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Frosting characteristic measurement and defrosting performance improvement

Research Project

Project/Area Number 17F17365
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section外国
Research Field Thermal engineering
Research InstitutionThe University of Tokyo

Principal Investigator

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

Co-Investigator(Kenkyū-buntansha) SONG MENGJIE  東京大学, 新領域創成科学研究科, 外国人特別研究員
Project Period (FY) 2017-11-10 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2019: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2018: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2017: ¥600,000 (Direct Cost: ¥600,000)
KeywordsHeterogeneous nucleation / droplet solidification / freezing front / trapped air bubbles / temperature distribution / frost and ice / 着霜 / 除霜 / 白色干渉計
Outline of Annual Research Achievements

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.

Research Progress Status

令和元年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和元年度が最終年度であるため、記入しない。

Report

(3 results)
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • Research Products

    (9 results)

All 2020 2019 2018 2017

All Journal Article (6 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 6 results) Presentation (3 results) (of which Int'l Joint Research: 1 results)

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

    • Author(s)
      Mengjie Song, Chaobin Dang, Tomohiro Higashi, Eiji Hihara
    • Journal Title

      Energy and Buildings

      Volume: 223 Pages: 110103-110103

    • DOI

      10.1016/j.enbuild.2020.110103

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Experimental investigation on the heat transfer characteristics of novel rectangle radial microchannel heat exchangers in two-phase flow cooling system for data centers2019

    • Author(s)
      Mengjie Song, Chaobin Dang, Eiji Hihara
    • Journal Title

      Journal of Thermal Analysis and Calorimetry

      Volume: 12 Issue: 1 Pages: 1-13

    • DOI

      10.1007/s10973-019-09090-y

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] 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

    • Author(s)
      Qian SU,Shinan CHANG,Mengjie SONG, Yuanyuanc ZHAO, chaobin DANG
    • Journal Title

      International Journal of Heat and Mass Transfer

      Volume: 139 Pages: 280-292

    • DOI

      10.1016/j.ijheatmasstransfer.2019.05.015

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Review on frost characteristics measurement and calculation2018

    • Author(s)
      Song Mengjie, Dang Chaobin
    • Journal Title

      International Journal of Heat and Mass Transfer

      Volume: 124 Pages: 586-614

    • DOI

      10.1016/j.ijheatmasstransfer.2018.03.094

    • Related Report
      2018 Annual Research Report 2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Energy transfer procession in an air source heat pump unit during defrosting with melted frost locally drainage in its multi-circuit outdoor coil2018

    • Author(s)
      Mengjie Song, Chaobin Dang, Ning Mao, Shiming Deng
    • Journal Title

      Energy and Buildings

      Volume: 164 Pages: 109-120

    • DOI

      10.1016/j.enbuild.2018.01.004

    • Related Report
      2018 Annual Research Report 2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Review on improvement for air source heat pump units during frosting and defrosting2018

    • Author(s)
      Mengjie Song,Shiming Deng, Chaobin Dang, Ning Mao, Zhihua Wang
    • Journal Title

      Applied Energy

      Volume: 211 Pages: 1150-1170

    • DOI

      10.1016/j.apenergy.2017.12.022

    • Related Report
      2018 Annual Research Report 2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Solidification characteristics of a two-dimensional water droplet on the horizontal cold plate surface (水平冷板面上の二次元水滴の凝固特性)2019

    • Author(s)
      Song Mengjie, Dang Chaobin, Hihara Eiji
    • Organizer
      Japan Heat Transfer Symposium
    • Related Report
      2018 Annual Research Report
  • [Presentation] Experimental investigation on the two phase flow and heat transfer characteristics of a novel radial microchannel heat exchanger (新型放射状マイクロチャネル熱交換器における流動沸騰伝熱特性に関する研究)2018

    • Author(s)
      Song Mengjie, Dang Chaobin, Cao Xufa, Dang Chao, Liu Xinxin
    • Organizer
      apan Society of Refrigeration and Air Conditioning Engineers (JSRAE) Annual Conference
    • Related Report
      2018 Annual Research Report
  • [Presentation] Melted Frost Influence on Metal Energy Storage of ASHP Defrosting Performance2017

    • Author(s)
      Mengjie Song, Chaobin Dang, Eiji Hihara, Shiming Deng
    • Organizer
      International Conference on Cryogenics and Refrigeration 2018
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research

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Published: 2017-11-13   Modified: 2024-03-26  

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