Abstract
The flow behavior inside a basic and an orifice pulse tube refrigerator has been observed during one compression-expansion cycle by means of a smoke-wire flow visualization technique. The pulse tube was operated with a comparatively large pressure amplitude, and the velocity profiles and displacements of the working gas were observed at the cold end, at the middle of the pulse tube, and at the hot end. The suction and blowout of the working gas between the hot end of the pulse tube and the reservoir was also observed.
The orifice pulse tube has larger velocities and displacements as compared to the basic pulse tube. The velocity oscillation in the basic pulse tube is mainly governed by the rate of increase (decrease) of pressure in the pressure oscillation, i.e. dP/dt. On the other hand, in the case of the orifice pulse tube, in addition to dP/dt, the pressure difference between the pulse tube and reservoir also has a large effect on the velocity oscillation. Typical velocity profiles of viscous oscillating flow are observed in the beginning of both processes. Moreover, the existence of a secondary flow is observed and its velocity is estimated.
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Shiraishi, M., Nakamura, N., Seo, K., Murakami, M. (1997). Visualization Study of Velocity Profiles and Displacements of Working Gas Inside a Pulse Tube Refrigerator. In: Ross, R.G. (eds) Cryocoolers 9. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-5869-9_42
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DOI: https://doi.org/10.1007/978-1-4615-5869-9_42
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