Conveners
C3Po1D: Non-Aerospace Coolers VI: Stirling and Pulse Tube Coolers
- Carl Kirkconnell (West Coast Solutions)
- Ray Radebaugh (NIST)
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46. C3Po1D-02: Study on heat transfer characteristics of regenerator under different Valensi numbersYu Fangqiu (Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)12/07/2023, 09:15Poster
The heat transfer characteristics of regenerator in regenerative coolers such as pulse tube and Stirling coolers is important. Various methodologies of characterizing the Nusselt number between the regenerator matrix and working fluid have been established and applied. However, most of the existing formulas are based on the results of steady-state flow or low-frequency oscillating flow. In...
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ZeKun Wang12/07/2023, 09:15Poster
In a pulse tube refrigerator, the multi-bypass structure establishes a gas channel in the radial direction between the pulse tube and the regenerator. In the experiment, it was observed that the flow area of the gas channel had a significant impact on the performance of the pulse tube refrigerator and that there exists an optimal flow area that drives the cold head to reach the minimum...
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Bokeum Kim (KAIST)12/07/2023, 09:15Poster
Design of two-stage Stirling cryocooler with a unique long second expansion space volume is proposed to effectively reduce the displacer length and mass. The thermodynamic performance of this cooler which is similar to a pulse tube cryocooler with the warm-end expander is investigated by the numerical analysis. The long expansion space at the second stage behaves as a pulse tube with a...
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Dr Liubiao Chen (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)12/07/2023, 09:15Poster
With the improvement of passive thermal insulation technology, the heat leakage of cryogenic storage tanks has been effectively reduced. However, with the growth of storage time, the accumulation of heat leakage inevitably makes the liquid in the tank continuously gasification, resulting in the quality loss of the liquid. Zero-boil-off storage systems, which generally use cryocoolers to...
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Mr Yibing Zhang (Lihan Cryogenics)12/07/2023, 09:15Poster
Pulse tube cooler has the advantages of higher reliability and longer MTTF compared with Stirling cooler due to the elimination of moving components at the cold end. Pulse tube cooler working in the liquid hydrogen temperature region has already become a strong candidate in the fields of space science and high-temperature superconductivity. However, the current efficiency of the pulse tube...
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Chushu Fang12/07/2023, 09:15Poster
A three-stage pulse tube cryocooler driven by 500W Stirling compressor is built and tested. To improve the phasing capability of the system, a double-inlet structure is introduced between the hot end heat exchanger and the pulse tube at all stages. In this paper, a simulation study and experimental verification of the reasonable opening of the double-inlet are carried out, and the reasons for...
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Dr Biao Yang (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)12/07/2023, 09:15Poster
Limited by real gas effects which stick out in the critical temperature range, it is a challenge for high-frequency pulse tube cryocoolers to obtain the liquid helium temperature or blow. The influence of real gas effects on the cold-end refrigeration performance of a low-temperature regenerator working in the liquid-hydrogen to liquid-helium temperature ranges was investigated primarily by...
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