Lewis number effects on the structure and extinction of diffusion flames due to strain

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.

Description

Title: Lewis number effects on the structure and extinction of diffusion flames due to strain
Author/s:
  • Liñán Martínez, Amable
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

Full text

[img]
Preview
PDF - Requires a PDF viewer, such as GSview, Xpdf or Adobe Acrobat Reader
Download (261kB) | Preview

Abstract

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.

More information

Item ID: 1254
DC Identifier: http://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
  • Logo InvestigaM (UPM)
  • Logo GEOUP4
  • Logo Open Access
  • Open Access
  • Logo Sherpa/Romeo
    Check whether the anglo-saxon journal in which you have published an article allows you to also publish it under open access.
  • Logo Dulcinea
    Check whether the spanish journal in which you have published an article allows you to also publish it under open access.
  • Logo de Recolecta
  • Logo del Observatorio I+D+i UPM
  • Logo de OpenCourseWare UPM