期刊
ACS NANO
卷 8, 期 10, 页码 10352-10362出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn503643m
关键词
nanostructured surface design; coalescence; droplet jumping; microfluidics; condensation; wetting; superhydrophobic
类别
资金
- Industrial Development Agency (IDA) Ireland
- Irish Research Council for Science, Engineering, and Technology
- Marie Curie Actions under FP7
- MIT S3TEC Center, an Energy Frontier Research Center - Department of Energy, Office of Science, Basic Energy Sciences [DE-FG02-09ER46577]
- Office of Naval Research (ONR)
- National Science Foundation under NSF Award [ECS-0335765]
Surface engineering at the nanoscale is a rapidly developing field that promises to impact a range of applications including energy production, water desalination, self-cleaning and anti-icing surfaces, thermal management of electronics, microfluidic platforms, and environmental pollution control. As the area advances, more detailed insights of dynamic wetting interactions on these surfaces are needed. In particular, the coalescence of two or more droplets on ultra-low adhesion surfaces leads to droplet jumping. Here we show, through detailed measurements of jumping droplets during water condensation coupled with numerical simulations of binary droplet coalescence, that this process is fundamentally inefficient with only a small fraction of the available excess surface energy (less than or similar to 6%) convertible into translational kinetic energy. These findings clarify the role of internal fluid dynamics during the jumping droplet coalescence process and underpin the development of systems that can harness jumping droplets for a wide range of applications.
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