Work

Topological change of a hollow droplet impacting onto a cylindrical super-hydrophobic target: A numerical study

Year: 2025

Type: article

Abstract: In this paper, we numerically investigate the dynamics of a hollow droplet impacting onto a small super-hydrophobic cylinder. Four distinct regimes are identified based on the topological changes experienced by the droplet during impact: direct bounce, break-retract, break-break, and rim break. The transitions between these regimes are discussed with respect to dimensionless parameters such as the Weber number and the droplet-to-target diameter ratio . Additionally, we propose theoretical predictions for these regime transitions, which show reasonable agreement with our numerical results. This study provides insights into the dynamics of hollow droplets impacting on rough surfaces and has potential applications in altering the topology of hollow and other compound droplets.

Source: International Journal of Multiphase Flow

DOI: 10.1016/j.ijmultiphaseflow.2025.105227

Authors: Linkai Yang, Longmin Tang, Guangzhao Zhou

Institutions: University of Chinese Academy of Sciences, Chinese Academy of Sciences, Institute of Mechanics, State Key Laboratory of Nonlinear Mechanics

Language: English

Topic: Fluid Dynamics and Heat Transfer

Subfield: Computational Mechanics

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,900

Funders: National Natural Science Foundation of China, Fundamental Research Funds for the Central Universities