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Models of Crystallisation in Evaporating Droplets

Published online by Cambridge University Press:  21 February 2011

I.J. Ford
I.J. Ford*
Affiliation:
Department of Materials, University of Oxford, Parks Road, Oxford, 0X1 3PH, U.K.
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Abstract

The spray drying of a droplet containing a substance in solution can produce solid particles with a variety of final shapes: hollow, punctured, squashed, as well as solid spheres. The geometry affects the properties of the product. Models are presented here which describe the processes of solvent evaporation and solute crystallisation as drying takes place. The formation of a crust on the surface of the droplet is addressed. It is proposed that such a crust with a thickness of two crystallite diameters can develop into dry hollow shell. Some example calculations of the spray drying of droplets of sodium chloride solution are described.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 398: Symposium C – Thermodynamics and Kinetics of Phase Transformations , 1995 , 637
Copyright
Copyright © Materials Research Society 1998

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References

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