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In this paper, a new analytical model is proposed to model combustion of micro organic dust particles. In contrast with previous studies, random combustion of lycopodium particles and analyze the effect of heat loss and different Lewis number on the combustion properties is taken which has not be considered before this. It is assumed that flame structure is consisted of a preheat-vaporization zone, a reaction zone and a post flame zone. Then, different Lewis numbers are applied in governing equations. To perform the random model of particle combustion, source term in energy equation has been modeled by means of random states for volatilization of particles in preheat zone. Therefore, different groups which contains random amount of particles and sense a random temperature in the preheat zone has been considered. In this analysis, the impact of random combustion, Lewis number, and particles diameter on the combustion properties of lycopodium particles such as burning velocity, flame temperature and effective equivalence ratio are studied. Consequently, comparison made between results obtained from random model by experimental data, indicated that the random model have a better agreement with experimental data than non-random model.
PAPER REVISED: 2018-03-16
PAPER ACCEPTED: 2018-03-27
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THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE Issue 5, PAGES [3175 - 3186]
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