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Melting and solidification of a metal surface subjected to a rapid high heat load

Research Project

Project/Area Number 01460121
Research Category

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

Allocation TypeSingle-year Grants
Research Field Thermal engineering
Research InstitutionScience University of Tokyo

Principal Investigator

KAWAMURA Hiroshi  Science University of Tokyo, Dept., Sci. and Tech., Professor, 理工学部, 教授 (80204783)

Co-Investigator(Kenkyū-buntansha) SEKI Masahiro  Japan Atomic Energy Research Institute, Planning Office of Fusion Reactor, Head, 核融合計画室, 室長
INAGAKI Eiichi  Science University of Tokyo, Dept., Sci. and Tech., Assistant, 理工学部, 助手 (70112894)
関 昌弘  日本原子力研究所, 核融合計画室, 室長
Project Period (FY) 1989 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥6,300,000 (Direct Cost: ¥6,300,000)
Fiscal Year 1991: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1990: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1989: ¥3,500,000 (Direct Cost: ¥3,500,000)
KeywordsThermocapillary flow / Melting / Surface deflection / Numerical analysis / Boundary coordinate / Parallel computation / Transputer / トランスピュ-タ / 第一壁溶融・再凝固 / 金属表面変形 / 並列演算効率 / プラズマ・ディスラプション / 再凝固層表面形状 / 表面張力 / マランゴニ対流 / 高熱負荷急加熱
Research Abstract

A first wall of a thermonuclear fusion reactor is exposed to a high heat load in case of a plasma disruption ; then melting, evaporation and resolidification of the first wall surface are anticipated. This would cause a serious problem for estimation of the first wall life. The present study aims to investigate experimentally and numerically the melting behavior of a metal surface subjected to a rapid high heat load. Especially, a numerical method was developed to simulate the melting and the resultant thermocapillary flow. In a simulation experiment, a thin film of a low-melting-point metal was exposed to one-sided heating of an infrared lump. The melting and thermocapillary flow were observed, and the movement of the melt layer resulted in a wavy resolidified surface.
Intensive heating experiments were performed by one of the present investigators using the hydrogen ion beam at Japan Atomic Research Institute. Two distinguished features were observed on the metal surface after the resolidification. One was the smooth surface with a surrounding ring hedge and the other was a rough surface with distributed wavy bumps.
In the numerical analysis, thermocapillary flow of the melt layer was calculated with the surface deformation taken into consideration. The calculation was made using the boundary fit coordinate method. The deflection of the free surface was calculated successfully for various head inputs and depth-width ratios.
The results indicated that the surface deformation was more prominent for the smaller depth-width ratio and the larger heat input. The effect of the sign of the surface tension temperature coefficient was investigated and found to have a considerable influence on the surface deformation.
To perform an efficient numerical calculation, the parallel computation using a transputer array was attempted. The efficiency of the parallelism was examined and an high efficiency was attained by optimizing the communication order.

Report

(4 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • 1989 Annual Research Report

Research Products

(19 results)

All Other

All Publications (19 results)

  • [Publications] 河村 洋: "トランスピュ-タを用いた熱流体数値解析の並列演算" 日本機械学会論文集(B編). 57. 222-227 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 稲垣 詠一: "ポアソン方程式のトランスピュ-タを用いた並列演算における計算効果" 日本機械学会論文集(B編).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 河村 洋: "トランスピュ-タを用いた熱流体数値解析の並列演算" 日本機械学会熱工学部門講演会論文集. 73-74 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 稲垣 詠一: "ポアソン方程式のトランスピュ-タを用いた並列演算における計算効率" 日本機械学会第4回計算力学講演会論文集. 143-144 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 栗原 正人: "表面張力差による流動および表面形状に関する数値解析" 日本機械学会熱工学講演会論文集. 99-100 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 河村 洋: "トランスピュ-タによる並列演算と計算効率" 日本機械学会69期通常総会,先端技術フォ-ラム講演資料. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Hiroshi Kawamura: "Parallel Computation of Thermohydraulics using a Transputer Array" Trans. JSME (B). 57-540. 222-227 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Eiichi Inagaki: "Efficiency of Parallel Computation of Poisson Equation using a Transputer Array" Trans. JSME (B).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Hiroshi Kawamura: "Parallel Computation of Thermohydraulics using a Transputer Array" Proc. JSME Conf., division of thermal Engineering. 73-74 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Eiichi Inagaki: "Efficiency of Parallel Computation of Poisson Equation using a Transputer Array" Proc. JSME Conf., division of Computational Mechanics. 143-144 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Masato Kurihara: "Unsteady Thermocapillary Flow in a Melt Layer" Proc. JSME Conf., division of Thermal Engineering. 83-84 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Hiroshi Kawamura: "Transputer based Parallel Computation and Efficiency" Forum of Frontier Technology, Proc., JSME Conf.(1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 河村 洋: "トランスピュ-タを用いた熱・流体数値解析の並列演算" 日本機械学会論文集(B編). 57. 222-227 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 稲垣 詠一: "ポアソン方程式のトランスピュ-タを用いた並列演算における計算効率" 日本機械学会論文集(B編).

    • Related Report
      1991 Annual Research Report
  • [Publications] 河村 洋: "トランスピュ-タを用いた熱・流体数値解析の並列演算" 日本機械学会熱工学部門講演論文集. 73-74 (1990)

    • Related Report
      1991 Annual Research Report
  • [Publications] 稲垣 詠一: "ポアソン方程式のトランスピュ-タを用いた並列演算における計算効率" 日本機械学会第4回計算力学講演会論文集. 143-144 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 栗原 正人: "表面張力差による流動および表面形状に関する数値解析" 日本機械学会熱工学講演会論文集. 99-100 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 河村 洋: "トランスピュ-タによる並列演算と計算効率" 日本機械学会69期通常総会,先端技術フォ-ラム講演資料. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 河村 洋: "トランスピュ-タを用いた熱流体数値解析の並列演算" 日本機械学会論文集.

    • Related Report
      1990 Annual Research Report

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Published: 1989-03-31   Modified: 2016-04-21  

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