Journal
JOURNAL OF FLUID MECHANICS
Volume 792, Issue -, Pages 850-868Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2016.105
Keywords
drops; drops and bubbles; microfluidics
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Funding
- STW
- NWO [11304]
- Austrian Federal Ministry of Economy, Family and Youth
- Austrian National Foundation for Research, Technology and Development from Lam Research AG
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A train of high-speed microdrops impacting on a liquid pool can create a very deep and narrow cavity, reaching depths more than 1000 times the size of the individual drops. The impact of such a droplet train is studied numerically using boundary integral simulations. In these simulations, we solve the potential flow in the pool and in the impacting drops, taking into account the influence of liquid inertia, gravity and surface tension. We show that for microdrops the cavity shape and maximum depth primarily depend on the balance of inertia and surface tension and discuss how these are influenced by the spacing between the drops in the train. Finally, we derive simple scaling laws for the cavity depth and width.
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