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Simulation and experimental study of spray pyrolysis of polydispersed droplets

Published online by Cambridge University Press:  31 January 2011

W. Widiyastuti ,
Wei-Ning Wang ,
I. Wuled Lenggoro ,
Ferry Iskandar  and
Kikuo Okuyama
W. Widiyastuti
Affiliation:
Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
Wei-Ning Wang
Affiliation:
Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
I. Wuled Lenggoro
Affiliation:
Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan
Ferry Iskandar
Affiliation:
Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
Kikuo Okuyama*
Affiliation:
Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
*
a)Address all correspondence to this author. e-mail: okuyama@hiroshima-u.ac.jp
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Abstract

The size distribution and morphology of particles (dense or hollow) produced from polydispersed droplets in spray pyrolysis were studied both experimentally and theoretically. Zirconia, generated from a zirconyl hydroxychloride precursor, was selected as a model material. The simulation method that was previously developed by our group [J. Mater. Res., 15, 733 (2000)], in which droplets were assumed to be uniform, was improved to evaluate the effect of polydispersity in droplets on the size and morphology of the resulting particles. Simultaneous equations for heat and mass transfer of solvent evaporation and solute mass transfer inside droplets were solved numerically for a number of discrete classes of droplet size distribution. The role of the decomposition reaction was also included after the evaporation stage of polydispersed droplets in an attempt to explain the densification of particles. In hollow particle generation, this simulation was used to evaluate the thickness of a particle shell. The experimental results were in good agreement with the simulation data, suggesting that the model provides a more realistic prediction.

Keywords

Chemical reactionDensificationSpray pyrolysis
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 7 , July 2007 , pp. 1888 - 1898
Copyright
Copyright © Materials Research Society 2007

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References

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