Question

what is the difference between Luminous and non luminous zone of flame

Answer 1

luminous zone in flame takes place in the centre of flame whereas outer part of the frame known as non luminous but massive heat there meanwhile low hotness in the centre of the flame.

Answer 2

Hey mate here is your answer:-)

Luminous flames are normally orange, while Non-luminous flames are normally blue and quite difficult to spot from afar. The colour of orange in the flame is basically the black-body emission of hot particles of soot in the flame, which make it glow like the filament of the light bulb. In the case of the Non-luminous flames, the blueish colour is the result as there are no particles of soot to give that orange glow. the blue is from the emission of the high energy C2 molecules

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