Piston Resonance in the Orifice Pulse Tube

P C T de Boer (1) , Jean-Marc Duval (1, 2, 3, 4) , I Charles (1, 4) , L. Duband (1, 4)

1 CEA - Commissariat à l'énergie atomique et aux énergies alternatives
2 DRFMC - Département de Recherche Fondamentale sur la Matière Condensée
3 SBT - Service des Basses Températures
4 LCCS - Laboratoire des Cryoréfrigérateurs et Cryogénie Spatiale

The force exerted on the piston of a linear motor driving an orifice pulse tube is analyzed using linearized theory. First, the case of a pulse tube without orifice and reservoir is considered. It is found that there are two possible resonances, corresponding to a very small and a very large orifice conductance, respectively. In principle, such resonances can be used to reduce the current provided to the linear motor, and hence to reduce the associated ohmic losses. There is no resonance of the power provided to the pulse tube. An expression is derived for the dissipation in the tube chambers associated with heat losses to the wall. Experimental results obtained for the phase angle and the amplitude of the piston force indicate that there is a large influence of turbulent effects on thermal diffusivity. The analysis is extended to the case with regenerator. It is found that dissipation as well large temperature ratios across the regenerator tend to decrease the piston resonance effect.

Domaines: Thermique [physics.class-ph]

P C T de Boer, Jean-Marc Duval, I Charles, L. Duband. Piston Resonance in the Orifice Pulse Tube. Cryocoolers, 2002, pp.265-274. ⟨10.1007/0-306-47919-2_36⟩. ⟨hal-02572808⟩