The local flow behavior inside an orifice and a double-inlet pulse tube refrigerator has been observed during a cycle by using a smoke-wire and a tuff flow visualization technique. To clarify the difference between an orifice and a double-inlet configuration, the flow behavior in the bypass tube of the double-inlet configuration has been carefully observed. The results are classified into six flow patterns and percentile plots of those flow patterns during the cycle. From these plots, the effects of opening of the bypass valve on the pulse tube performance has been observed, and the optimum conditions defined.
It is found that the flow in the bypass is similar to a typical viscous oscillating flow and its velocity is roughly one order faster than in the pulse tube. It is also found that there is a significant difference in the percentile plot between the orifice and the double-inlet configuration. For the double-inlet configuration, optimum conditions are distinguishable from other conditions by the fact that the duration times of some of the flow patterns increase significantly.
Visualization Study of the Local Flow Field in an Orifice and Double-Inlet Pulse Tube Refrigerator
Cryocoolers 10 ; Chapter : 39 ; 329-336
2002-01-01
8 pages
Article/Chapter (Book)
Electronic Resource
English
Visualization Study of the Local Flow Field in an Orifice and Double-Inlet Pulse Tube Refrigerator
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