Study on the heat transfer mechanism of boiling and condensation in superfluid helium under microgravity condition

2017 Fiscal Year Final Research Report

• Project/Area Number: 25289300
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Aerospace engineering
• Research Institution: National Institute for Fusion Science
• Principal Investigator: TAKADA SUGURU 核融合科学研究所, ヘリカル研究部, 助教 (30578109)
• Co-Investigator(Kenkyū-buntansha): 木村 誠宏 大学共同利用機関法人高エネルギー加速器研究機構, 超伝導低温工学センター, 准教授 (10249899) ; 村上 正秀 筑波大学, システム情報系(名誉教授), 名誉教授 (40111588)
• Research Collaborator: OKAMURA Takahiro 大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 准教授 (90415042) ; NOZAWA Masakazu 秋田工業高等専門学校, 創造システム工学科, 准教授 (60447183) ; MAMIYA Mikito ; NAGAI Hideaki ; Pietrowicz Slawomir ; Grunt Kryzstof ; Guo Wei ; Mastracci Brian
• Project Period (FY): 2013-04-01 – 2018-03-31
• Keywords: 微小重力 / 超流動ヘリウム / 可視化 / 沸騰

Outline of Final Research Achievements

The microgravity experiments of boiling and condensation in superfluid fluid (He II)were carried out successfully using by a drop tower. The analysis results on the visualization experiment was found the heat transfer mechanism on the vapor liquid interface during boiling in He II under microgravity environment.The prediction model of bubble expansion were described basis on this experimental results. We also found that the critical heat flux in microgravity can be predict using by the data on the earth gravity. And we tried to visualize the fluid motion of normal fluid component around vapor during boiling with the PIV(Particle Image Velocimetry) method. The flow filed was determined by the heat flux calculated by the length from the heat source and the bubble motion.

Free Research Field

極低温工学