Effects of a microscale ridge on dynamic wetting during drop impact. Issue 4 (1st October 2020)

• Record Type: Journal Article
• Authors: Rashidian, Hossein; Broom, Matheu; Willmott, Geoff R.; Sellier, Mathieu
• Is Part Of: Journal of the Royal Society of New Zealand. Volume 50:Issue 4(2020)
• Page Start: 523
• Page End: 537
• Publication Date: 2020-10-01
• Subjects: Drop impact -- surface ridge -- drop wetting -- high-speed photography -- Lattice Boltzmann method; Science -- Periodicals; 505
• DOI: 10.1080/03036758.2019.1706587
• Languages: English
• ISSNs: 0303-6758

Abstract

ABSTRACT: High-speed imaging of water drop impacts on a polymer surface have been used alongside two-dimensional Lattice Boltzmann simulations to investigate the conditions under which a spreading lamella submerges a small surface ridge. Three basic outcomes have been observed when the lamella comes into contact with the ridge: pinning, wetting and splashing. The effects of Weber number and the dimensionless distance between the impact point and the ridge are investigated, and a phase portrait of the different wetting outcomes is presented. For each of the potential outcomes, a side-by-side comparison of experimental and numerical results can be made. An energy balance approach is used to study the transitions between the different outcomes.