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Use of Gas Column Stratification Model to Calculate Closed-Cycle Cryogenic Machines

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Chemical and Petroleum Engineering Aims and scope

The article describes a physical model of gas column stratification, which is used for modeling real thermodynamic processes in closed-cycle cryogenic gas machines. Particularly machines having a pulse- tube refrigerator operating on Stirling cycle are studied. The high efficiency of such machines is associated with low vibration level at the cold end of the cryogenic head and with significant increase of operating life compared to cryogenic gas machines having a physical displacer. Examples of calculations using this model and the obtained results are given. For estimation of the efficiency of the machines, it is proposed to use two new diagrams — evolution of phases and resource intensity, instead of the classical Schmidt diagram. The model can be used to determine, as a first approximation, the optimum volumetric design of the cryogenic machine, its thermodynamic characteristics, such as power, refrigerating capacity, efficiency, etc., as well as the possibility for calculation of the change in phase characteristics of thermodynamic processes for user-assigned factors, taking account of the unsteady process of transition to conditions with initialization of two types — real and imaginary. Among the user-assigned factors, mention should be made of hydraulic resistance of the apparatuses, Nusselt number, effective thermal conductivity, and ambient temperature.

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Authors and Affiliations

  1. A. E. Nudelman Precision Engineering Design Bureau JSC, Moscow, Russia

    V. A. Chekhovich

  2. Bauman Moscow State Technical University, Moscow, Russia

    E. S. Navasardyan

Authors
  1. V. A. Chekhovich
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  2. E. S. Navasardyan
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Correspondence to V. A. Chekhovich.

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Translated from Khimicheskoe i Neftegazovoe Mashinostroenie, Vol. 58, No. 12, pp. 8–13, December, 2022.

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Chekhovich, V.A., Navasardyan, E.S. Use of Gas Column Stratification Model to Calculate Closed-Cycle Cryogenic Machines. Chem Petrol Eng 58, 998–1011 (2023). https://doi.org/10.1007/s10556-023-01192-7

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  • DOI: https://doi.org/10.1007/s10556-023-01192-7

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