Existence conditions and drift velocities of adiabatic flame-balls in weak gravity fields

Joulin, G and Kurdyumov, V. and Liñán Martínez, Amable (1999). Existence conditions and drift velocities of adiabatic flame-balls in weak gravity fields. "Combustion Theory and Modelling", v. 3 ; pp. 281-296. ISSN 1364-7830.

Description

Title: Existence conditions and drift velocities of adiabatic flame-balls in weak gravity fields
Author/s:
  • Joulin, G
  • Kurdyumov, V.
  • Liñán Martínez, Amable
Item Type: Article
Título de Revista/Publicación: Combustion Theory and Modelling
Date: 1999
ISSN: 1364-7830
Volume: 3
Subjects:
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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Abstract

Combining activation energy asymptotics, suitable scalings and numerical methods, we study how flame-balls move under the action of the free convection that they themselves generate in the presence of a weak, uniform gravity field. Attention is focused on steady configurations (in a suitable reference frame), on an isolated flame-ball of size comparable to what is obtained in the absence of gravity, and on deficient reactants that are characterized by a low Lewis number. For the sake of simplicity, we consider an adiabatic combustion process, in the sense that the radiative exchanges are neglected. This work provides one with: (a) a description of the free-convection field around the flame-ball, along with an asymptotic estimate of the drift velocity; (b) a relationship between the flame-ball radius, strength of gravity and physico-chemical properties of the reactive premixture; (c) extinction conditions, caused by the net effect of heat extraction from the flame-ball to its surroundings by the free-convection field. Hints on generalizations currently under consideration are also given.

More information

Item ID: 1307
DC Identifier: http://oa.upm.es/1307/
OAI Identifier: oai:oa.upm.es:1307
Official URL: http://www.tandf.co.uk/journals/titles/13647830.asp
Deposited by: Biblioteca ETSI Aeronauticos
Deposited on: 18 Jan 2009
Last Modified: 20 Apr 2016 06:46
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