Suppression of acoustic streaming in tapered pulse tubes

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Description

In a pulse tube cryocooler, the gas in the pulse tube can be thought of as an insulating piston, transmitting pressure and velocity from the cold heat exchanger to the hot end of the pulse tube. Unfortunately, convective heat transfer can carry heat from the hot end to the cold end and reduce the net cooling power. Here, the authors discuss one driver of such convection: steady acoustic streaming as generated by interactions between the boundary and the oscillating pressure, velocity, and temperature. Using a perturbation method, they have derived an analytical expression for the streaming in a tapered pulse ... continued below

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8 p.

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Olson, J.R. & Swift, G.W. December 31, 1998.

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Description

In a pulse tube cryocooler, the gas in the pulse tube can be thought of as an insulating piston, transmitting pressure and velocity from the cold heat exchanger to the hot end of the pulse tube. Unfortunately, convective heat transfer can carry heat from the hot end to the cold end and reduce the net cooling power. Here, the authors discuss one driver of such convection: steady acoustic streaming as generated by interactions between the boundary and the oscillating pressure, velocity, and temperature. Using a perturbation method, they have derived an analytical expression for the streaming in a tapered pulse tube with axially varying mean temperature in the acoustic boundary layer limit. The calculations showed that the streaming depends strongly on the taper angle, the ratio of velocity and pressure amplitudes, and the phase between the velocity and pressure, but it depends only weakly on the mean temperature profile and is independent of the overall oscillatory amplitude. With the appropriate tapering of the tube, streaming can be eliminated for a particular operating condition. Experimentally, the authors have demonstrated that an orifice pulse tube cryocooler with the calculated zero-streaming taper has more cooling power than one with either a cylindrical tube or a tapered pulse tube with twice the optimum taper angle.

Physical Description

8 p.

Notes

INIS; OSTI as DE99000745

Source

  • 10. international cryocooler conference, Monterey, CA (United States), 26-28 May 1998

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  • Other: DE99000745
  • Report No.: LA-UR--98-2013
  • Report No.: CONF-980541--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 304116
  • Archival Resource Key: ark:/67531/metadc688861

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  • December 31, 1998

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Feb. 26, 2016, 6:34 p.m.

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Olson, J.R. & Swift, G.W. Suppression of acoustic streaming in tapered pulse tubes, article, December 31, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc688861/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.