#viscosity — Public Fediverse posts

Plucking Droplets

A sudden breeze can pluck droplets hanging from a stem. Here, researchers recreate that phenomenon in the laboratory. With a close-up view and high-speed images, we can enjoy every detail of the detachment and break-up. As the wire pulls away, it drags a liquid sheet off the droplet. The thicker rims on either side of the sheet eventually collide, creating a jet that stretches, deforms, and, at last, breaks. (Video and image credit: D. Maity et al.)

Competing Time Scales

Fluid dynamics often comes down to a competition between the different forces acting in a flow. Inertia, surface tension, viscosity, gravity, rotation — flows can be affected by all of these and more. In this video, researchers describe the three dominant forces in a rotating fluid like a planet’s atmosphere: viscosity, the fluid’s resistance to flowing; inertia, the fluid’s resistance to accelerating; and rotation, the overall spin of a fluid.

As shown in the video, which of these three forces dominates will change depending on the speed at which the force acts. We quantify this concept using time scales; the force with the smallest time scale can act fastest and will, therefore, win the tug-of-war. (Video and image credit: UCLA SpinLab)

#DIYFluids #flowVisualization #fluidDynamics #inertia #mathematics #physics #rotatingFlow #science #viscosity

Thomas Strassner and Stefan Fritsch @tudresden present a new class of tunable aryl alkyl ionic liquids (TAAILs) ➡️ https://www.beilstein-journals.org/bjoc/articles/20/110?M=y

#conductivity #IonicLiquids #viscosity
#DiamondOpenAccess 💎🔓 #BJOC

'Large data limit of the MBO scheme for data clustering: convergence of the dynamics', by Tim Laux, Jona Lelmi.

http://jmlr.org/papers/v24/22-1089.html

#viscosity #clustering #curvature

What is the scientific word for a Fluid or semi-Fluid that holds its bead when put on a surface. Think ketchup. You could write with it, and the ketchup would mostly hold its location and height.

Is this viscosity also? Or is there a word for the vertical strength of a liquid/gel

#hydrodynamics #science #engineering #liquid #gel #viscous #viscosity