In the fluid transport of particles, it is generally expected that heavy particles carried by a laminar fluid flow moving downward will also move downward. We establish a theory to show, however, that particles can be dynamically levitated and lifted by such flows, thereby moving against the flow and against gravity, even when they are orders of magnitude denser than the fluid. We suggest that this counterintuitive effect has potential implications for the air-transport of water droplets and the lifting of sediments in water.
Levitation of heavy particles against gravity and against the flow
Jean-Regis Angilella, Daniel J. Case, Adilson E. Motter
Chaos 27, 031103 (2017)