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2019 年度 実績報告書

着霜特性の3D計測と除霜性能向上に関する研究

研究課題

研究課題/領域番号 17F17365
研究機関東京大学

研究代表者

党 超鋲  東京大学, 大学院新領域創成科学研究科, 准教授 (30401227)

研究分担者 SONG MENGJIE  東京大学, 新領域創成科学研究科, 外国人特別研究員
研究期間 (年度) 2017-11-10 – 2020-03-31
キーワードHeterogeneous nucleation / droplet solidification / freezing front / trapped air bubbles / temperature distribution / frost and ice
研究実績の概要

As the prerequisite of frosting and icing, solidification of water droplets was firstly investigated in this project.A Hele-Shaw cell was designed and used to observe the solidification characteristics of two-dimensional water droplets. including heterogeneous nucleation, droplet morphology,freezing front evolution, trapped air bubbles, and temperature distribution inside a droplet, etc.
Air bubbles in frozen two-dimensional hydrophobic type water droplets were investigated in this year by quantitatively comparing the air releasing process from water droplets during freezing-melting cycles using pumped air distilled water and new made distilled water. Firstly, the subcooling degree would decrease as the dissolved air escaped from the bubbles in the melting stage. For new made distilled water droplet, the nucleation for three cycles did not occur until the experimental condition of the surface temperature was changed from -20 oC to -30 oC. Secondly, during the freezing-melting cycles, the air bubbles become smaller in dimension, and more in total number. Thirdly, the total escaped air volumes for two water droplets are obvious different due to different air dissolved content at start, while the total proportions for three cycles are similar, at 15.87% and 14.02% for two water droplets. Finally, the escaped air content, water droplet temperature decrease duration, and the subcooling degree for two water droplets surround with oil show the same fluctuation trend in the three freezing-melting cycles.

現在までの達成度 (段落)

令和元年度が最終年度であるため、記入しない。

今後の研究の推進方策

令和元年度が最終年度であるため、記入しない。

  • 研究成果

    (3件)

すべて 2020 2019

すべて 雑誌論文 (3件) (うち国際共著 3件、 査読あり 3件)

  • [雑誌論文] Review of experimental data associated with the solidification characteristics of water droplets on a cold plate surface at the early frosting stage2020

    • 著者名/発表者名
      Mengjie Song, Chaobin Dang, Tomohiro Higashi, Eiji Hihara
    • 雑誌名

      Energy and Buildings

      巻: 223 ページ: 110103

    • DOI

      doi.org/10.1016/j.enbuild.2020.110103

    • 査読あり / 国際共著
  • [雑誌論文] Experimental investigation on the heat transfer characteristics of novel rectangle radial microchannel heat exchangers in two-phase flow cooling system for data centers2019

    • 著者名/発表者名
      Mengjie Song, Chaobin Dang, Eiji Hihara
    • 雑誌名

      Journal of Thermal Analysis and Calorimetry

      巻: 12 ページ: 1-13

    • DOI

      doi.org/10.1007/s10973-019-09090-y

    • 査読あり / 国際共著
  • [雑誌論文] An experimental study on the heat transfer performance of a loop heat pipe system with ethanol-water mixture as working fluid for aircraft anti-icing2019

    • 著者名/発表者名
      Qian SU,Shinan CHANG,Mengjie SONG, Yuanyuanc ZHAO, chaobin DANG
    • 雑誌名

      International Journal of Heat and Mass Transfer

      巻: 139 ページ: 280-292

    • DOI

      doi.org/10.1016/j.ijheatmasstransfer.2019.05.015

    • 査読あり / 国際共著

URL: 

公開日: 2021-01-27  

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