Air rings blown by dolphins swimming underwater and rings of smoke emitted by jet engines are just two examples of vortex rings. These doughnut-shaped structures and their mesmerizing movement have ...

Helical vortex rings are intriguing flow phenomena observed in both classical and quantum fluids, playing a crucial role in the examination of turbulence. Despite significant research dedicated to ...

Fighting fire usually involves water or foam, but they can be messy and environmentally destructive. Engineers at Ohio State University have now developed handheld tools that cleanly extinguish fires ...