Konferenzpaper

Jahr der Veröffentlichung: 2002

Seiten: 1849-1853

Zeitschrift: Journal of Crystal Growth

Bandnummer: 237

ISSN: 0022-0248

DOI Link: https://doi.org/10.1016/S0022-0248(01)02201-1

Konferenz: 13th International Conference on Crystal Growth held in conjunction with the 11th International Conference on Vapor Growth and Epitaxy

Verlag: Elsevier

Abstract: 
We report on convection experiments with a fluid with Prandtl number Pr = 7 in a Czochralski model system and in annular gaps at normal gravity (1 - g) and under microgravity (mu - g). The results are applicable to oxide and fluoride melts. Thermocapillary flow penetrates fully into the fluid volume under microgravity whereas it separates into a layer-like flow on top of the liquid at normal gravity. This surface tension gradient-driven flow becomes unstable under microgravity and under normal gravity. By frequency analysis we can assign a hydrothermal wave-like structure to this instability for shallow liquid layers under microgravity and for all liquid heights h under normal gravity. The critical temperature differences DeltaT(c) for the onset of the oscillation are independent of h in all cases. Because of the separation mechanism the oscillation period is independent of h under 1 - g and comparable in the annular gap and in the Czochralski system. (C) 2002 Elsevier Science B.V. All rights reserved.

Harvard-Zitierstil: Schwabe, D. (2002) Buoyant-thermocapillary and pure thermocapillary convective instabilities in Czochralski systems, Journal of Crystal Growth, 237, Article PII S0022-0248(01)02201-1, pp. 1849-1853. https://doi.org/10.1016/S0022-0248(01)02201-1

APA-Zitierstil: Schwabe, D. (2002). Buoyant-thermocapillary and pure thermocapillary convective instabilities in Czochralski systems. Journal of Crystal Growth. 237, Article PII S0022-0248(01)02201-1, 1849-1853. https://doi.org/10.1016/S0022-0248(01)02201-1