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- Q909245 subject Q10800507.
- Q909245 subject Q8226663.
- Q909245 abstract "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 there are some exceptions to the rule. The soot typically produced in a diffusion flame becomes incandescent from the heat of the flame and lends the flame its readily identifiable orange-yellow color. Diffusion flames tend to have a less-localized flame front than premixed flames.The contexts for diffusion may vary somewhat. For instance, a candle uses the heat of the flame itself to vaporize its wax fuel and the oxidizer (oxygen) diffuses into the flame from the surrounding air, while a gaslight flame (or the safety flame of a bunsen burner) uses fuel already in the form of a vapor. Diffusion flames are often studied in counter flow (also called opposed jet) burners. Their interest is due to possible application in the flamelet model for turbulent combustion. Furthermore they provide a convenient way to examine strained flames and flames with holes. These are also known under the name of "edge flames", characterized by a local extinction on their axis because of the high strain rates in the vicinity of the stagnation point.Diffusion flames have an entirely different appearance in a microgravity environment. There is no convection to carry the hot combustion products away from the fuel source, which results in a spherical flame front, such as in the candle seen here. This is a rare example of a diffusion flame which does not produce much soot and does not therefore have a typical yellow flame.".
- Q909245 thumbnail Fire_breathing_2_Luc_Viatour.jpg?width=300.
- Q909245 wikiPageExternalLink research.htm.
- Q909245 wikiPageExternalLink lsp_overview.htm.
- Q909245 wikiPageWikiLink Q10800507.
- Q909245 wikiPageWikiLink Q124695.
- Q909245 wikiPageWikiLink Q133235.
- Q909245 wikiPageWikiLink Q163214.
- Q909245 wikiPageWikiLink Q187689.
- Q909245 wikiPageWikiLink Q190132.
- Q909245 wikiPageWikiLink Q212629.
- Q909245 wikiPageWikiLink Q221262.
- Q909245 wikiPageWikiLink Q23548.
- Q909245 wikiPageWikiLink Q235544.
- Q909245 wikiPageWikiLink Q42501.
- Q909245 wikiPageWikiLink Q4563566.
- Q909245 wikiPageWikiLink Q48655.
- Q909245 wikiPageWikiLink Q629.
- Q909245 wikiPageWikiLink Q6452502.
- Q909245 wikiPageWikiLink Q7115648.
- Q909245 wikiPageWikiLink Q79746.
- Q909245 wikiPageWikiLink Q8226663.
- Q909245 wikiPageWikiLink Q856548.
- Q909245 wikiPageWikiLink Q877096.
- Q909245 comment "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 there are some exceptions to the rule.".
- Q909245 label "Diffusion flame".
- Q909245 depiction Fire_breathing_2_Luc_Viatour.jpg.