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

Wang, Fang; Schiller, Ulf

doi:10.1039/d1sm00126d

Cited by 8 publications

(1 citation statement)

References 49 publications

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“…In addition, more complex fiber geometries have been investigated. These include conical fibers [20][21][22][23], where the curvature asymmetry can be exploited to drive self-propulsion; fiber cross-junctions [24,25], where the droplet trajectory can be tuned, for example, as the droplet size and orientation of the driving force is varied; and multiple parallel fibers, both when the fibers are rigid and flexible [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Modeling the dynamics of partially wetting droplets on fibers

et al. 2022

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We simulate gravity-driven dynamics of partially wetting droplets moving along a fiber using the lattice Boltzmann method. For the so-called clamshell morphology, we find three possible dynamic regimes upon varying the droplet Bond number and the fiber radius: compact droplet, droplet breakup, and droplet oscillation. For small Bond numbers, in the compact droplet regime, the droplet reaches a steady state and its velocity scales linearly with the driving body force. We find two scaling laws depending on whether the droplet size is smaller or larger compared to the fiber radius. In addition, we further identify a scaling law applicable for the barrel morphology. For higher Bond numbers, in the droplet breakup regime, satellite droplets are formed trailing the initial moving droplet. We find such droplet satellite formation is easier with increasing fiber curvature (smaller fiber radius). Finally, in the droplet oscillation regime, favored in the midrange of fiber radius, the droplet shape periodically extends and contracts along the fiber.

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Section: Introductionmentioning

confidence: 99%

Modeling the dynamics of partially wetting droplets on fibers

et al. 2022

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Topological heterogeneity and evaporation dynamics of irregular water droplets

Kim

Gonçalves

Kim

et al. 2021

Sci Rep

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Water droplets sitting between wires are ubiquitous in nature and industry, often showing irregular (non-spherical) droplet shapes. To understand their topological singularity and evaporation mechanism, measuring volume changes of irregular water droplets is essential but highly challenging for small-volume water droplets. Here we experimentally explore topological heterogeneity and evaporation dynamics for irregular water droplets between wires with four-dimensional X-ray microtomography that directly provides images in three spatial dimensions as a function of time, enabling us to get three-dimensional structural and geometric information changes with time. We find that the topological heterogeneity of an irregular droplet is due to the local contact lines and the evaporation dynamics of an irregular droplet is governed by the effective contact radius. This study may offer an opportunity to understand how the topological heterogeneity contributes to the evaporation dynamics of irregular water droplets.

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