An apparatus for simultaneous measurements of heat capacities and pressure coefficients was designed and constructed for experimental studies of critical phenomena near the lambda points of liquid He 4 and He 3 -He 4 mixtures. The pressure was measured with a capacitance pressure sensor involving a
Heat capacities of 3He and 4He in one- and three-dimensional channels
โ Scribed by Hiroyuki Deguchi; Kensuke Konishi; Kazuyoshi Takeda; Norikiyo Uryu
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 199 KB
- Volume
- 165-166
- Category
- Article
- ISSN
- 0921-4526
No coin nor oath required. For personal study only.
โฆ Synopsis
Thermal properties of 3He and 4He adsorbed in high-silica zeolites have been studied in the temperature range 0.8-10 K for various helium concentration. In the case of ZSM-23 having one-dimensional(l-d) channels, helium behaves as a semi-quantum liquid. In ZSM-5 with three-dimensional(3-d) channel structure, the heat capacity of helium shows a characteristic shoulder around 2 K. This seems to be due to the motion of helium atoms channels in ZSM-5.
๐ SIMILAR VOLUMES
Helium-3 nuclear spin relaxation times T1, T2, and Tip have been measured for 3He-4He solid mixtures at the exchange plateau region (~ O. 5 K). The 3He concentrations x3 of the samples were 7.2, 2.9, 1.8, 1.4, 0.67, 0.65, and 0.22 %, and their molar volumes varied between 19.9 and 20.9 cm3 /mole in
Heat transfer and fluid flow of He II in a long, narrow channel connected to a bath that supplies a constant supply of heat have been investigated by numerical simulations by using the simplified model of Kitamura et al. [Cryogenics 37 (1) (1997) 1]. Such channels are used to cool compact, stable, l