Vaibhavi Manjarekar
Research Mentor(s): Solomon Adera
Mentor Department: MechE
Authors: Vaibhavi Manjarekar, Vaibhavi Manjarekar, Solomon Adera
Session: Session 6 (3:00pm – 3:50pm)
Presentation Type: Poster 17
Abstract
The study of droplet impact is important for many industrial applications including inkjet printing, spray coating, and impingement cooling. It has been shown that the number of fingers is often determined and can be predicted by the microstructure design. However, present models of drop impact dynamics are mostly based on flat surfaces as opposed to micropillar arrays. Here, we experimentally characterize and model drop impact dynamics using high-speed imaging. Specifically, we investigate post-impact fingering and breakup of the radially expanding thin liquid sheet. The effect of Weber and Reynolds number as well as the micropillar array shape and structure on fingering is investigated by analyzing high-speed images (1000 frames-per-second or more) of drop impact. The release height for the drop varies to span a wide range of Reynolds number and Weber number. Moreover, the micropillar shape and geometrical features were varied to decipher their impact in the resulting drop break dynamics. The insights gained from this work improve current state-of-the-art understanding of drop impact dynamics on micro/nanotextured surfaces.
