Modeling the dynamics of partially wetting droplets on fibers

Christianto, Raymond; Rahmawan, Yudi; Semprebon, Ciro; Kusumaatmaja, Halim

Abstract

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.

Citation

Christianto, R., Rahmawan, Y., Semprebon, C., & Kusumaatmaja, H. (2022). Modeling the dynamics of partially wetting droplets on fibers. Physical Review Fluids, 7(10), Article 103606. https://doi.org/10.1103/physrevfluids.7.103606

• Journal Article Type: Article
• Acceptance Date: Sep 26, 2022
• Online Publication Date: Oct 24, 2022
• Publication Date: 2022-10
• Deposit Date: Oct 25, 2022
• Publicly Available Date: Oct 25, 2022
• Journal: Physical Review Fluids
• Electronic ISSN: 2469-990X
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 7
• Issue: 10
• Article Number: 103606
• DOI: https://doi.org/10.1103/physrevfluids.7.103606
• Public URL: https://durham-repository.worktribe.com/output/1187642
• Related Public URLs: https://arxiv.org/abs/2209.10329