When the cool and hot zones of a non luminous flame’s air control valve is closed, the gas in which will be in placed as first and as it encounters air as it was in the mouth of the burner, there will be a presence of incomplete mixing, causing a combustion which would be incomplete and will also lead to a process that can’t be controlled, resulting to flame that is cool.
When the air control valve is closed in a nonluminous flame, the flame will turn to a luminous flame.
A nonluminous flame refers to a flame that emits little light in a not usable region of the visible light spectrum.
When the air control valve is closed in the zones of a nonluminous flame, it should be noted that one will not be able to see the zones. Nonluminous flame requires enough oxygen supply. The flame will then turn to a luminous flame.
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