Aqueous Drop-on-Drop Impact on Super-Repellent Surface

Han, Xing1,2; Tang, Xin1,2; Zhao, Haibo1,2,3; Li, Jiaqian1,2; Li, Wei1,2; Wang, Liqiu1,2

2021-11-01

10.1002/admi.202101565

Advanced Materials Interfaces   影响因子和分区

2196-7350

Antiliquid-accumulation on the surface is desired in practical applications. Super-repellency of the surface reduces the interaction between impacting drop and the surface effectively. However, for horizontal super-repellent surfaces, super-repellency is not enough for liquid removal when drops keep coalescing and remain on the surface. The interaction between impacting drop and static drop can further be beneficial for antiliquid-accumulation on the surface. Here, aqueous drop-on-drop impact on the super-repellent surface is studied. Weber number of impacting drop and offset distance between drops control impacting outcomes (coalescence or bouncing), while the viscosity of drops influences fluid dynamics after the coalescence. The efficiency of released excess surface energy transferred into mechanical energy during coalescence can be 18.9% for upcoalescence, which is much higher than the efficiency for downcoalescence or in-plane coalescence (approximate to 6%) as reported in the literature. The bouncing between drops can reduce liquid accumulation on a super-repellent wafer remarkably (99.1 vol% reduction of accumulated liquid), being a promising method for liquid removal.

antiaccumulation of liquid aqueous drop-on-drop impact coalescence of drops drop bouncing super-repellent surfaces

SCI ; EI

英语

其他

Research Grants Council of Hong Kong["GRF 17204420",17210319,17204718,17237316,"CRF C1006-20WF","C1018-17G"]

Chemistry ; Materials Science

Chemistry, Multidisciplinary ; Materials Science, Multidisciplinary

WOS:000722179200001

WILEY

20214911290445

Coalescence ; Drops ; Flocculation

Colloid Chemistry:801.3 ; Chemical Operations:802.3

Web of Science

1.Univ Hong Kong, Dept Mech Engn, Kowloon, Hong Kong 999077, Peoples R China
2.Univ Hong Kong, Zhejiang Inst Res & Innovat, Hangzhou 311300, Zhejiang, Peoples R China
3.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Guangdong, Peoples R China

Han, Xing,Tang, Xin,Zhao, Haibo,et al. Aqueous Drop-on-Drop Impact on Super-Repellent Surface[J]. Advanced Materials Interfaces,2021,9.

Han, Xing,Tang, Xin,Zhao, Haibo,Li, Jiaqian,Li, Wei,&Wang, Liqiu.(2021).Aqueous Drop-on-Drop Impact on Super-Repellent Surface.Advanced Materials Interfaces,9.

Han, Xing,et al."Aqueous Drop-on-Drop Impact on Super-Repellent Surface".Advanced Materials Interfaces 9(2021).