Thermodynamic characteristics of pumping line in nitrogen cryostat with narrow tail
✍ Scribed by X.N. Xu; X. Jin; Y.T. Zhang; J.C. Shen; X.X. Yao
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 505 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0011-2275
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✦ Synopsis
This paper describes the structure of a nitrogen cryostat with a narrow tail used for electromagnetic measurements, and the experimental and theoretical results of its characteristic thermodynamic parameters such as the refrigerating temperature and the pressure in the pumping line. The conductance equations relating pressure drop and mass flow rate for laminar continuous flow in a circular and annular flow tube, and the vapour pressure equations of liquid and solid nitrogen are used to calculate the parameters of the pumping line. An analytical method is depicted to provide theoretical guidance for designing this sort of cryostat so as to obtain as low a working temperature as possible. According to the experimental data and theoretical calculations, lowering the surface pressure of solid nitrogen leads to the lowest working temperature of the nitrogen cryostat with a narrow tail, which is =45 K.