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Effect of magnetic and electrical fields on dendritic freezing of aqueous solutions of sodium chloride

Rohatgi, PK and Jain, SM and Adams, CM (1974) Effect of magnetic and electrical fields on dendritic freezing of aqueous solutions of sodium chloride. In: Materials Science and Engineering, 15 (2-3). pp. 283-290.

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Official URL: http://dx.doi.org/10.1016/0025-5416(74)90062-7

Abstract

Aqueous solutions of sodium chloride were solidified under the influence of magnetic and electrical fields using two different freezing systems. In the droplet system, small droplets of the solution are introduced in an organic liquid column at −20°C which acts as the heat sink. In the unidirectional freezing system the solutions are poured into a tygon tube mounted on a copper chill, maintained at −70°C, from which the freezing initiates. Application of magnetic fields caused an increase in the spacing and promoted side branching of primary ice dendrites in the droplet freezing system, but had no measurable effect on the dendrites formed in the unidirectional freezing system. The range of electric fields applied in this investigation had no measurable effect on the dendritic structure. Possible interactions between external magnetic and electrical fields have been reviewed and it is suggested that the selective effect of magnetic fields on dendrite spacings in a droplet system could be due to a change in the nucleation behaviour of the solution in the presence of a magnetic field.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 19 Dec 2009 07:45
Last Modified: 24 Feb 2012 10:05
URI: http://eprints.iisc.ernet.in/id/eprint/23293

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