Here’s a ferrofluid video with a little more explanation about how ferrofluids work. Surfactants prevent the tiny magnetic particles suspended in the fluid from separating out when exposed to a Keep reading
Dyed milk pulls away after a drop of acetone is added. The acetone creates a gradient in the surface tension, which causes mass flow due to the Marangoni effect. See Keep reading
Sadly, this video shows no droplet impacts on a heart-shaped post, but maybe you can imagine what it would look like after seeing other geometrical shapes. Happy Valentine’s Day, guys!
The Leidenfrost effect occurs when a liquid encounters a surface with a temperature much higher than its boiling point. Some of the liquid is instantly vaporized and then a droplet Keep reading
One of the characteristics of turbulence is its large range of lengthscales. Consider the ash plume from this Japanese volcano. Some of the eddy structures are tens, if not hundreds, Keep reading
@spooferbarnabas asks: I was wondering what the difference is between Froude’s number and Reynold’s number? they seem very similar Fluid dynamicists often use nondimensional numbers to characterize different flows because Keep reading
The pistol shrimp (or pistol crab) is a finger-sized crustacean with a fluid dynamical superpower. When it snaps its claw, a jet of water shoots out so quickly (62 mph) Keep reading
This photo shows the development of a flow instability in an axisymmetric jet. On the left, the jet is smooth and fully laminar, but, by the center of the photo, Keep reading
Dr. Seussian Mystery Fluid Could Have Saved Top Kill Wired article about using non-Newtonian fluids to plug leaking oil wells as we featured previously.
lazenby asks: Have you seen these guys? http://web.mit.edu/hml/ncfmf.html Yes, absolutely! Those videos, which date from the 1960s, are so useful that they’re still shown to undergraduates today. (Or at least Keep reading