Flaming fuel on water creates ‘blue whirl’ that burns clean

Method may have practical use in fuel spill cleanup

blue whirls

BLUE WHIRL  A swirling flame called a blue whirl is produced in the lab by igniting fuel floating on top of water (left). The flame first transitions into a 60-centimeter-tall fire tornado (center) before settling down into a quietly spinning blue flame (right) just 6 centimeters in height.

H. Xio, M.J. Gollner, E.S. Oran/PNAS 2016

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