A New Theoretical Model for Coalescence-Induced Droplet Jumping on Hydrophobic Fibers

作者：Li, Bingbing; Xin, Feng; Tan, Wei^*; Zhu, Guorui^*

来源：Industrial & Engineering Chemistry Research, 2018, 57(24): 8299-8307.

DOI：10.1021/acs.iecr.8b00716

• CONTACT ANGLES
• CONDENSATION
• SURFACES

A new theoretical model that accounts for the excess surface energy, viscous dissipation, surface adhesion, the droplet wetting state, the droplet and fiber radii, and the fiber surface property is developed to predict the coalescence-induced droplet jumping velocity on hydrophobic fibers. The effects of the droplet and fiber radii on the energy terms, the jumping velocity, and the jumping critical contact angle of symmetric and/or asymmetric coalescence are investigated. The results indicate that for the symmetric coalescence, the jumping velocity falls after first increasing along with the increase of the radii of the droplets, despite the larger excess surface energy. However, for the asymmetric coalescence, the highest jumping velocity is achieved when the droplets have the same size. With the increase of the radii difference between the two coalesced droplets, the jumping velocity gradually decreases, even if a greater excess surface energy is released upon coalescence.

• 出版日期2018-6-20
• 单位天津大学