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A Theoretical Study of Combustion of Nonspherical Particles

Choi, Moon Kyu and Gavalas, George R. (1993) A Theoretical Study of Combustion of Nonspherical Particles. Combustion Science and Technology, 89 (1-4). pp. 9-26. ISSN 0010-2202.

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A theoretical study is carried out of the combustion of nonspherical carbonaceous particles in the regime of shrinking core reaction. The first problem addressed is the calculation of the pseudosteady temperature and oxidation rate for a particle of given shape. This problem involves the solution of the external diffusion and heat conduction equations with the reaction entering as a boundary condition over the particle surface. Using the boundary integral method, the problem is reformulated as a system of two coupled integral equations which are solved numerically by suitable discretization. The complete transient problem addressing the evolution of particle shape and particle temperature during burnout is similarly formulated by the boundary integral method and solved numerically. Over a broad range of parameters, the pseudosteady particle temperature and rate of oxidation are very nearly equal to those of spherical particles of equal volume and surface area respectively. The transient solutions obtained for parameters typical of pulverized combustion show that during burnout the particle becomes increasingly nonspherical. As expected, nonspherical particles burn faster than spherical particles of the same initial volume, but the difference in burnout times is less than 20% for initial aspect ratios between one and three.

Item Type:Article
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Gavalas, George R.0000-0003-1468-6835
Additional Information:© 1993 Gordon & Breach. (Received December 2, 1992; in final form June 8, 1992) This work was supported by the Department of Energy, University Coal Research Program under grant DE-FG-22-88PC88911.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG-22-88PC88911
Issue or Number:1-4
Record Number:CaltechAUTHORS:20151007-090428510
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60853
Deposited By: George Porter
Deposited On:07 Oct 2015 17:35
Last Modified:03 Oct 2019 09:01

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