Numerical computation for the secondary convection in a czochralski crystal growing system with a rotating crucible and a static crystal rod

Masato Akamatsu, Koichi Kakimoto, Hiroyuki Ozoe

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Transient three-dimensional numerical computations were carried out for the melt flow in a Czochralski system with radiative cooling from the surface of the melt. The conditions of the present calculation are Ra = 104, Pr = 0.016, Recry = 0, Recru = 0, -100 and -150. Asymmetric temperature profiles were obtained even for natural convection under symmetric boundary conditions with oscillatory convection. The oscillation period increased when crucible rotation rate was increased, while an amplitude was decreased. These oscillations of temperature and velocity accompanied the rotation of roll cells in a circumferential direction.

Original languageEnglish
Pages (from-to)329-348
Number of pages20
JournalJournal of Materials Processing and Manufacturing Science
Volume5
Issue number4
Publication statusPublished - 1997

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Crucibles
Crystal growth
Crystals
Natural convection
Boundary conditions
Cooling
Temperature
Convection
Direction compound

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

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abstract = "Transient three-dimensional numerical computations were carried out for the melt flow in a Czochralski system with radiative cooling from the surface of the melt. The conditions of the present calculation are Ra = 104, Pr = 0.016, Recry = 0, Recru = 0, -100 and -150. Asymmetric temperature profiles were obtained even for natural convection under symmetric boundary conditions with oscillatory convection. The oscillation period increased when crucible rotation rate was increased, while an amplitude was decreased. These oscillations of temperature and velocity accompanied the rotation of roll cells in a circumferential direction.",
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AU - Kakimoto, Koichi

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AB - Transient three-dimensional numerical computations were carried out for the melt flow in a Czochralski system with radiative cooling from the surface of the melt. The conditions of the present calculation are Ra = 104, Pr = 0.016, Recry = 0, Recru = 0, -100 and -150. Asymmetric temperature profiles were obtained even for natural convection under symmetric boundary conditions with oscillatory convection. The oscillation period increased when crucible rotation rate was increased, while an amplitude was decreased. These oscillations of temperature and velocity accompanied the rotation of roll cells in a circumferential direction.

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