Prediction of the compression ratio of a Holweck-type molecular pump with the presence of multi-component gases using a modified Sickafus method for high-speed rotors

Yousefi-Nasab, Sadegh; Safdari, Jaber; Karimi-Sabet, Javad; Khajenoori, Masoud

doi:10.1016/j.vacuum.2019.109056

Cited by 8 publications

(2 citation statements)

References 15 publications

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“…The excessive pressure in the front stage would lead to unstable operation of the molecular pump. Sadegh et al [ 22 ] established a simulation model for the compression stage rotor of a compound molecular pump based on the Monte Carlo method. When the shape of the spiral groove cross-section was rectangular, semi-circular, semi-elliptical, and composite-shaped, the compression ratio performance in different concentrations of gas environments was analyzed.…”

Section: Introductionmentioning

confidence: 99%

Study on the Pumping Performance and Structure Parameters Optimization of High-Speed Small Compound Molecular Pump

Chen,

Zhang,

et al. 2024

Micromachines

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A molecular pump is the core component of vacuum systems in portable mass spectrometers and other analytical instruments. The forms of the existing molecular pumps mainly are the combinations of vertical bleed and compression channel, which have the shortcomings of heavy mass and large volume, which seriously restricts the application and development of portable mass spectrometers. Aiming at the problems of low strength and insufficient pumping performance under the miniaturization constraints (mass of 1.8 kg; exhaust diameter of 25 mm) of molecular pumps, a compound pump consisting of a horizontal bleed channel and multi-stage spiral compression channel is proposed. The pumping principle of the compound molecular pump is analyzed to obtain its preliminary structural size parameters. The test particle Monte Carlo method is presented for establishing an aerodynamic model for a high-speed small compound molecular pump, which can be used to investigate the pumping performance of bleed blades and compression channels in a thin air environment. On the basis of the aerodynamic model, the NNIA multi-objective optimization algorithm is presented to optimize the structural parameters of the compound molecular pump. After structural parameter optimization, the maximum flow rate and compression ratio of the compound molecular pump are increased by 13.6% and 41.6%, respectively. The experimental results of the pumping performance show that the predicted data of the aerodynamic model are in good agreement with the experimental data, with an error of 12–27%. Namely, the established aerodynamic model has high accuracy and the optimized structural parameters of the compound molecular pump can provide basic conditions for the large-scale application and promotion of portable mass spectrometers.

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Section: Introductionmentioning

confidence: 99%

Study on the Pumping Performance and Structure Parameters Optimization of High-Speed Small Compound Molecular Pump

Chen,

Zhang,

et al. 2024

Micromachines

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“…The main part of an isotope separation plant is a separating element in which the feeding material is fractionated to be enriched in the desired and depleted isotopes in the head and tail sections respectively. The centrifuge is one of the most important separating elements that countercurrent flow profile establishes in it and plays an important role in separation isotopes [1][2][3][4][5]. The operational functions of the gas centrifuge play an important role in the cascade behavior and many investigations have been published in this field [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

A new algorithm for simulation of the functional symmetric and asymmetric cascades

Norouzi

Khajenoori

Safdari

et al. 2021

NEP

Self Cite

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Design of cascade based on operational functions of a single machine is an important goal in the isotope separation theory. By recognizing the behavior of gas in a centrifuge machine, a cascade with desirable properties and parameters can be designed. In the classical theory of multistage separation installation, it has been shown that in an ideal cascade (no mixing) the total number of separation elements flow is minimal, and accordingly, the maximum separation work unit (SWU) of the cascade occurs. In the practical form, the cut and separation factors may assume to be dependent on the feed flow. Using specific functional parameters, the algorithm, design the functional cascades (DFUNCAS), can design the functional symmetric and asymmetric cascades. DFUNCAS can design a cascade with stated waste and product concentration. Furthermore, the program can design symmetric and asymmetric cascades. In this work, four test cases were considered and the results show that the DFUNCAS can design any kind of cascade accurately.

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Study of scoop drive and polymeric surface effects on the separation factors for a gas centrifuge using MD-DSMC method

Yousefi-Nasab

Safdari

Karimi-Sabet

et al. 2021

J Braz. Soc. Mech. Sci. Eng.

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Prediction of the compression ratio of a Holweck-type molecular pump with the presence of multi-component gases using a modified Sickafus method for high-speed rotors

Cited by 8 publications

References 15 publications

Study on the Pumping Performance and Structure Parameters Optimization of High-Speed Small Compound Molecular Pump

Study on the Pumping Performance and Structure Parameters Optimization of High-Speed Small Compound Molecular Pump

A new algorithm for simulation of the functional symmetric and asymmetric cascades

Study of scoop drive and polymeric surface effects on the separation factors for a gas centrifuge using MD-DSMC method

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