Directional Motion of Coalesced Viscous Droplets on Fibers with Wettability Gradients
Zeming Fu, Huagen Wu, Yanling Xiong, Paolo Tronville
TL;DR
This study explores how oil droplets move directionally on fibers with wettability gradients, focusing on the effects of viscosity and droplet behavior.
Contribution
A novel dynamic contact angle model combined with VOF simulations reveals how wettability gradients influence droplet migration and viscous dissipation.
Findings
Droplets migrate directionally along wettability gradients, with higher gradients increasing migration velocity.
Low viscosity droplets show oscillations during acceleration, while high viscosity droplets move smoothly due to energy dissipation.
Normal strain dissipation accounts for about 63% of total viscous dissipation during droplet deformation.
Abstract
The coalescence and directional migration dynamics of oil droplets on wettability gradient fibers were investigated based on the volume of fluid (VOF) method combined with an improved dynamic contact angle model. We clarified the effects of initial configuration, wettability gradient, and liquid viscosity on droplet morphology, migration velocity and viscous dissipation. The results indicate that after coalescence, droplets migrate directionally along the wettability gradient, and a larger gradient leads to a higher migration velocity. Low viscosity droplets exhibit noticeable oscillations during acceleration, while high viscosity droplets move more smoothly due to increased energy dissipation. As viscosity increases from 0.024 Pa·s to 0.093 Pa·s, normal strain dissipation dominates the total viscous dissipation, accounting for about 63% at the peak stage, corresponding to liquid bridge…
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Taxonomy
TopicsSurface Modification and Superhydrophobicity · Innovative Microfluidic and Catalytic Techniques Innovation · Fluid Dynamics and Thin Films