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Study on flow structure and atomization mechanism of multiphase flow in a converging-diverging nozzle

Research Project

Project/Area Number 19K04210
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 19020:Thermal engineering-related
Research InstitutionUniversity of Tsukuba

Principal Investigator

Kaneko Akiko  筑波大学, システム情報系, 准教授 (40396940)

Co-Investigator(Kenkyū-buntansha) 阿部 豊  筑波大学, システム情報系, 名誉教授 (10241720)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywordsベンチュリ管 / 微細気泡 / 微粒化 / キャビテーション / 混相流 / ベンチュリ管式微細気泡発生装置 / 微細化 / 溶存酸素量 / マイクロバブル / 溶存ガス濃度 / 縮小拡大ノズル / 音速
Outline of Research at the Start

本研究の目的は縮小拡大管を微粒化装置として確立することにある。縮小拡大管内に気液二相流や気相単相流を流すことで、その特異な流路形状により著しいせん断流動場や超音速流動場が生じる。目指すものは、このような流動場により引き起こされる力を用いて気・液・固体を粉砕し微粒化する装置の実用化である。その実現のため、相変化を加味した縮小拡大管内の混相流動場に働く静的および動的な力の変動を定量的に解明する。
本装置の確立は、単純な管路で自在に用途に応じた微小気泡、微細粒子、微小液滴の生成が可能となり、環境問題を見据えた利活用において世界規模でのグリーンイノベーションに貢献することができる。

Outline of Final Research Achievements

In order to establish the shrinking-expanding tube as an atomization device, an experimental study was conducted to elucidate the atomization phenomena of solids and bubbles in response to the flow field in the shrinking-expanding tube. As a result, using allophene as the solid particle, the allophene was atomized downstream of the bubble collapse position, suggesting that the pressure wave generated by bubble atomization may contribute to the atomization of the allophene.
For bubble refinement, the amount of generated vapor was calculated based on experimental and estimated values of void fraction, and it was clarified that bubbles became smaller under conditions with a higher ratio of generated vapor. It was suggested that rapid contraction of bubbles is less likely to occur under high vapor flow rate conditions, which may be one of the factors preventing bubble refinement.

Academic Significance and Societal Importance of the Research Achievements

本研究によりこれまで提案してきたベンチュリ管式微細気泡発生装置が気泡の微細化のみならず、固体粒子の粉砕に寄与することを示した。また、微粒化のみならず同時に発生する微細気泡との相乗効果で、微粒子を遠方場まで輸送する機能を付加するなど、工業的に多岐にわたる利用可能性を示した。気泡の微細化においては、混相流の相変化という極めて複雑な現象について解明を試み、実験的にキャビテーションが生じる可能性を示した。また、溶存ガス濃度の影響についても考察し、それぞれが発生気泡径に影響を及ぼすことを示した。これらはさらなる研究が必要ではあるものの、混相流の基礎物理の解明に資する結果である。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (21 results)

All 2022 2021 2020 2019 Other

All Journal Article (5 results) (of which Peer Reviewed: 5 results) Presentation (12 results) (of which Int'l Joint Research: 4 results,  Invited: 1 results) Remarks (4 results)

  • [Journal Article] The Breakup Characteristics of Bubbles in Venturi Tubes Under Different Levels of Dissolved Gas2022

    • Author(s)
      Noor Saffreena, Akiko Kaneko
    • Journal Title

      混相流

      Volume: -

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Bubble Collapse Phenomenon of Multiphase Flow Field in a Venturi Tube2021

    • Author(s)
      KIDO Naoki、KANEKO Akiko、ABE Yutaka、IKE Masatoshi
    • Journal Title

      JAPANESE JOURNAL OF MULTIPHASE FLOW

      Volume: 35 Issue: 1 Pages: 51-59

    • DOI

      10.3811/jjmf.2021.009

    • NAID

      130008024969

    • ISSN
      0914-2843, 1881-5790
    • Year and Date
      2021-03-15
    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Low Environmental Impact Cleaning Technology with Ozone Micro-Bubbles Generated by a Venturi Tube2020

    • Author(s)
      YU Ruoyi、KANEKO Akiko、ABE Yutaka、IKE Masatoshi
    • Journal Title

      JAPANESE JOURNAL OF MULTIPHASE FLOW

      Volume: 34 Issue: 1 Pages: 46-54

    • DOI

      10.3811/jjmf.2020.003

    • NAID

      130007827285

    • ISSN
      0914-2843, 1881-5790
    • Year and Date
      2020-03-15
    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Effect of Gas-Liquid Two-Phase Flow in a Venturi Tube on Atomization and Transportation of Coagulant2020

    • Author(s)
      ISHIZAKI Takahiro、KANEKO Akiko、TAKEMURA Fumio、IKE Masatoshi、ABE Yutaka
    • Journal Title

