Fig. 3: Other intriguing observations of the vortex rings.
From: Imaging quantized vortex rings in superfluid helium to evaluate quantum dissipation
a A superimposed image showing a heavily doped vortex ring gradually flipping downward while it shrinks. b Simulated motion of a vortex ring with the same initial profile carrying 36 D2 particles (4.9 μm in radius) using the S2W model. c Images showing how the D2 particles trapped on a vortex ring eventually form a cluster that falls freely in He II. d Measured centroid velocity of the trapped D2 particles shown in c. The error bars denote the standard deviation associated with the data due to the uncertainties of the centroid position (see Methods).
