An application of the heat transfer enhancement effect of the self-induced vibration of superfluid helium to the space observation enquipment

超流氦自激振动强化传热效应在空间观测设备中的应用

• 批准号: 14550857
• 负责人: KIMURA Nobuhiro
• 金额: $ 1.86万
• 依托单位: High Energy Accelerator Research Organization (2004)The High Energy Accelerator Research Organization (2002-2003)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14550857/
• 关键词: superfuid helium; superconducting temprature sensor; visualization observation; film boiling mode; pressure dependence; λ-pressure; weakly subcooled film boiling; noisy film boiling; λ点圧力; シャドーグラフ; 透過式薄膜ヒーター; 表面張力波; 光学窓; 可視化法; シュリーレン法; ガスヘリ

The main result of this research would be arranged as follows1) In the strongly subcooled state of the He II, the vapor layer was very thin and the behavior of the vapor layer was relatively stable. As pressure of the He II bath was decreased, the behavior of the vapor layer was intensified gradually and the relatively stable area was diminished. And in the weakly subcooled state of the He II, the thickness of the vapor layer was increased as the decrease of the pressure of the bath. In the case of the pressure adjacent to λ-pressure, it was confirmed that the boiling state changed from stable boiling to unstable boiling. This boundary was confirmed in the pressure higher than 1-pressure.2) The subcooled and the silent film boiling in the He II are the same boiling mode and these film boiling modes are identical to the normal film boiling that occurs in common fluids. And the noisy film boiling in the He II is a kind of large-scale unstable phenomenon that generates the large oscillation in the heater temperature and the heat transfer coefficient, and it is the characteristic boiling mode in He II3) The boundary between the weakly subcooled and the noisy film boilings in He II exists just above λ-pressure. This boundary increases as the He II temperature decreases or the heat flux increases.

本文的主要研究结果如下：1）He Ⅱ在强过冷状态下，汽层很薄，汽层行为相对稳定。随着氦浴压力的降低，蒸气层的行为逐渐增强，相对稳定区域逐渐减小。而在He Ⅱ的弱过冷状态下，随着熔池压力的降低，蒸汽层的厚度增加。当压力接近λ-压力时，沸腾状态由稳定沸腾转变为不稳定沸腾。2）He Ⅱ中的过冷沸腾和无声膜沸腾是同一种沸腾模式，并且这些沸腾模式与普通流体中的正常膜沸腾模式相同。噪声膜沸腾是一种大尺度的不稳定现象，它引起加热器温度和传热系数的大幅度振荡，是He Ⅱ的特征沸腾模式。该边界随着He II温度的降低或热通量的增加而增加。

项目成果

Film Boiling Modes in Weakly Subcooled He II around Lambda Pressure

弱过冷 He II 中 Lambda 压力附近的薄膜沸腾模式

• 发表时间: 2005
• 期刊: Proc.of ICEC 20 (印刷中)
• 作者: M.Nozawa;N.Kimura;M.Murakami
• 通讯作者: M.Murakami

Variation of Subcooled Film Boiling State in HeII with the Pressure

氦气中过冷膜沸腾状态随压力的变化

• 发表时间: 2004
• 期刊: Adv.in Cryog.Eng. 49
• 作者: M.Nozawa;N.Kimura;M.Murakami
• 通讯作者: M.Murakami

He II中のλ点圧力近傍から飽和圧力における膜沸騰モードの変化

He II 中薄膜沸腾模式从近 λ 点压力到饱和压力的变化

• 发表时间: 2004
• 期刊: 低温工学 39
• 作者: 野澤 正和;村上 正秀;張 鵬;木村 誠宏
• 通讯作者: 木村 誠宏

Variation of the Film Boiling Mode in He II from the Vicinity of the Lambda Pressure down to the Saturated State

He II 中膜沸腾模式从 Lambda 压力附近到饱和状态的变化

• 发表时间: 2004
• 期刊: Teionkogaku Vol.39
• 作者: 野澤 正和;村上 正秀;張 鵬;木村 誠宏;Toshio Iseki;M.Nozawa et al.
• 通讯作者: M.Nozawa et al.

Variation of Subcooled Film Boiling State in He II with the Pressure

He II 中过冷膜沸腾状态随压力的变化

• 发表时间: 2004
• 期刊: Adv. in ayog. Eng. Vol.49
• 作者: 野澤 正和;村上 正秀;張 鵬;木村 誠宏;Toshio Iseki;M.Nozawa et al.;Toshio Iseki;M.Nozawa et al.
• 通讯作者: M.Nozawa et al.