Tapered pulse tube for pulse tube refrigerators

Details Tapered pulse tube for pulse tube refrigerators Tapered pulse tube for pulse tube refrigerators

1997-11-21

1999-09-21

Capossela, Ronald

Refrigeration

Gas compression, heat regeneration and expansion, e.g.,...

60520, F25B 900

Patent

active

059539208

ABSTRACT:
Thermal insulation of the pulse tube in a pulse-tube refrigerator is maintained by optimally varying the radius of the pulse tube to suppress convective heat loss from mass flux streaming in the pulse tube. A simple cone with an optimum taper angle will often provide sufficient improvement. Alternatively, the pulse tube radius r as a function of axial position x can be shaped with r(x) such that streaming is optimally suppressed at each x.

REFERENCES:
patent: 3314244 (1967-04-01), Green
patent: 5165243 (1992-11-01), Bennett
patent: 5319938 (1994-06-01), Lucas
Nikolaus Rott, "The Influence of Heat Conduction on Acoustic Streaming," Journal of Applied Mathematics and Physics (ZAMP), vol. 25, pp. 417-421, 1974.
Ray Radebaugh, "A Review of Pulse Tube Refrigeration," Cryogenic Engineering Conference, pp. 1-14, 1989.
J. M. Lee, P. Kittel, K. D. Timmerhaus, R. Radebaugh, "Flow Patterns Intrinsic to the Pulse Tube Refrigerator," National Institute of Standards and Technology, pp. 125-139, 1993.

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