Blue Whirl – a fire tornado burning soot-free

Researchers described a previously unobserved flame phenomenon: blue whirl. Blue whirls evolve from typical yellow fire whirls, but are smaller, very stable and completely blue, indicating soot-free burning.

Credit:
From fire whirls to blue whirls and combustion with reduced pollution
Huahua Xiao, Michael J. Gollner, and Elaine S. Oran
PNAS doi:10.1073/pnas.1605860113

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