American Chemical Society
Browse
jz0c00788_si_001.pdf (289.12 kB)

Contact Time of a Bouncing Nanodroplet

Download (289.12 kB)
journal contribution
posted on 2020-03-25, 18:46 authored by Fang-Fang Xie, Shu-Hang Lv, Yan-Ru Yang, Xiao-Dong Wang
We study the bouncing dynamics of nanodroplets on superhydrophobic surfaces. We show that there are three velocity regimes with different scaling laws of the contact time, τ. Although τ remains constant over a wide velocity range, as seen for macroscale bouncing, we demonstrate that viscosity plays an essential role in nanodroplet bouncing even for low-viscosity fluids. We propose a new scaling τ ∼ (ρμR042)1/3 = (R0/v0)We2/3Re–1/3 to characterize the viscosity effect, which agrees well with the simulated results for water and argon nanodroplets with various radii and hydrophobicities. We also find pancake bouncing of nanodroplets, which is responsible for an abruptly reduced τ in a high-velocity regime.

History