NJIT eTD::njit-etd2004-003::Eapen, Binu Zacharia::"Combustion of aerosolized spherical aluminum powders and flakes in air"

Combustion rates and completeness of aerosolized spherical aluminum powders and flakes are compared using constant volume explosion experiments. The comparison of particles and flake sizes was made based on their specific surface areas determined using the Brunauer-Emmett-Teller (BET) method and respective "BET diameters". It is observed that the rates of pressure rise and rates of flame propagation were higher for aluminum powders with BET diameters of about 2 to 5 μm compared to aluminum flakes for which the BET diameters were under 1 μm In agreement with the flame propagation rates, the overall completeness of combustion was also higher for aluminum powders compared to flakes. It is suggested that aerosolized flakes could be agglomerated in gas flows more than spherical particles causing their inferior combustion performance.

Title:	Combustion of aerosolized spherical aluminum powders and flakes in air
Author:	Eapen, Binu Zacharia
Document Type:	Thesis
Department:	Department of Mechanical Engineering
Degree:	Master of Science
Major:	Mechanical Engineering
Advisory Committee:	Dreizin, Edward L. Zhu, Chao Khusid, Boris
Thesis Date:	2004, January
Keywords:	Combustion Aerosolized sherical aluminum powders and flakes
Availability:	Unrestricted
Abstract:	Combustion rates and completeness of aerosolized spherical aluminum powders and flakes are compared using constant volume explosion experiments. The comparison of particles and flake sizes was made based on their specific surface areas determined using the Brunauer-Emmett-Teller (BET) method and respective "BET diameters". It is observed that the rates of pressure rise and rates of flame propagation were higher for aluminum powders with BET diameters of about 2 to 5 μm compared to aluminum flakes for which the BET diameters were under 1 μm In agreement with the flame propagation rates, the overall completeness of combustion was also higher for aluminum powders compared to flakes. It is suggested that aerosolized flakes could be agglomerated in gas flows more than spherical particles causing their inferior combustion performance.
Complete Thesis:	njit-etd2004-003 (55 pages ~ 3,698 KB pdf)
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