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Why slow-pouring coffee makes a tower of liquid in your cup – Phys.org

When a droplet of coffee hits the liquid surface in the cup, a characteristic tower of coffee forms for a very short time, sometimes even with a new droplet on…

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When a droplet of coffee hits the liquid surface in the cup, a characteristic tower of coffee forms for a very short time, sometimes even with a new droplet on top. In a paper that appeared in Physical Review Fluids today, a team of researchers from Amsterdam, Delft and Paris shed new light on this intricate effect.
The effect of jet formation is not particular to coffee: the same effect can be seen for example when a rain drop hits a pond. When instead of coffee, a droplet of milk is dropped on…

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