Fig. 4.
Inert bead capture and transport by a roller vortex. a–c The snapshots demonstrate the capture and transport of a passive glass bead (dbead = 500 ± 25 μm). See also Supplementary Movie 2. The red curve marks the path traveled by the passive bead and the blue circle encloses the particles that are a part of the vortex. The arrow denotes the direction of the vortex rotation. b the scatterer is captured by the vortex through intermittent flocking. The passive particle is transported by the vortex for about 14 s. The vortex spontaneously disintegrates (frame c) to release the bead. The energizing field: B0 = 6.07 mT, fB = 43 Hz. The scale bars are 2 mm