1990 Fiscal Year Final Research Report Summary
The Study for the Improvement of Crystallization Process
| Project/Area Number |
01850050
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Research Field |
Thermal engineering
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| Research Institution | Institute of Advanced Material study, Kyushu University |
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Principal Investigator |
OZOE Hiroyuki Kyushu Univ., IAMS, Professor, 機能物質科学研究所, 教授 (10033242)
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| Co-Investigator(Kenkyū-buntansha) |
KOTAKE Susumu Tokyo Univ., Fac. of Eng., Professor, 工学部, 教授 (30013642)
FUJII Tetsu Kyushu Univ., IAMS, Professor, 教授 (20038574)
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| Project Period (FY) |
1989 – 1990
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| Keywords | Crystallization / Thermal process / Liquid crystal / Magnetic field / Natural convection / Hartmann number / Czochralski method |
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| Research Abstract |
In a Czochralski crystallization process, the melt convection has been known to affect the quality of a crystal rod produced. This project aims to clarify transport processes in this system. The flow modes of Czochralski convection was visualized with liquid crystal powder in silicone oil in a cylindrical enclosure heated from surroundings and cooled from a rotating cylinder located on the surface of silicone oil. Two fluctuating flow modes were found to prevail depending on Gr/Re^2. One mode gives downward flow and another one upward flow in a central core of a cylindrical enclosure. In the theoretical analysis, quasi three-dimensional mixed convection with an axial or lateral directional magnetic field was modeled and solved numerically and clarified the effect of external force fields. With a miniature crystallization experimental apparatus, metallic tin (Sn) was melted and solidified in a long rod successfully after many trials.
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