Viscous Flow
Objects flowing through highly viscous fluids give rise to well-structured flow patterns. Such flows look like stacks of thin laminae, so-called laminar flows. Here, a sphere is submerged near the free surface of a tow-tank filled with silicon oil, which is 5,000 times more viscous than water.
Image credit: Shelley Chan, Josue Sznitman, Alexander J. Smits & Princeton University Art of Science Competition
