Question

what are Luminous and non luminous zones of a flame

Answer 1

HERE IS YOUR ANSWER . A luminous flame is a flame that provides light and is in bright yellow color. A luminous flame is a flame that does not get sufficient amount of oxygen and therefore, undergoes incomplete combustion whereas a nonluminous flame is much hotter and colorless and it undergoes complete combustion in the presence of sufficient oxygen. In a candle flame, a quarter of the energy created is released as heat.

A candle flame consists of several different zones with different temperatures. Colors tell us the temperature of the flame.

Outer zone

Middle zone

Inner zone

The outermost zone is the hottest among all zones and is blue in color, and this is due to complete combustion. It is the non-luminous part of the flame.

The middle zone of the candle flame is moderately hot and is yellow in color, and partial combustion of fuel takes place. It is bright part of the fire.

The innermost zone of the flame is the least hot and is black in color. This is due to the presence of unburnt wax vapors.:):):):):):):):)
I HOPE ITS HELP YOU

Answer 2

Ans: Substances which vaporize during burning gives flame.
The substance which does not vaporize during burning does not produce flame.
Flame is of two types.
1.      Luminous flame
2.      Non-luminous flame.
(1). Luminous flame: A luminous flame is a bright yellow flame which gives of light.
(2). Non-luminous flame: A non-luminous flame does glow as bright as luminous flame.
It undergoes complete oxidation, so it gets much hot (high temperature) than luminous flame.