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Computation, Visualization, and Chemistry of Electric Field-Enhanced Production of Ceramic Precursor Powders

Published online by Cambridge University Press:  25 February 2011

Michael T. Harris ,
Warren G. Sisson  and
Osman A. Basaran
Michael T. Harris
Affiliation:
Chemical Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
Warren G. Sisson
Affiliation:
Chemical Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
Osman A. Basaran
Affiliation:
Chemical Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
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Abstract

The stability of a liquid emanating from a nozzle is profoundly affected by an electric field. This electric-field induced instability is used here to form ceramic precursor powders having well-controlled particle-size distribution and morphology. Moreover, a hybrid boundary element/finite element method is used to determine the shapes and stability of a drop hanging from a nozzle. The efficiency of two different electrode configurations is considered: in one configuration, the nozzle is attached to the top plate of a parallel-plate capacitor and in the other, the nozzle is surrounded by a concentric cylindrical electrode. The computational results show that such pendant drops lose stability at turning points with respect to field strength. The experimental and computational results reported here are of importance not only in the development of electrodispersion apparatus, but in fields as diverse as capillarity and separations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 271: Symposium N – Better Ceramics Through Chemistry V , 1992 , 945
Copyright
Copyright © Materials Research Society 1992

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References

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