TOKAWA, Satoru

写真a

Affiliation

Faculty of Science and Engineering, School of Fundamental Science and Engineering

Job title

Research Associate

Education 【 display / non-display

  • 2017.04
    -
    Now

    Waseda University   Graduate School of Fundamental Science and Engineering  

  • 2015.04
    -
    2017.03

    Waseda University   Graduate School of Fundamental Science and Engineering  

  • 2011.04
    -
    2015.03

    Waseda University   School of Fundamental Science and Engineering  

  • 2008.04
    -
    2011.03

    千葉県立成東高等学校   理数科  

Research Experience 【 display / non-display

  • 2018.04
    -
    Now

    Waseda University   Faculty of Science and Engineering

Professional Memberships 【 display / non-display

  • 2016.04
    -
    Now

    着霜除霜研究会

  • 2015.05
    -
    Now

    日本冷凍空調学会

 

Research Areas 【 display / non-display

  • Thermal engineering

  • Aerospace engineering

Research Interests 【 display / non-display

  • Defrost

  • refrigeration

  • air conditioning

  • frost

  • Super water repellent

display all >>

Papers 【 display / non-display

  • Effects of the Plate Temperature and Absolute Humidity on Frosting Phenomenon under Forced Convection

    Akihiro HATTORI, Takumi KURATA, Satoru TOKAWA, Yudai MORINAGA, Akihiro UEDA, Tetsuya SATO

    Trans. of the JSRAE   Vol.38 ( No.2(2021) ) 59 - 71  2021.06  [Refereed]

  • Heat transfer enhancement in chilldown process with electrospun nanofiber coating

    Katsuyoshi Fukiba, Satoru Tokawa, Hiroki Kawashima, Hiroki Adachi

    Cryogenics   101   75 - 78  2019.07  [Refereed]

     View Summary

    In this study, a method to enhance boiling heat transfer in cryogenic fluids by using nanofiber coating was proposed and validated. For this method, a nanofiber coating of polyvinyl alcohol (PVA) was fabricated on the surface of a copper plate via electrospinning, which is a technique that uses a high-voltage electric field. A chilldown experiment conducted with the copper plate and liquid nitrogen revealed that the nanofiber coating had the potential to reduce the chilldown time drastically. It was observed that the heat flux through the nanofiber-coated plate increased immediately after the chilldown period began, and it exceeded that of the plate without coating for the entire test duration. Consequently, the chilldown (boiling) curve did not have a minimum heat flux point, which is generally seen in pool boiling process. The critical heat flux was twice as large as that of the conventional method with a bare copper plate. Overall, the chilldown curve of the nanofiber-coated plate was distinct from a conventional boiling curve with a bare plate.

    DOI

  • Experimental study of delaying effect of the frost formation on cryogenic heat exchanger tube surfaces using super-hydrophobicity tube by anodic oxidation method

    Satoru Tokawa, Yoshiaki Kinoshita, Takumi Kurata, Ryuma Osumi, Tetsuya Sato

    ACRA 2018 - 9th Asian Conference on Refrigeration and Air-Conditioning    2018  [Refereed]

    Authorship:Lead author

     View Summary

    JAXA is developing the pre-cooled turbojet engine (PCTJ) operated from sea-level static to Mach 5 with the single mechanism. The key technology of PCTJ is the precooler, which is a heat exchanger to cool down the heated incoming air using liquid hydrogen fuel. Frosting on the precooler tube surface is a major problem and some countermeasures have been proposed such as the liquid oxygen injection, methanol injection, high speed air-jet injection, and so on. However, these methods require additional mechanisms increasing the engine weight with their complicated systems. Here, we focus on the surface treatment that does not need any additional mechanism. We made aluminum super-hydrophobicity tubes treated by anodic oxidation and fluorine addition. Our method attains the super-hydrophobicity with about 157 degrees contact angle. The frost formation test using liquid nitrogen was conducted in the wind tunnel. As the results, the total amount of the frost formation can be reduced by about 17% at maximum compared with the untreated tube. However, little improvement on the heat transfer rate was found because the frost density was reduced by super-hydrophobicity.

Misc 【 display / non-display

  • 核形成理論を用いた数理モデルによる平板上への着霜現象の予測

    倉田 琢巳, 服部 皓大, 堀越大輝, 十川 悟, 佐藤 哲也

    日本冷凍空調学会年次大会講演論文集    2019.09

    Research paper, summary (national, other academic conference)  

  • コーティングによる極低温燃料を用いた予冷の高効率化について

    吹場活佳, 小野貴良, 川島紘毅, 足立大季, 十川悟, 佐藤哲也, 小林 弘明

    航空原動機・宇宙推進講演会 講演論文集    2019.03

    Research paper, summary (national, other academic conference)  

  • エレクトロスピニング法により生成したナノファイバー被膜による予冷時間短縮の効果

    川島 紘毅, 吹場 活佳, 小野 貴良, 十川 悟

    平成30年度宇宙輸送シンポジウム: 講演集録    2019.01

    Research paper, summary (national, other academic conference)  

     View Summary

    平成30年度宇宙輸送シンポジウム(2019年1月17日-18日. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)), 相模原市, 神奈川県資料番号: SA6000136048レポート番号: STCP-2018-048

    CiNii

  • ナノファイバー被膜を用いた沸騰伝熱の促進による予冷の高速化

    川島紘毅, 吹場活佳, 小野貴良, 十川悟

    宇宙科学技術連合講演会    2018.10

    Research paper, summary (national, other academic conference)  

