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1989 Fiscal Year Final Research Report Summary

The effect of Ultrasonic Wave on Czochralski Process for Growing Single Crystal

Research Project

Project/Area Number 63550489
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 金属精錬・金属化学
Research InstitutionNagoya University

Principal Investigator

KUWABARA Mamoru  Nagoya Univ., Faculty of Eng. Research Associate, 工学部, 助手 (70023273)

Co-Investigator(Kenkyū-buntansha) ASAI Shigeo  Nagoya Univ., Faculty of Eng. Professor, 工学部, 教授 (80023274)
Project Period (FY) 1988 – 1989
KeywordsCzochralski Method / Single Crystal / Unidirectional Solidification / Ultrasonic Wave / Natural Convection / Double Diffusive Phenomena / Flow Visualization
Research Abstract

This study originally proposes a new Czoehralski process with radiating ultrasonic wave into liquid bath from which single crystal grows. This new method effectively utilizes ultrasonic standing wave established in the bath mainly so as to suppress thermal and solutal fluctuation induced by natural convection as well as to grow large crystal under suppressed supercooling of melt. Concluding remarks are as follows: 1. Flow regimes of natural convection in melt are classified and illustrated on a diagram as is specified by an interrelation between thermal and solutal Rayleigh numbers. 2. A resonant liquid depth exists at every depth equal to half of the wave length. 3. Degassed melt should be utilized in this process so as to suppress cavitation phenomena which interfere effective control of fluid convection. 4. The effect of ultrasonic wave on natural convection in degassed water is investigated on the basis of both the flow field visualized by a shadowgraph method and the sonic field d … More etected by an ultrasonic meter. Ultrasonic wave constrained a heated part of fluid at a sonic node whereas a cooled one at a sonic loop. The direction of force induced in water coincides with that of the radiation pressure acting on a hypothetically submerged fluid particle which has different acoustic properties from surrounding bulk depending on different density and different sonic velocity. 5. At increased density of ultrasonic energy, flow pattern visualized by the aluminum tracer method indicated that a stagnant area, in which moderate circulation of fluid occurs was formed nearby a sonic loop even at a uniform temperature field. This area is considered to be resulted from periodically distributed radiation pressure in fluid. 6. Using a simulated CZ device, the effect of ultrasonic wave on forced convection, natural convection and mixed convection in water has been investigated. At low density of ultrasonic energy, ultrasonic wave stabilizes the convection field whereas a stagnant area which emerges in increased energy case considerably changes even the flow field including forced convection. Less

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 奥村圭二: "垂直一方向凝固における熱溶質対流の理論解析と模型実験" 鉄と鋼. 75. 618-625 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 桑原守: "液中における熱対流の超音波による抑制" 鉄と鋼. (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 尾崎幸克: "液中における熱対流の超音波による抑制" 材料とプロセス. 2. 274-274 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 尾崎幸克: "超音波による液中熱対流の制御" 材料とプロセス. 3. 131-131 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 奥村圭二: "垂直一方向凝固時における熱溶質対流の数値解析" 第2回計算力学講演会講演概要集. 9-10 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Keiji Okumura: "Numerical Analysis and Model Experiment on Thermosolutal Convection during Unidirectional Solidification in the Vertical Direction" Tetsu-to-Hagane, 75, p.618, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Keiji Okumura: "Theoretical Analysis on Thermosolutal Convection during Unidirectional Solidification in the Vertical Direction" 2nd Sympo. on Computational Dynamics, p.9, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yukikatsu Ozaki: "Suppression of Thermal Convection in Liquid by Ultrasonic Wave" CAMP-ISIJ, 2, p.274, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yukikatsu Ozaki: "Control of Thermal Convection in Liquid by Ultrasonic Wave" CAMP-ISIJ, 3, p.131, 1990.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Mamoru Kuwabara: "Suppression of Thermal Convection in Liquid by Ultrasonic Wave" Tetsu-to-Hagane.

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-03-26  

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