Controlling the impact dynamic behavior of a water-in-oil compound drop using the dielectrowetting effect

[Display omitted] •The dielectrowetting effect can control the impact behavior of a water-in-oil drop.•Surface wettability of the dielectrowetting substrate is reversible and controllable.•The maximum spreading factor presents two scale laws with Weber number.•Threshold value of the maximum aspect r...

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Bibliographic Details
Published in:Chemical engineering science 2023-06, Vol.273, p.118637, Article 118637
Main Authors: Zheng, Jiangen, Mao, Mengge, Liu, Nanxi, Zuo, Ping, Yu, Ting, Fang, Ranran, Vorobyev, Anatoliy, Chen, Guo
Format: Article
Language:English
Subjects:
Dielectrowetting
Drop impact
Water-in-oil compound drop
Wettability
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Summary:[Display omitted] •The dielectrowetting effect can control the impact behavior of a water-in-oil drop.•Surface wettability of the dielectrowetting substrate is reversible and controllable.•The maximum spreading factor presents two scale laws with Weber number.•Threshold value of the maximum aspect ratio is independent of surface wettability. Controlling the impact dynamic behavior of a water-in-oil compound drop is vital for applications such as the enhancement of printing resolution and the preparation of innovative liquid-separation materials and devices. A phase diagram is constructed between the impact behavior, Weber number, and equilibrium contact angle of the water drop. The dynamic impact behavior of water-in-oil compound drops can be effectively controlled by changing the surface wettability using the dielectrowetting effect. The maximum spreading factor βm at different wettabilities shares a similar scale law βm∝We0.17 for 45.75 
ISSN:0009-2509
1873-4405
DOI:10.1016/j.ces.2023.118637