Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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CFD Simulation of thermoacoustic oscillations in liquid helium cryogenic system

  • wang, xianjin (College of Petrochemical Engineering, Lanzhou University of Technology) ;
  • niu, xiaofei (Institute of Modern Physics Chinese Academy of Sciences) ;
  • bai, feng (Institute of Modern Physics Chinese Academy of Sciences) ;
  • zhang, junhui (Institute of Modern Physics Chinese Academy of Sciences) ;
  • chen, shuping (College of Petrochemical Engineering, Lanzhou University of Technology)
  • Received : 2020.11.24
  • Accepted : 2021.03.18
  • Published : 2021.03.31
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Abstract

Thermoacoustic oscillations (TAOs) could be often observed in liquid helium cryogenic system especially in half-open tubes. These tubes have closed warm end (300K) and open cold end (usually 4.4K). This phenomenon significantly induces additional heat load to cryogenic system and other undesirable effects. This work focuses on using computational fluid dynamics (CFD) method to study TAOs in liquid helium. The calculated physical model, numerical scheme and algorithm, and wall boundary conditions were introduced. The simulation results of onset process of thermoacoustic oscillations were presented and analyzed. In addition, other important characteristics including phase relation and frequency were studied. Moreover, comparisons between experiments and the CFD simulations were made, which demonstrated thevalidity of CFD simulation. CFD simulation can give us a better understanding of onset mechanism of TAOs and nonlinear characteristics in liquid helium cryogenic system.

Keywords

Acknowledgement

This study was supported by Gansu Natural Science Foundation (Grant No.20JR5RA553).

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