Experimental and computational study of flow instabilities in a model of Czochralski growth

Maxim Teitel; Dietrich Schwabe; Alexander Yu Gelfgat

doi:10.1016/j.jcrysgro.2007.11.164

Experimental and computational study of flow instabilities in a model of Czochralski growth

Maxim Teitel, Dietrich Schwabe, Alexander Yu Gelfgat^*

^*Corresponding author for this work

School of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

50 Scopus citations

Abstract

The results of experimental modeling of Czochralski flow of large-Prandtl-number oxide melts are reported. An instability mechanism resulting in cold plumes detaching from the cold crystal and then descending towards the crucible bottom is observed. With the increase of the temperature difference or crystal rotation the baroclinic instability mechanism, characterized by three-dimensional oscillations of a cold jet descending along the symmetry axis, becomes dominant. The experiments are carried out for different silicone oils characterized by different Prandtl numbers and for varying crystal/crucible radii ratio. Results of computational modeling results qualitatively agree with the experimental observations. Possible reasons for the quantitative disagreement are discussed.

Original language	English
Pages (from-to)	1343-1348
Number of pages	6
Journal	Journal of Crystal Growth
Volume	310
Issue number	7-9
DOIs	https://doi.org/10.1016/j.jcrysgro.2007.11.164
State	Published - Apr 2008

Keywords

A1. Convection
A1. Fluid flows
A1. Heat transfer
A2. Czochralski method

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10.1016/j.jcrysgro.2007.11.164

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title = "Experimental and computational study of flow instabilities in a model of Czochralski growth",

abstract = "The results of experimental modeling of Czochralski flow of large-Prandtl-number oxide melts are reported. An instability mechanism resulting in cold plumes detaching from the cold crystal and then descending towards the crucible bottom is observed. With the increase of the temperature difference or crystal rotation the baroclinic instability mechanism, characterized by three-dimensional oscillations of a cold jet descending along the symmetry axis, becomes dominant. The experiments are carried out for different silicone oils characterized by different Prandtl numbers and for varying crystal/crucible radii ratio. Results of computational modeling results qualitatively agree with the experimental observations. Possible reasons for the quantitative disagreement are discussed.",

keywords = "A1. Convection, A1. Fluid flows, A1. Heat transfer, A2. Czochralski method",

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T1 - Experimental and computational study of flow instabilities in a model of Czochralski growth

AU - Teitel, Maxim

AU - Schwabe, Dietrich

AU - Gelfgat, Alexander Yu

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N2 - The results of experimental modeling of Czochralski flow of large-Prandtl-number oxide melts are reported. An instability mechanism resulting in cold plumes detaching from the cold crystal and then descending towards the crucible bottom is observed. With the increase of the temperature difference or crystal rotation the baroclinic instability mechanism, characterized by three-dimensional oscillations of a cold jet descending along the symmetry axis, becomes dominant. The experiments are carried out for different silicone oils characterized by different Prandtl numbers and for varying crystal/crucible radii ratio. Results of computational modeling results qualitatively agree with the experimental observations. Possible reasons for the quantitative disagreement are discussed.

AB - The results of experimental modeling of Czochralski flow of large-Prandtl-number oxide melts are reported. An instability mechanism resulting in cold plumes detaching from the cold crystal and then descending towards the crucible bottom is observed. With the increase of the temperature difference or crystal rotation the baroclinic instability mechanism, characterized by three-dimensional oscillations of a cold jet descending along the symmetry axis, becomes dominant. The experiments are carried out for different silicone oils characterized by different Prandtl numbers and for varying crystal/crucible radii ratio. Results of computational modeling results qualitatively agree with the experimental observations. Possible reasons for the quantitative disagreement are discussed.

KW - A1. Convection

KW - A1. Fluid flows

KW - A1. Heat transfer

KW - A2. Czochralski method

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JO - Journal of Crystal Growth

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IS - 7-9

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Experimental and computational study of flow instabilities in a model of Czochralski growth

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