Ice nucleation of water droplet in supersonic air streams

• Project/Area Number: 21760145
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Fluid engineering
• Research Institution: Fukuoka Industrial Technology Center
• Principal Investigator: SHUZENJI Kiyotaka 福岡県工業技術センター, 機械電子研究所, 研究員 (00416504)
• Project Period (FY): 2009 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2011: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2010: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2009: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: 混相流 / 氷核生成 / 熱工学 / 流体工学

Research Abstract

The process of the atomization of water and the ice nucleation of the droplet in Laval nozzle were investigated through the experiment with a phase Doppler particle analyzer and the unsteady thermal conductive analysis by the Heisler chart. The experimental results show that the droplet was atomized and accelerated primarily in the region of 60mm downstream from the throat. The profile of the axial velocity at the nozzle exit is similar to the shape of Hagen-Poiseuille flow which fully developed. The axial mean velocity and the arithmetic mean diameter were 473m/s and 5.6um respectively at the nozzle exit with the water flow rate of 10 mL/min. The thermal conductive analyses indicate that the droplet which diameter is smaller than 5 um freezes inside the nozzle regardless the relative velocity for the air streams.

Research Products

• [Journal Article] マイクロアイスジェット洗浄技術 (2009)
  • Author(s): 周善寺清隆、星野高明
  • Journal Title: 砥粒加工学会誌 Pages: 548-551
  • NAID: 10025103314
• [Journal Article] マイクロアイスジェット洗浄技術 (2009)
  • Author(s): 星野高明, 周善寺清隆
  • Journal Title: 砥粒加工学会誌 53 Pages: 548-551
  • NAID: 10025103314
  • Peer Reviewed
• [Presentation] 超音速空気流れによる水の微粒化 (2011)
  • Author(s): 周善寺清隆
  • Organizer: 第20回微粒化シンポジウム
• [Book] 先端産業分野における洗浄技術 (2010)
  • Author(s): 星野高明、周善寺清隆
  • Total Pages: 37
• [Book] 先端産業分野における洗浄技術 (2010)
  • Author(s): 星野高明, 周善寺清隆
  • Total Pages: 305
  • Publisher: シーエムシー出版