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Stirling type pulse tube cryocoolers (SPTC), typically operating at 30–60Hz, have the advantage of compact structure, light weight, and long life compared with Gifford–McMahon type (1–2Hz) PTC (GMPTC). The behavior of flow and heat transfer in the regenerator of a 4K SPTC deviates from that at warmer temperatures and low frequencies. In this paper the behavior of 4K regenerator at high frequencies...
The losses in the regenerator are minimized when the amplitude of the mass flow is minimized for a given acoustic power which requires that the mass flow lags the pressure by about 30° at the cold end of regenerator. The phase shift provided by an inertance tube is strongly influenced by the temperature of the inertance tube and the acoustic power at the cold end of the regenerator. For a 4K Stirling...
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