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Cryocoolers 11 pp 371-379 | Cite as

Visualization of DC Gas Flows in a Double-Inlet Pulse Tube Refrigerator with a Second Orifice Valve

  • M. Shiraishi
  • K. Takamatsu
  • M. Murakami
  • A. Nakano
  • T. Iida
  • Y. Hozumi
Chapter

Abstract

We have observed the secondary flow induced in a double-inlet pulse tube refrigerator by using a smoke-wire flow visualization method and investigated the effects of the opening of the bypass valve on the flow behavior of the secondary flow, especially of the DC flow. Also, the effect of a second orifice valve on the secondary flow has been visually investigated. Based on the observations, the relationship between the cooling performance and the dynamic behavior of the secondary flow has been determined. It has been found that for the double-inlet pulse tube refrigerator, a DC flow is induced by opening the bypass valve, and that the DC flow is strengthened with additional opening of the valve. Further, the behavior of secondary flow in the pulse tube is well modeled as a superposition of the DC flow and the convection of acoustic streaming driven by the oscillating main flow. The valve opening for optimum cooling performance is found to be that that balances the DC flow and the acoustic streaming to reduce the net velocity of the secondary flow to zero in the core region of the pulse tube. Similarly, it is found for a double-inlet pulse tube refrigerator with a second orifice valve, that the optimum cooling performance again corresponds to near zero secondary flow in the core region.

Keywords

Mass Flow Rate Core Region Secondary Flow Valve Opening Pulse Tube 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • M. Shiraishi
    • 1
  • K. Takamatsu
    • 2
  • M. Murakami
    • 2
  • A. Nakano
    • 1
  • T. Iida
    • 3
  • Y. Hozumi
    • 4
  1. 1.Mechanical Engineering LaboratoryMITITsukuba, IbarakiJapan
  2. 2.University of TsukubaTsukuba, IbarakiJapan
  3. 3.National Space Development Agency of JapanTsukuba, IbarakiJapan
  4. 4.Chiyoda CorporationYokohamaJapan

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