Experimental evidence for granular shear-flow instability in the Epstein regime - Communications Physics

Understanding the formation of planetesimals in protoplanetary disks requires insights into the instabilities caused by dust particles in gas streams. The authors use particle image velocimetry in microgravity to reveal a granular shear-flow instability, resembling a Kelvin-Helmholtz instability, offering a benchmark for two-fluid theories in planet formation.