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ISSN Online: 2377-424X

ISBN Print: 0-85295-345-3

International Heat Transfer Conference 10
August, 14-18, 1994, Brighton, UK

INDUCED IGNITION OF COMBUSTIBLE GASES DUE TO ABSORPTION OF RADIATION BY SMALL PARTICLES

Get access (open in a dialog) DOI: 10.1615/IHTC10.4860
pages 1-6

Resumo

The indirect thermal ignition of combustible gases by inert particles in a one-dimensional slab geometry is investigated. Though the methane/air mixture is assumed to be transparent to radiation, the inert aluminum oxide particles are considered to actively absorb and emit the radiation. The problem is formulated based on a standard two-flux radiation model. The numerical results show that the methane/air mixture is easily ignited within 1 second due to indirect heating of the aluminum oxide particles by absorbing radiation, if the temperature of the external black-body radiative heat source is well over 2000 K. A decrease in the particle size at a fixed particle number density exerts a strong influence on extending the ignition delays on account of the reduced extinction coefficient.