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Studies of coalescences of free falling droplets

We have designed an experimental system where we can levitation 10-30 micrometer sized liquid droplets. The droplets can be positioned with sub-micrometer resolution. The droplets are released from the traps by turning off the lasers with fast shutters. We then used two orthogonally oriented high speed cameras to monitor the falling droplets. This allows us to record, in three dimensions, how the droplets fall and collide under gravity. The spatial resolution is below 1 m and the temporal resolution is in the s range. Our goal is to study under which conditions two water droplets which collide will coalesce. We have for these studies developed a system where we can control all experimental parameters such as droplet size and charge, particles velocity and impact parameters. The video to the right shows how two 30 m droplets which fall under gravity collide and eventually coalesce. The aim with the research project is to obtain data on binary collisions that can be used to model droplet coalescence in turbulent clouds.

Page Manager: Måns Henningson|Last update: 2/28/2019

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