Study on Near-field Thermal Radiation in Submicron Range and Application of Active radiation device

• Project/Area Number: 26820058
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Thermal engineering
• Research Institution: The University of Tokyo
• Principal Investigator: UENO Ai 東京大学, 工学(系)研究科(研究院), 研究員 (50647211)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2015: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000); Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 熱ふく射 / 近接場 / ナノギャップ / MEMSラジエータ / 近接場効果 / 熱ふく射制御 / MEMS / 静電アクチュエータ

Outline of Final Research Achievements

Radiation control is crucial to maintain the operation temperature of satellites under varying irradiation of sunlight. Previously, bulky heat exchangers with heat pipe or thermal louvers/shutters with a low fill factor are proposed for the task, although they are not suitable for next-generation small satellites. In the present study, we propose an array of electrostatically-driven MEMS(Micro-Electro-Mechanical Systems) diaphragms for active control of thermal radiation using the near-field effect. We have successfully fabricated a prototype with parylene shared springs and achieved a fill factor of as high as 89 %. It is found that at the ON state, the diaphragm temperature is increased from 58.0 ℃ to 106.4 ℃, showing 144 % enhancement in the radiation heat flux.

Research Products

• [Presentation] 共有ばねを有する近接場効果を用いた高開口率MEMSラジエータの開発 (2016)
  • Author(s): 呉 承哲，林 祐樹，中島 寛貴，上野 藍，森本 賢一，鈴木 雄二
  • Organizer: 第53回日本伝熱シンポジウム
  • Place of Presentation: 大阪
  • Year and Date: 2016-05-24
• [Presentation] Development of Near-Field-Enhanced High-Fill-Factor MEMS Radiator with Shared Springs (2015)
  • Author(s): Nakajima, H., Oh, S., Ueno, A., Morimoto, K., and Suzuki, Y.
  • Organizer: 15th Int. Workshop on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS 2015)
  • Place of Presentation: Boston, USA
  • Year and Date: 2015-12-01
  • Int'l Joint Research
• [Presentation] 近接場熱輻射を用いた高開口率MEMSラジエータに関する研究 (2015)
  • Author(s): 中島 寛貴, 上野 藍, 森本 賢一, 鈴木 雄二
  • Organizer: 日本機械学会熱工学コンファレンス2015
  • Place of Presentation: 大阪
  • Year and Date: 2015-10-24
• [Presentation] High-Fill-Factor MEMS Radiator Using Near-Field Thermal Radiation (2015)
  • Author(s): Hirotaka Nakajima, Ai Ueno, Kenichi Morimoto, and Yuji Suzuki
  • Organizer: First SNU-UT Workshop on Mechanical and Aerospace Engineering
  • Place of Presentation: Seoul National University, South Korea
  • Year and Date: 2015-03-06 – 2015-03-07
• [Presentation] Thermal Radiation Characteristics in sub-micron region for MEMS Space Radiator (2014)
  • Author(s): Ai Ueno and Yuji Suzuki
  • Organizer: the 15th International Heat Transfer Conference (IHTC-15)
  • Place of Presentation: Kyoto International Conference Center, Kyoto
  • Year and Date: 2014-08-10 – 2014-08-15