Dynamical Properties of the Phase-Separation Interface of ^3He-^4He Liquid Mixture.

^3He-^4He 液体混合物相分离界面的动力学性质。

• 批准号: 11640364
• 负责人: SATOH Takeo
• 金额: $ 2.24万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11640364/
• 关键词: ^<3->He-^<4->He liquid mixture; phase-separation interface; kinetic growth coefficient; quantum nucleation; ultrasonic; energy dissipation; nucleation; 相分離現象

In the study of nucleation phenomena in supersaturated super fluid ^3He-^4He mixtures, we recognized the importance of the dynamical behavior of the interface between the nucleus and the surrounding liquid mixture, that is, the growth coefficient of the interface.Our present experiment aimed at getting the temperature dependence of the growth coefficient. For that purpose, we took a way to measure the transmission coefficient of sound(10MHz)through the interface. Because of the very large attenuation of sound in ^3He-^4He mixtures, we developped a method in which the position of the interface can be changed continuously.The main parts of our results are ; (1)the growth coefficient starts increasing below about 70mK and, the temperature dependence is approximately 1/T^2, (2)the magnitude of the growth coefficient is much larger than expected from the consideration in a hydrodynamic regime, for example, at 10mK the difference is a factor of 10^3. These results are very important for our understanding of the nucleation phenomena, especially in the region of quantum nucleation accompanied with energy dissipation.

在研究过饱和超流^3He-^4He混合物中的核化现象时，我们认识到核与周围液体混合物界面动力学行为的重要性，即界面的生长系数，本实验旨在得到生长系数的温度依赖性。为此，我们采取了一种方法来测量声音（10 MHz）通过接口的传输系数。由于^3He-^4He混合气体中的声衰减很大，我们发展了一种连续改变界面位置的方法。（1）生长系数在低于约70 mK时开始增加，温度依赖性约为1/T^2，（2）增长系数的大小比在流体动力学条件下所考虑的要大得多，例如，在10 mK时，差异是10^3倍。这些结果对于我们理解成核现象，特别是在伴随能量耗散的量子成核区域中的成核现象是非常重要的。

项目成果

S.N.Burmistrov: "On the structure of quantized vortices in a saturated liquid ^3He-^4He mixture"Physica B. 284-288. 321-322 (2000)

S.N.Burmistrov：“关于饱和液体 ^3He-^4He 混合物中量子化涡旋的结构”Physica B. 284-288。

S.N.Burmistrov: "The effect of the sound modes on the quantum nucleation in a supersaturated superfluid ^3He-^4He mixture"Physica B. 262. 226-232 (1999)

S.N.Burmistrov：“声音模式对过饱和超流体 ^3He-^4He 混合物中量子成核的影响”Physica B. 262. 226-232 (1999)

S.N.Burmistrov: "Quantized vortices beside the superfluid-normal interface "Journal of Low Temperature Physics. 121. 399-404 (2000)

S.N.Burmistrov：“超流体-法线界面旁边的量子化涡旋”《低温物理学杂志》。

S.N.Burmistrov and T.Satoh: "The effect of the sound modes on the quantum nucleation in a supersaturated ^3He-^4He mixture"Physica B. 262. 226-232 (1999)

S.N.Burmistrov 和 T.Satoh：“声音模式对过饱和 ^3He-^4He 混合物中量子成核的影响”Physica B. 262. 226-232 (1999)

S.N.Burmistrov: "Tangential instability of the superfluid-normal interface in a phase-separated ^3He-^4He liquid mixture"Physica B. 284-288. 329-330 (2000)

S.N.Burmistrov：“相分离的 ^3He-^4He 液体混合物中超流体-法线界面的切向不稳定性”Physica B. 284-288。