Thermal oscillations in liquids of low prandtl number

Spontaneous temperature oscillations have been found to occur in the melts from which metal and semiconductor crystals are grown when a minimum temperature gradient has been exceeded, causing impurity banding and undesirable properties. These oscillations are here studied in an annular bath using me...

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Bibliographic Details
Published in:Journal of crystal growth 1981-01, Vol.52 (1), p.459-464
Main Authors: Pamplin, B.R., Milsom, J.A.
Format: Article
Language:English
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Summary:Spontaneous temperature oscillations have been found to occur in the melts from which metal and semiconductor crystals are grown when a minimum temperature gradient has been exceeded, causing impurity banding and undesirable properties. These oscillations are here studied in an annular bath using mercury as the working fluid. The amplitude of the oscillations is found to reach a peak of about 1°C at certain aspect ratios, analogous to resonance. It is believed that these peaks are caused by the presence of two or four counter-rotating “rolls” of liquid. It is suggested that growers of crystals from the melt should pay attention to the geometry of their vessels as well as to temperature gradients.
ISSN:0022-0248
1873-5002
DOI:10.1016/0022-0248(81)90234-7