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Shape evolution of drops on surfaces of different wettability gradients
Published in Elsevier Ltd
2021
Volume: 229
   
Abstract
Passive droplet manipulation on open surfaces can be achieved by creating a wettability gradient on surfaces, which is essential in the fabrication of low cost biological and biochemical chips. We performed 3D numerical simulations to analyze the droplet motion on a broad range of wettability gradient surfaces. We found that the droplet shape evolves with time to maintain a minimum energy state, and the surface energy of the droplet is identical at a particular non-dimensional time (t∗) for different wettability gradient surfaces. Although the droplet is at various locations at a fixed t∗, the shape of the droplet is found to be identical. The physics behind this interesting phenomenon of identical droplet shape formation is explored. A co-relation for t∗ is proposed to get the dependency of t∗ on various geometrical parameters and fluid properties. Three distinct regimes of the droplet identical shape on different wettability gradient surfaces are shown using a regime plot. Along with the identical droplet shape phenomena, the detailed understanding of the dynamics of the droplet shape evolution on different wettability gradient surfaces gives an insight for better open surface passive manipulation. © 2020 Elsevier Ltd
About the journal
JournalData powered by TypesetChemical Engineering Science
PublisherData powered by TypesetElsevier Ltd
ISSN00092509
Open AccessNo