      JAPANESE JOURNAL OF MULTIPHASE FLOW

      Volume: 34 Issue: 1 Pages: 55-63

    • DOI

      10.3811/jjmf.2020.004

    • NAID

      130007827286

    • ISSN
      0914-2843, 1881-5790
    • Year and Date
      2020-03-15
    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] 排熱回収技術への適用を目指した高耐圧マイクロチャネル熱交換器内沸騰現象の解明2019

    • Author(s)
      金子暁子,弗田昭博,阿部 豊,鈴木 裕
    • Journal Title

      ボイラ研究

      Volume: 418 Pages: 29-34

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] Cavitation Effects on Bubble Breakup Characteristics in a Venturi Tube2022

    • Author(s)
      Noor Saffreena Binti Hamdan
    • Organizer
      7TH Thermal and Fluids Engineering Conference (Hybrid)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] キャビテーション影響によるベンチュリ管内の気泡 崩壊現象2022

    • Author(s)
      Noor Saffreena Binti Hamdan
    • Organizer
      日本機械学会 関東支部 第28期総会・講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Comparison Study of Microbubble Collapse Phenomena Under Different Dissolved gas level2021

    • Author(s)
      Noor Saffreena Binti Hamdan
    • Organizer
      混相流シンポジウム2021
    • Related Report
      2021 Annual Research Report
  • [Presentation] ベンチュリ管内混相流動場における気泡崩壊現象2020

    • Author(s)
      木戸直樹, 金子暁子, 阿部豊, 池昌俊
    • Organizer
      混相流シンポジウム2020
    • Related Report
      2020 Research-status Report
  • [Presentation] Relation between gas-liquid two-phase flow structure and bubble breakup behavior in a converging-diverging nozzle2020

    • Author(s)
      Akiko Kaneko, Keita Fujii, Shinichiro Uesawa, Yutaka Abe
    • Organizer
      Kick-off Symposium of JAPAN Consortium for Theoretical and Applied Mechanics
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] ベンチュリ管内気泡崩壊に及ぼすキャビテーション現象の影響2020

    • Author(s)
      木戸 直樹, 金子 暁子, 阿部 豊, 池 昌俊
    • Organizer
      日本機械学会 関東支部 第26期総会・講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] Research on Atomization and Transportation of Coagulant Using the Microbubble Generator with a Venturi Tube2019

    • Author(s)
      Takahiro Ishizaki, Keita Fujii, Akiko Kaneko, Fumio Takemura, Masatoshi Ike, Yutaka Abe
    • Organizer
      10th International Conference on Multiphase Flow
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Degreasing technology with Ozone micro-bubbles generated by a Venturi tube2019

    • Author(s)
      Yu Ruoyi, Keita Fujii, Akiko Kaneko, Yutaka Abe, Masatoshi Ike
    • Organizer
      10th International Conference on Multiphase Flow
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] ベンチュリ管式オゾンマイクロバブルを用いた低環境負荷洗浄技術2019

    • Author(s)
      YU RUOYI,金子暁子,阿部 豊,池昌俊
    • Organizer
      第30回日本化学学会関東支部茨城地区研究交流会
    • Related Report
      2019 Research-status Report
  • [Presentation] ベンチュリ管内におけるキャビテーション現象2019

    • Author(s)
      木戸 直樹,金子暁子,阿部 豊,池昌俊
    • Organizer
      第30回日本化学学会関東支部茨城地区研究交流会
    • Related Report
      2019 Research-status Report
  • [Presentation] ベンチュリ管式オゾンマイクロバブルによる低環境負荷洗浄技術2019

    • Author(s)
      YU RUOYI, 阿部豊, 金子暁子, 池昌俊
    • Organizer
      混相流シンポジウム2019
    • Related Report
      2019 Research-status Report
  • [Presentation] ベンチュリ管内気液二相流が凝集剤の微粒化および輸送に及ぼす影響2019

    • Author(s)
      石﨑貴大,金子暁子, 竹村文男, 池昌俊, 阿部豊
    • Organizer
      混相流シンポジウム2019
    • Related Report
      2019 Research-status Report
  • [Remarks] 筑波大学 熱流体制御・計測研究室

    • URL

      http://www.kz.tsukuba.ac.jp/~abe/

    • Related Report
      2021 Annual Research Report
  • [Remarks] 筑波大学システム情報工学研究群構造エネルギー工学学位プログラム

    • URL

      https://www.eme.tsukuba.ac.jp/

    • Related Report
      2021 Annual Research Report
  • [Remarks] 熱流体制御・計測研究室

    • Related Report
      2020 Research-status Report
  • [Remarks] 熱流体制御・計測研究室

    • URL

      http://www.kz.tsukuba.ac.jp/~abe/

    • Related Report
      2019 Research-status Report

URL: 

Published: 2019-04-18   Modified: 2023-01-30  

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