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Development of optimum cooling systemn of water spraying for a high temperature metal

Research Project

Project/Area Number 04555163
Research Category

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

Allocation TypeSingle-year Grants
Research Field 金属加工(含鋳造)
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

HATTA Natsuo  Kyoto University, Faculty of Engg., Professor, 工学部, 教授 (30026041)

Co-Investigator(Kenkyū-buntansha) SORIMACHI Ken-ichi  Kawasaki Steel Corp, Steel labo.Director, 技術研究本部, 製鋼研究室長
FUJIMOTO Hitoshi  Kyoto University, Faculty of Engg., Assistant, 工学部, 助手 (40229050)
TAKUDA Hirohiko  Kyoto University, Faculty of Engg., Lecturer, 工学部, 講師 (20135528)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥8,100,000 (Direct Cost: ¥8,100,000)
Fiscal Year 1993: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1992: ¥6,600,000 (Direct Cost: ¥6,600,000)
KeywordsMist flow / Water spray / Gas-particle two-phase flow / Leidenfrost temperature / Estimation of cooling capacity / Collision and deformation of droplet on a plate / Film boiling heat transfer / Predictable modelling / 気一液の相流 / 冷却能制御 / ローディング比 / 水量密度 / 濡れ点 / ウェーバ数
Research Abstract

We believe that the intially anticipated purpose of this research has been attained for the most part. This research basically covers a few special fields such as computational fluid dynamics, two-phase flow theory, heat transfer and numerical analysis, and therefore the research consists of the three stages. The results obtained here are summarized as follows :
First, the nozzle frow of a two-phase mixture composed of air and water droplets, the flow mechanism of the two-phase free jet and the flow behavior of the two-phase freejet impinging on a flat plate have been unmerically analyzed. However, the deformation process of droplets impinging even a flat plate with an ordinary room temperature has not yet been clarified regardless of the challenge of many researchers. Hence, the numerical model to assess the deformation process has been established by our research group. Also, it has been confirmed that the deformation process calculated by the present model is in fairly good agreement … More with experimental data. The paper concerned with this result has been submitted to the Trans. ASME Journal of Fluids Engineering for publication.
Second, it has been experimentally clarified that the deformation behavior of droplets impinging on a hot plate surface beyond the Leidenfrost point can be classified into three kinds of patterns. Basically, the droplet deformation behavior may be classified into two kinds of patterns according to whether the droplet crushes or not after the collision with the plate surface. Taking into account the configuration of droplet of the case where the droplet does not crush, there seems to be three kinds of patterns. The condition whether the droplet crushes or otherwise is dependent not only upon the We number, but also upon the surface temperature and properties etc.. Also, we have clarified the overall mechanism of the crushed and deformation for each pattern, although it is not theoretical but empirical.
Third, the estimation of cooling process of a hot plate surface beyond the Leidenfrost temperature by water spray have considered so that the assess of the cooling intensity is available for an actual operation in the secondary cooling zone of the continuous casting process. In order to do so, the high temperature metal surface has been cooled by many kinds of water sprays of which the water flow rate is entirely different from each other and each temperature process with time has been measured by the CA thermocouples. Thereby, the predictable modeling for cooling process of a hot plate by a water spray has been constructed by the inverse analysis.
Finally, we think that there are a number of problems which remains unsolved and wish to promote the present investigation further. Less

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 八田夏夫: "Numerical Analysis of Gas-Particle Two-Phase Subsonic Freejets" Trans.ASME Journal of Fluids Engineering. 114. 420-429 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 八田夏夫: "Numerical Analysis of Flow Pattern of Impinging Liquid Sprays in a Cold Model for Cooling a Hot Flat Plate" Applied Scientific Research(Kluwer Academic Publishers). 50. 129-147 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 宅田裕彦: "Possibility of Grain Refinement for Superplasticity of a Mg-Al-Zn Alloy by Pre-Deformation" Journal of Materials Science. 27. 937-940 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 宅田裕彦: "Mechanical Properties of Type 304 Stainless Steel Sheet Produced by Twin-Roll Strip Casting Process" Steel Research(Arch.f.Eisenfuettennes). 64. 132-135 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 八田夏夫: "Removal of Fine Particles from Porous Ores by Pneumatic Classifier of Horizontal Type" Trans.Instin.Min.Metall.(Sect C:Mineral Process.Extr.Metal). 102. 139-148 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Natsuo Hatta, Ryuji Ishii and Hitoshi Fujimoto: "Numerical Analysis of Gas-Particle Two-Phase Subsonic Freejets" Trans.ASME Journal of Fluids Engineering. 114. 420-429 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Natsuo Hatta, Hitoshi Fujimoto and Hirohiko Takuda: "Numerical Analysis of Flow Pattern of Impinging Liquid Sprays in a Cold Model for Cooling a Hot Flat Plate" Applied Scientific Research(Kluwer Academic Publishers). 50. 129-147 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Natsuo Hatta, Hitoshi Fujimoto and Hirohiko Takuda: "Deformation Process of Water Droplet Impinging on a Plate Surface" to be submitted to Trans.ASME J.of Fluids Engg.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Hirohiko Takuda, Shiomi Kikuchi and Natsuo Hatta: "Possibility of Grain Refinement for Superplasticity of a Mg-Al-Zn Alloy by Pre-Deformation" Journal of Materials Science. 27. 937-940 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Hirohiko Takuda, Shiomi Kikuchi, Natsuo Hatta and Jun-ichi Kokado: "Mechanical Properties of Type 304 Stainless Steel Sheet Produced by Twin-Roll Strip Casting Process" Steel Research (Arch.f.Eisenfuettenwes). 64. 132-135 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Natsuo Hatta, Jun-ichi Kokado and Shin Yabusita: "Removal of Fine Particles from Porous Ores by Pneumatic Classifier of Horizontal Type" Trans.Instin.Min.Metall.(Sect C : Mineral Process. Extr.Metall.). 102. 139-148 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 八田夏夫: "Numerical analysis of gas-particle two-phase subsonic freejet" ASME J.Fluids Engg.114. 420-429 (1992)

    • Related Report
      1993 Annual Research Report
  • [Publications] 八田夏夫: "Numerical analysis of flow pattern of impinging liquid sprays in a cold model for cooling a hot flat plate" Applied Scientific Research. 50. 129-147 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 八田 夏夫: "Numerical Analysis of Gas-Particle Two-phase Subsonic Freejet" ASME J.Fluids Engg.114. 420-429 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 藤本 仁: "平板に衝突する二相ジェットの数値シミュレーション" CAMP-ISIJ. 5. 508- (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 八田 夏夫: "Numerical Analysis of Flow Pattern of Impinging Liquid Sprays in a Cold Model for Cooling a Hot Flat Plate" Applied Socientific Research(Kluwer Academic Publishers.).

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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