期刊
PHYSICAL REVIEW LETTERS
卷 122, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.122.104501
关键词
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资金
- EPSRC [EP/N016602/1, EP/P020887/1, EP/P031684/1, EP/R007438/1]
- Leverhulme Trust
- Royal Academy of Engineering under the Chair in Emerging Technologies scheme
- EPSRC [EP/N016602/1, EP/P020887/1, EP/R007438/1, EP/S029966/1, EP/P031684/1] Funding Source: UKRI
The classical notion of the coalescence of two droplets of the same radius R is that surface tension drives an initially singular flow. In this Letter we show, using molecular dynamics simulations of coalescing water nanodroplets, that after single or multiple bridges form due to the presence of thermal capillary waves, the bridge growth commences in a thermal regime. Here, the bridges expand linearly in time much faster than the viscous-capillary speed due to collective molecular jumps near the bridge fronts. Transition to the classical hydrodynamic regime only occurs once the bridge radius exceeds a thermal length scale l(T) similar to root R.
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