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Critical conditions for carbon combustion
Treviño, César and Higuera Antón, Francisco and Liñán Martínez, Amable
Critical conditions for carbon combustion.
In: "21st Symposium (International) on Combustion", 3-8 Ago 1986, West Germany. ISBN 0008207843.
||Critical conditions for carbon combustion
Higuera Antón, Francisco
Liñán Martínez, Amable
Presentation at Congress or Conference
||21st Symposium (International) on Combustion
||3-8 Ago 1986
|Title of Book:
||Twenty-first Symposium (International) on Combustion
||E.T.S.I. Aeronáuticos (UPM)
||Motopropulsión y Termofluidodinámica [hasta 2014]
|Creative Commons Licenses:
||Recognition - No derivative works - Non commercial
The critical conditions for vigorous burning of spherical carbón partióles are derived using
asymptotic techniques for large Zel'dovich numbers. The particle liíetime and the temperature
history are obtained for both supercritical and subcritical regimes, when a carbón particle is
suddenly exposed to a stagnant high temperature oxidizing atmosphere. For Damkóhler numbers
below a critical number, that is, the subcritical regime, slow burning oceurs in the carbón
particle. That means that throughout the life of the particle, the chemical reaction is controlled
by kinetics. In this regime, the lifetime is extremely long. On the other hand, for Damkóhler
numbers above the critical one, the process ends with a rapid increase of temperature finally
reaching a reaction controlled by diffusion. In this supercritical regime, the life is relativelv
short. For valúes of the reduced Damkóhler number very cióse to the critical one, a Ricatti
equadon is derived for the non-dimensional temperature of the particle, the solution of which
defines whether the particle undergoes subcritical or supercritical behavior.
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