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Images of the FASP unit forming Bi2O3 nanoparticles with the ring issuing 2.5 L/min C2H2 at HAN of a 1 and b 3 cm. In both cases the spray jet of bismuth nitrate in ethanol/nitric acid solution is seen below the C2H2 ring that results in stable spray combustion. The bright yellow flame is wider and shorter at larger HAN as the spray droplets disperse and their velocity decreases
