonstrated that the droplet retraction dynamics at both low Weber numbers and high Weber numbers could be unified into one integrated model, which indicates the decisive role of the maximum droplet spreading in droplet retraction dynamics.
UR - http://www.scopus.com/inward/record.url?scp=85160666006&partnerID=8YFLogxK
U2 - 10.1063/5.0152599
DO - 10.1063/5.0152599
M3 - Journal article
AN - SCOPUS:85160666006
SN - 0003-6951
VL - 122
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 21
M1 - 214102
ER -