What is it about?
A ring-rivulets is an rivulet where both ends are connected. This liquid structure is unstable, it either breaks up into several small droplets or collapse towards a single drop in the center. We show that upon tuning the substrate, make it more or less wettable, the two outcomes can be translated into each other.
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Photo by Mohan Murugesan on Unsplash
Why is it important?
Generating droplets with a defined size is not an easy task. Understanding instabilities of liquid rivulets may help with the generation of on demand micro and nano droplets.
Perspectives
This was a fun last project during my time in Denmark, working with the excellent fluid dynamics Professor Johan Roenby. The article considers a seemingly simple system, the ring-rivulet, that actually offers quite some complexity. Showing that wettability among other things also influences the dynamics was rather rewarding.
Stefan Zitz
Research Center Pharmaceutical Engineering
Read the Original
This page is a summary of: Instabilities of ring-rivulets: Impact of substrate wettability, The Journal of Chemical Physics, May 2025, American Institute of Physics,
DOI: 10.1063/5.0256308.
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