Transition flow modes in Czochralski convection

Jung Il Choi; Seungtae Kim; Hyung Jin Sung; Akifumi Nakano; Hide S. Koyama

doi:10.1016/S0022-0248(97)00212-1

Transition flow modes in Czochralski convection

Jung Il Choi, Seungtae Kim, Hyung Jin Sung, Akifumi Nakano, Hide S. Koyama

Department of Computational Science and Engineering

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

15 Citations (Scopus)

Abstract

A laboratory experiment of critical transition flow modes in Czochralski convection was performed. Numerical computation was also made to delineate the dynamic transition mechanism of flow modes. The period of temperature oscillation (t_p) and the interval of temperature oscillation (Δθ) were scrutinized to capture the critical transition regime. The mixed convection parameter was varied in a range 0.134 ≤ Ra/PrRe² ≤ 3.804. The computed results were shown to be in good agreement with the experimental data. The influence of the Prandtl number on the transition was examined for Pr = 910, 4445 and 8889. To understand the transition mechanism, the detailed temperature oscillation modes, the isolines of meridional temperature and the axial velocity profiles were investigated. The effect of the rotations of crucible on the transient flow modes were also examined.

Original language	English
Pages (from-to)	305-314
Number of pages	10
Journal	Journal of Crystal Growth
Volume	180
Issue number	2
DOIs	https://doi.org/10.1016/S0022-0248(97)00212-1
Publication status	Published - 1997 Sep

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Inorganic Chemistry
Materials Chemistry

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abstract = "A laboratory experiment of critical transition flow modes in Czochralski convection was performed. Numerical computation was also made to delineate the dynamic transition mechanism of flow modes. The period of temperature oscillation (tp) and the interval of temperature oscillation (Δθ) were scrutinized to capture the critical transition regime. The mixed convection parameter was varied in a range 0.134 ≤ Ra/PrRe2 ≤ 3.804. The computed results were shown to be in good agreement with the experimental data. The influence of the Prandtl number on the transition was examined for Pr = 910, 4445 and 8889. To understand the transition mechanism, the detailed temperature oscillation modes, the isolines of meridional temperature and the axial velocity profiles were investigated. The effect of the rotations of crucible on the transient flow modes were also examined.",

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AU - Choi, Jung Il

AU - Kim, Seungtae

AU - Sung, Hyung Jin

AU - Nakano, Akifumi

AU - Koyama, Hide S.

PY - 1997/9

Y1 - 1997/9

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Transition flow modes in Czochralski convection

Abstract

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