Jump to main content
Jump to site search


Hysteresis in spreading and retraction of liquid droplets on parallel fiber rails

Abstract

Wetting and spreading of liquids on fibers occurs in many natural and artificial processes. Unlike on a planar substrate, a droplet attached to one or more fibers can assume several different shapes depending on geometrical parameters such as liquid volume and fiber size and distance. This paper presents lattice Boltzmann simulations of the morphology of liquid droplets on two parallel cylindrical fibers. We investigate the final shapes resulting from spreading of an initially spherical droplet deposited on the fibers and from retraction of an initial liquid column deposited between the fibers. We observe three possible equilibrium configurations: barrel-shaped droplet, droplet bridges, and liquid columns. We determine the complete morphology diagram for varying inter-fiber spacing and liquid volume and find a region of bistability that spans both the column regime and the droplet regime. We further present a simulation protocol that allows to probe the hysteresis of transitions between different shapes. The results provide insights into energies and forces associated with shape transformations of droplets on fibers that can be used to develop fiber-based materials and microfluidic systems for manipulation of liquids at small scale.

Back to tab navigation

Supplementary files

Article information


Submitted
23 Jan 2021
Accepted
20 Apr 2021
First published
21 Apr 2021

Soft Matter, 2021, Accepted Manuscript
Article type
Paper

Hysteresis in spreading and retraction of liquid droplets on parallel fiber rails

F. Wang and U. D. Schiller, Soft Matter, 2021, Accepted Manuscript , DOI: 10.1039/D1SM00126D

Social activity

Search articles by author

Spotlight

Advertisements