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From fire whirls to blue whirls and combustion with reduced pollution #MMPMID27493219
Xiao H; Gollner MJ; Oran ES
Proc Natl Acad Sci U S A 2016[Aug]; 113 (34): 9457-62 PMID27493219show ga
The growing worldwide demand to reduce emissions from combustion calls for development of alternative technologies for high-efficiency and low-emission combustion. Whereas fire whirls are known for their intense and disastrous threat to life and surrounding environments, their swirl properties and thus higher combustion efficiency imply an unexploited potential for highly efficient, low-emission combustion. In studying fire whirls over water for oil-spill cleanup, we discovered a beautiful, swirling flame phenomenon, the ?blue whirl,? which evolves from a fire whirl and burns with nearly soot-free combustion. Understanding and control of the blue whirl and its predecessor, the fire whirl, will suggest new ways for fuel-spill remediation, reduced-pollution combustion, and fluid mechanics research.