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Encyclopedia > Diffusion flame
A nearly-turbulent diffusion flame.
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A nearly-turbulent diffusion flame.


In combustion, a diffusion flame is a flame in which the oxidizer combines with the fuel by diffusion. As a result, the flame speed is limited by the rate of diffusion. Diffusion flames tend to burn slower and to produce more soot than premixed flames because there may not be sufficient oxidizer for the reaction to go to completion, although this is not a rule. Diffusion flames tend to have a less-localized flame front than premixed flames. Combustion or burning is a chemical process, an exothermic reaction between a substance (the fuel) and a gas (the oxidizer), usually O2, to release heat. ... It has been suggested that this article or section be merged into Fire. ... An oxidizing agent is a substance that oxidizes another substance in electrochemistry or redox chemical reactions in general. ... For the workstation, see SGI Fuel. ... Schematic drawing of the effects of diffusion through a semipermeable membrane. ...


The contexts for diffusion may vary. A candle uses evaporation to supply its wax fuel, and its oxidizer diffuses from the surroundings; a stove powered by natural gas may use a high-pressure jet of natural gas from a gas line. A lit candle. ... Evaporation is the process whereby atoms or molecules in a liquid state (or solid state if the substance sublimes) gain sufficient energy to enter the gaseous state. ... Wax has traditionally referred to a substance that is secreted by bees (beeswax) and used by them in constructing their honeycombs. ... A stove is a heat-producing device. ... Natural gas (commonly referred to as gas in many countries, but note that gas is also an American and Canadian shortening of gasoline) is a gaseous fossil fuel consisting primarily of methane. ... Pressure (symbol: p) is the force per unit area acting on a surface in a direction perpendicular to that surface. ...

A gas burner. Here the tight conical portion of the flame is the premixed flame front; the diffuse blue above it is primarily a diffusion flame.
A gas burner. Here the tight conical portion of the flame is the premixed flame front; the diffuse blue above it is primarily a diffusion flame.
In zero gravity, convection does not carry the hot combustion products away from the fuel source, resulting in a spherical flame front, such as this candle seen here.
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In zero gravity, convection does not carry the hot combustion products away from the fuel source, resulting in a spherical flame front, such as this candle seen here.

Wikipedia does not have an article with this exact name. ... Wikipedia does not have an article with this exact name. ... Astronauts on the International Space Station display an example of weightlessness Weightlessness is the experience (by people and objects) during freefall, of having no weight. ...

See also

External links

  • Diffusion flames in microgravity, NASA

 
 

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