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Study on thermodynamic process in pulse tube using molecular dynamics simulation.

Number: pap. n. 117

Author(s) : QI Y., PAN S., CHE Y., et al.

Summary

To explore the mechanism of temperature gradient establishment along the pulse tube, the oscillation flow of helium gas in the pulse tube with no regenerator and heat exchangers was studied using molecular dynamic simulations on NVE ensembles. The EAM/FS and UFF atomic potential was used for Fe and He atoms, respectively. The simulation results show that the temperature, pressure gradients are varied during a whole expansion process. The axial speed is varied from small to maximum quickly and then down to zero gradually by fluctuation. The phase of pressure is leaded to the speed by 72° at the hot end during the expansion process. The phase angle difference between the pressure and the speed waves is not changed with the tube length. The cold temperature after expansion is decreased with the increase of the tube length and the pressure ratio. From the energy efficiency, it should be circumspect to increase the pressure ratio.

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Pages: 8

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Details

  • Original title: Study on thermodynamic process in pulse tube using molecular dynamics simulation.
  • Record ID : 30025895
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.0117

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