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Development of external two-phase flow prediction method applicable to seawater environment

Research Project

Project/Area Number 17H03487
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Naval and maritime engineering
Research InstitutionTokyo University of Marine Science and Technology

Principal Investigator

Hazuku Tatsuya  東京海洋大学, 学術研究院, 教授 (60334554)

Co-Investigator(Kenkyū-buntansha) 井原 智則  東京海洋大学, 学術研究院, 助教 (70767350)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥16,380,000 (Direct Cost: ¥12,600,000、Indirect Cost: ¥3,780,000)
Fiscal Year 2019: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2018: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2017: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Keywords船舶工学 / 空気潤滑法 / 気液二相流 / 外部流れ / 抵抗低減
Outline of Final Research Achievements

This study was aimed at developing a new analytical method for the external two-phase flow in the seawater, which contributes improvement of a ship drag reduction technology based on the air lubrication method.
The database on local flow structures in the external two-phase flow under a model ship bottom was newly constructed through the experiment using a circulation water tunnel. Experiments for a single bubble and bubbly flows in the seawater were also performed to identify the characteristics of the interfacial drag of a single bubble and the bubble coalescence in the seawater. Based on the obtained experimental data and the analytical results, a modeling of the external two-phase flow was examined by taking the bubble layer thickness as a length scale and a new correlation for predicting void fraction under the ship bottom was successfully developed.

Academic Significance and Societal Importance of the Research Achievements

海水中および外部流れの二相流の局所流動構造に着目した研究は、国内外において類例がほとんどなく、その実験的、解析的研究を実施した本研究は、現状に鑑みて新規性が高い。本研究により、外部流れの二相流の流動機構と海水中の気泡挙動に関する新たな知見が得られ、さらに外部流れの二相流を対象とした新しいボイド率予測式が開発された。これらの成果は、これまで開発途上であった海水中および外部流れの二相流の解析技術を進展させるものであり、今後のさらなる研究の推進によって、空気潤滑法による船体抵抗低減技術の高度化が期待できる。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Annual Research Report
  • 2017 Annual Research Report

Research Products

(9 results)

All 2019 2018 2017

All Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (6 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Measurement of local two-phase flow parameters of downward bubbly flow in mini pipes2019

    • Author(s)
      Hazuku Tatsuya、Ihara Tomonori、Hibiki Takashi
    • Journal Title

      Experimental and Computational Multiphase Flow

      Volume: 2 Issue: 2 Pages: 89-98

    • DOI

      10.1007/s42757-019-0039-5

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 矩形流路内気液二相流の局所流動パラメータの計測2019

    • Author(s)
      波津久達也、井原智則
    • Journal Title

      マリンエンジニアリング学術講演会講演論文集

      Volume: 89th Pages: 275-276

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Experimental Study of Two-phase Flow Structure and Drag Reduction in Horizontal Rectangular Channel2018

    • Author(s)
      Ihara Tomonori、Andayi Samwel Aloyo、Hazuku Tatsuya、Takamasa Tomoji、Hibiki Takashi
    • Journal Title

      Marine Engineering

      Volume: 53 Issue: 3 Pages: 336-341

    • DOI

      10.5988/jime.53.336

    • NAID

      130006742811

    • ISSN
      1346-1427, 1884-3778
    • Year and Date
      2018-05-01
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 矩形流路内気液二相流の局所流動パラメータの計測2019

    • Author(s)
      波津久達也、井原智則
    • Organizer
      第89回(2019年)マリンエンジニアリング学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Experimental Study of Two-phase Flow Structure and Drag Reduction in Horizontal Rectangular Channel2017

    • Author(s)
      Tomonori Ihara, Samwel Aloyo Andayi, Tatsuya Hazuku, Tomoji Takamasa, Takashi Hibiki
    • Organizer
      The 11th International Symposium on Marine Engineering (ISME2017 TOKYO)
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 水平矩形流路内二相流におけるボイド率と壁面摩擦抵抗低減2017

    • Author(s)
      椎野僚太, 井原智則, 波津久達也, 賞雅寛而
    • Organizer
      日本混相流学会混相流シンポジウム2017
    • Related Report
      2017 Annual Research Report
  • [Presentation] Measurements of Two-Phase Flow Structure and Wall Shear Stress in Horizontal Rectangular Channel2017

    • Author(s)
      Tomonori Ihara, Tatsuya Hazuku
    • Organizer
      Japan-U.S. Seminar on Two-Phase Flow Dynamics 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 海水中に形成する気泡の上昇特性と合一特性について2017

    • Author(s)
      熊匯捷, 井原智則, 波津久達也, 賞雅寛而
    • Organizer
      第87回(平成29年)マリンエンジニアリング学術講演会
    • Related Report
      2017 Annual Research Report
  • [Presentation] 矩形流路内に形成する二相流の流動構造と壁面摩擦特性2017

    • Author(s)
      椎野僚太, 井原智則, 波津久達也, 賞雅寛而
    • Organizer
      第87回(平成29年)マリンエンジニアリング学術講演会
    • Related Report
      2017 Annual Research Report

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Published: 2017-04-28   Modified: 2021-02-19  

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