Scientists found flames that spin in circles faster than they’re actually supposed to be able to burn.
March 24, 2026
Original Paper
Edge-Stabilized Rotating Flames in a Circular Hele-Shaw Cell
arXiv · 2603.22116
The Takeaway
In narrow gaps, fire doesn't always just spread outward; it can spontaneously organize into a 'rotating flame' that glides along the edges of its container. These flames move at speeds that significantly exceed the chemical limit of how fast the gas mixture should be able to burn, defying standard intuition about fire behavior.
From the abstract
In this study, we report direct experimental observations of self-sustaining CH4-air rotating flames formed spontaneously in an unheated, open, circular Hele-Shaw cell. These flames are observed under fuel-rich conditions and exhibit stable traveling-wave patterns, with edge velocities that can significantly exceed the nominal flame speed of the unburned mixture. PLIF measurements across the central plane reveal that the flame front consists of a bibrachial structure, with a diffusion branch gli