model lesson on parts of flame by vijay grover
TRANSCRIPT
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Parts of Candle Flame
Objectives:• Name of parts of candle flame• Composition of parts of candle flame• Temperature of candle flame• Nature of candle flame• Significance of parts of candle flame
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Definition of Flame
• A space /zone of burning of gas or vapor fuel to cover considerable region with constant shape maintained by the supply of fuel.
• The fuel can be solid, liquid or gas but finally burn as gas
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Flame & its Types
• Flame: • Types of Flamea) Laminar diffusion
Flameb) Premixed Flame
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How it works
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Structure of a candle flame
Outer zone (blue)
Middle zone (yellow)
Inner zone (black)
(Complete combustion)
(Partial combustion)
Unburnt wax vapours
Hottest part
Moderately hot
Least hot
Luminous zone
Non luminous zone
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Parts of Candle Flame
Zone 1: Dark zone (Fuel Evaporation)Zone 2: Blue zone (Complete Burning)Zone 3: Dark zone (Fuel Pyrolysis)Zone 4: Luminous zone (Partial Burning)Zone 5: Veil/Non Luminous zone (Complete Burning)
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Emissions and Temperature
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Heat, Light & Shape of Flame
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Sectional RecapitulationSelect the correct response1. Hottest zone of candle flame is _______a) Non luminous zone b) Dark zone c) Luminous zone d) none of
the above 2. Lowest temperature zone is _________b) Non luminous zone b) Dark zone c) Luminous zone d) none of
the above3. Complete burning of fuel tales place in ____c) Black zone b) Blue zone c) Yellow zone d) all of the above4. Match the followingd) Pyrolysis i) Blue zonee) CO2 & H2O ii) Non-luminous zone f) Maximum oxygen iii) Luminous zoneg) Partial combustion iv) Dark zone
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Nature of Zones of Flame
• Oxidizing Flame
• Reducing Flame
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Some Experiments by Michael Faraday (1861)
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Environmental Impact of Flame
Observed air concentrations (in mg/m3) of various compounds subsequent to burning the equivalent of 600 g of candle mass, or one cigarette, in a room (50 m3) where no air exchange is taking place
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Final RecapitulationSelect the correct response1. Oxidizing flame isa) Dark zone b) Luminous zone c) Non-luminous zone d) dead space
2. Reducing flame containsa)Carbon b)Water c)Carbon monoxide d) Carbon dioxide
Select True/False3. Wax is a hydrocarbon (T/F) 4. Candle flame is a premixed type flame (T/F)5. Dead space is zone is also called main reaction zone (T/F)6. Wax burns in vapor state in a candle (T/F)7. All fuels form flame (T/F)8.Dominant Yellow color of flame is due to CO gas (T/F)
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Thanks for Being Patient
Dr. Vijay GroverDAV College of Education, Abohar