2022 Fiscal Year Final Research Report
Development of temperature and velocity measurement method for low temperature flow and its application to the measurement of turbulent heat flux
| Project/Area Number |
20H02073
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 19010:Fluid engineering-related
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| Research Institution | National Institute of Advanced Industrial Science and Technology |
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Principal Investigator |
SOMEYA SATOSHI 国立研究開発法人産業技術総合研究所, エネルギー・環境領域, 副研究部門長 (00357336)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 可視化 / 燐光 / 温度 / 低温 |
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| Outline of Final Research Achievements |
We evaluated the luminescence properties of organic and inorganic fluorescent materials at low temperatures and found ten substances, six inorganic phosphors and four metal complexes, whose luminescence intensity was more than twice as strong for temperature changes from 0°C to -190°C. For some metal complex molecules, the luminescence intensity changed by -5%/°C on average, indicating a strong temperature dependence of both luminescence intensity and lifetime. Transient temperature measurements were performed using these materials when a heat-transfer surface at temperatures of -60°C～-40°C was pulse-currently heated. Temperature measurement accuracy of ±1.29°C was obtained for metal complexes, and ±1.73°C for inorganic phosphors. Particles containing metal complexes were prepared, and simultaneous temperature-velocity measurements of low-temperature liquid flow at -30°C were also successfully performed.
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| Free Research Field |
流体計測
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| Academic Significance and Societal Importance of the Research Achievements |
サーモカメラなど他の手法では測定できない低温の温度場計測を実現した．将来の液体水素やLNGなど冷熱が増えているが，その多くを捨てている．極低温の温度分布を利用する学術研究や，冷熱エネルギーを有効活用するための技術開発には本計測技術が不可欠である．また，表面温度だけでなく，低温の流体の温度速度も測定可能となった．本計測手法は，冷蔵冷凍ショーケースのヒートポンプなど低温の冷媒を使う機器の高効率化にも有用である．
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