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Liñán Martínez, Amable (1981). Lewis number effects on the structure and extinction of diffusion flames due to strain. In: "Proceedings of the International Conference", 25-27 Jun 1980, Madrid, España. ISBN 3-540-10289-2.
Title: | Lewis number effects on the structure and extinction of diffusion flames due to strain |
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Author/s: |
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Item Type: | Presentation at Congress or Conference (Article) |
Event Title: | Proceedings of the International Conference |
Event Dates: | 25-27 Jun 1980 |
Event Location: | Madrid, España |
Title of Book: | The role of coherent structures in modelling turbulence and mixing |
Date: | 1981 |
ISBN: | 3-540-10289-2 |
Volume: | 136 |
Subjects: | |
Freetext Keywords: | Lewis number |
Faculty: | E.T.S.I. Aeronáuticos (UPM) |
Department: | Motopropulsión y Termofluidodinámica [hasta 2014] |
Creative Commons Licenses: | Recognition - No derivative works - Non commercial |
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In turbulent diffusion flames chemical reaction and mixing occur simultaneously in thin strained and distorted laminar mixing layers separating fuel from the oxidizer.
If the reaction can be modelled in terms of an irreversible reaction
F + n 02 —> Products
the relative importance of chemical production and transportation terms in the conservaron
equations is measured by the Damkohler number, or ratio of the character-istic mixing time tm and the characteristic chemical time tc. A typical mixing time is the inverse of the straining rate y, while tc~' is proportional to the frequency factor of the reaction times the Arrhenius exponential exp (-E/RT) involving the ratio of the activation energy of the reaction E to the thermal energy TR. Combustión
reactions are exothermic and with large valúes of the ratio E/RT, and, as a result we find in the flow-fiéld regions of low temperature, where the Damkohler number is very small and, therefore, the chemical reaction is frozen. These regions coexist with regions of high temperature where because the reaction is so fast, one of the reactants is depleted, so that either the local concentration of the fuel or of the oxidizer must be zero.
Item ID: | 1254 |
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DC Identifier: | https://oa.upm.es/1254/ |
OAI Identifier: | oai:oa.upm.es:1254 |
Official URL: | http://www.springerlink.com/content/k5041mp0l038/ |
Deposited by: | Biblioteca ETSI Aeronauticos |
Deposited on: | 09 Dec 2008 |
Last Modified: | 20 Apr 2016 06:45 |