  • 陽極酸化法を用いた超撥水伝熱管によるプリクーラ伝熱面への着霜遅延化に関する研究(第2報)着霜への主流流速の影響に関する検討

    十川 悟, 倉田 琢巳, 服部 皓大, 堀越 大輝, 佐藤 哲也

    日本冷凍空調学会年次大会講演論文集     B314  2018.09

    Authorship:Lead author

    Research paper, summary (national, other academic conference)  

    CiNii

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Awards 【 display / non-display

  • 優秀講演賞

    2017.09   日本冷凍空調学会   陽極酸化法を用いた超撥水伝熱管によるプリクーラ伝熱面への着霜遅延化に関する研究

Research Projects 【 display / non-display

  • Improvement of the heat exchanger performance by recucing frost formation on nano unever surface using an anodic osidation method

    Grant-in-Aid for Challenging Research (Exploratory)

    Project Year :

    2019.06
    -
    2022.03
     

Presentations 【 display / non-display

  • 陽極酸化法を用いた超撥水伝熱管によるプリクーラ伝熱面への着霜遅延化に関する研究(第2報)着霜への主流流速の影響に関する検討

    十川 悟, 倉田 琢巳, 服部 皓大, 堀越 大輝, 佐藤 哲也

    日本冷凍空調学会年次大会講演論文集  日本冷凍空調学会

    Presentation date: 2018.09

    Event date:
    2018.09
     
     
  • Experimental study of delaying effect of the frost formation on cryogenic heat exchanger tube surfaces using super-hydrophobicity tube by anodic oxidation method

    Satoru Tokawa, Yoshiaki Kinoshita, Takumi Kurata, Ryuma Osumi, Tetsuya Sato

    ACRA 2018 - 9th Asian Conference on Refrigeration and Air-Conditioning 

    Presentation date: 2018

    Event date:
    2018
     
     

     View Summary

    JAXA is developing the pre-cooled turbojet engine (PCTJ) operated from sea-level static to Mach 5 with the single mechanism. The key technology of PCTJ is the precooler, which is a heat exchanger to cool down the heated incoming air using liquid hydrogen fuel. Frosting on the precooler tube surface is a major problem and some countermeasures have been proposed such as the liquid oxygen injection, methanol injection, high speed air-jet injection, and so on. However, these methods require additional mechanisms increasing the engine weight with their complicated systems. Here, we focus on the surface treatment that does not need any additional mechanism. We made aluminum super-hydrophobicity tubes treated by anodic oxidation and fluorine addition. Our method attains the super-hydrophobicity with about 157 degrees contact angle. The frost formation test using liquid nitrogen was conducted in the wind tunnel. As the results, the total amount of the frost formation can be reduced by about 17% at maximum compared with the untreated tube. However, little improvement on the heat transfer rate was found because the frost density was reduced by super-hydrophobicity.

  • 陽極酸化法を用いた超撥水伝熱管によるプリクーラ伝熱面への着霜遅延化

    十川 悟, 木下 義章, 守屋 篤基, 大住 隆真, 倉田 琢巳, 佐藤 哲也

    平成29年度宇宙輸送シンポジウム: 講演集録  宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)

    Presentation date: 2018.01

    Event date:
    2018.01
     
     

     View Summary

    平成29年度宇宙輸送シンポジウム(2018年1月18日-19日. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)), 相模原市, 神奈川県資料番号: SA6000210039レポート番号: STCP-2017-039

  • 陽極酸化法を用いた超撥水伝熱管によるプリクーラ伝熱面への着霜遅延化に関する研究

    十川悟, 守屋篤基, 木下義章, 佐藤哲也

    日本冷凍空調学会年次大会講演論文集 

    Presentation date: 2017.09

    Event date:
    2017.09
     
     
  • ひれ付伝熱管によるプリクーラ伝熱面への着霜遅延化に関する研究

    十川 悟, 平林 遥介, 木下 義章, 佐藤 哲也

    日本冷凍空調学会年次大会講演論文集  日本冷凍空調学会

    Presentation date: 2016.09

    Event date:
    2016.09
     
     

Specific Research 【 display / non-display

  • 陽極酸化法を用いた超撥水伝熱管による熱交換器の着霜抑制技術の開発

    2018   佐藤哲也

     View Summary

    現状の空調機や冷凍機では高温ガス除霜やヒーター除霜など大きなエネルギを投入し霜を融解させている.そこで申請者は,過去に陽極酸化法による表面処理とフッ素試薬により超撥水性を持たせた伝熱管を考案した.本研究課題では,基礎的データの取得のため, 2m/s,4m/s,6m/sでの流速で液体窒素を冷媒とした着霜試験を行い,着霜と流速との関係を見出すことを目的とし実験的研究を行った.その結果,非処理材に比べ処理材の着霜質量の方が減少した.一方,処理材では6m/s時,伝熱管側方の霜が剥がれて吹き飛び,後方へ再付着する現象が確認され,着霜質量が他の条件よりも高い結果となった.また,前方霜層厚さは処理材の方が厚くなる傾向が確認された.

 

Teaching Experience 【 display / non-display

  • 理工学基礎実験2B

    早稲田大学  

    2018.09
    -
    Now
     

  • 航空宇宙輸送システム演習

    早稲田大学  

    2018.04
    -
    Now
     

  • 航空宇宙輸送システム研究

    早稲田大学  

    2018.04
    -
    Now
     

  • 理工学基礎実験2A

    早稲田大学  

    2018.04
    -
    Now
     

  • 熱力学1

    早稲田大学  

    2018.09
    -
    2019.03