Abstract
This paper presents an experimental methodology, respective heat transfer model, and initial results describing ignition of rapidly heated, aerosolized powders of different materials. The experimental setup uses a CO2 laser as a heat source. The interaction of the laser beam with particles is particle size-dependent and only a narrow range of particle sizes is heated effectively. Therefore, the heat transfer model needs to be only analyzed for the particles with this specific size, which greatly simplifies the interpretation of experiments. The powder is aerosolized inside a plate capacitor by charging particles contacting the capacitor’s electrodes. A thin, laminar aerosol jet is carried out by an oxidizing gas through a small opening in the top electrode and is fed into a laser beam. The velocities of particles in the jet are about 1 m/s. The laser power is increased until the particles are observed to ignite. The ignition is detected optically. The ignition thresholds for spherical magnesium and aluminum powders were measured. The experimental data for magnesium, for which ignition kinetics is well known, were used to calibrate the detailed heat transfer model. The model was used to evaluate the ignition kinetics for aluminum powder.
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References
Rogers, R.N., Thermochimica Acta 11 (2), pp. 131–139 (1975).
Pickard, J.M., “Thermochimica Acta, 392–393, pp. 37–40 (2002).
Annamalai, K., Durbetaki, P. Combustion and Flame 29 (2) pp. 193–208 (1977).
Almada, S., Campos, J., Gois, J. C. Proceedings of the 24th International Pyrotechnics Seminar, pp. 827–831 (1998).
Trunov, M.A., Schoenitz, M., Dreizin, E.L., Propellants Explosives and Pyrotechnics, 40 (1) pp. 36–43 (2005).
Dreizin, E. L., Hoffmann V. K. Combustion and Flame, 118 (1–2) pp. 262–280 (1999).
Fedorov, A. V., Gosteev, Y. Archivum Combustionis, 16 (3–4) pp 137–152 (1998).
Ward, T.S., “Heat Transfer Model for Ignition of Metal Powder on a heated Filament” A Thesis Submitted to the Faculty of New Jersey Institute of Technology in Partial Fulfillment of the Requirements for the Degree of Master of Science in Mechanical Engineering, Newark, NJ, May 2005.
Shoshin Y., Dreizin, E., Aerosol Science and Technology 36 (9) pp. 953–962 (2002).
Holman J. P., Heat Transfer, McGraw-Hill, New York, 1981.
Bhormen C. F., Huffman D. R. Absorption and Scattering of Light by Small Particles, Wiley, New York, 1983.
Qiu, T. Q.; Longtin, J. P.; Tien, C. L. Journal of Heat Transfer 117 (2) pp. 340–345 (1995).
Palik E.D. Handbook of Optical Constants of Solids III, Academic, New York (1998).
Lide, D.L., Handbook of Chemistry and Physics, CRC, New York, 2003–2004.
Yilbas, B.S. International Journal of Heat and Mass Transfer 40 (5) pp 1131–1143 (1997).
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Mohan, S., Shoshin, Y. & Dreizin, E. Ignition of Aerosolized Reactive Particles at High Heating Rates. MRS Online Proceedings Library 896, 403 (2005). https://doi.org/10.1557/PROC-0896-H04-03
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DOI: https://doi.org/10.1557/PROC-0896-H04-03