Image: Freepik.
Image: Freepik. The effect is well known from coffee commercials: 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 a coffee surface, another interesting effect is observed: the tower of liquid will be mostly white. That is, it is not the coffee that splashes upward, it is the milk that 'bounces back'. Not just gravity.
TO READ THIS ARTICLE, CREATE YOUR ACCOUNT
And extend your reading, free of charge and with no commitment.
