Volatization & combustion of biomass particles in random media: Mathematical modeling and analyze the effect of Lewis number

Abstract

In this work, a mathematical model is proposed to model volatilization and combustion of micro organic dust particles. In contrast with previous studies, random combustion of Biomass particles (Lycopodium) and analyze the effect of different Lewis number on the combustion properties is investigated. It is assumed that flame structure is consisted of preheat or volatilization zone, reaction zone and post flame zone. Also, different Lewis numbers are applied in governing equations. For modeling random combustion, the source term in energy equation has been modeled by use of random states for volatilization of particles in preheat zone. For this regard, different groups which contains random number 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 size of particles on the combustion properties of Biomass 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, showed that the random model have a better agreement with experimental data than non-random model.