Effect of Thermal Resistance on the Random Combustion of Micro-Organic Dust Particles
Publication: Journal of Energy Engineering
Volume 144, Issue 1
Abstract
A new mathematical model is presented to investigate the random combustion of a combustible mixture of micro-organic dust particles and air. For this purpose, a model is developed assuming a flame structure composed of three zones: a broad preheat zone, a reaction zone, and a postflame zone. The random modeling of the combustion process is brought about by adding a source term in the energy equation indicating the random states of particle volatilization in the preheat zone. The effect of thermal resistance on the combustion characteristics, such as flame temperature and burning velocity, is studied using a nonzero Biot number in the model. Moreover, it is observed that particle size considerably impacts the flame propagation through organic dust particles. As a result, it is concluded that the increase in Biot number leads to a decrease in the burning velocity as well as flame temperature. The novelty of this research is the improved understanding of the random distribution of the combustion phenomenon, which leads to more realistic and reasonable predictions of the combustion physics compared to the previously published analytical and experimental results.
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Published In
Journal of Energy Engineering
Volume 144 • Issue 1 • February 2018
Copyright
©2017 American Society of Civil Engineers.
History
Received: Dec 15, 2016
Accepted: Jul 13, 2017
Published online: Nov 23, 2017
Published in print: Feb 1, 2018
Discussion open until: Apr 23, 2018
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