Abstract
Orifice pulse tube refrigerators reject heat and alter phase through fluid flows at the warm end of the pulse tube. Work otherwise wasted in the orifice can be put to use in a novel device based upon the principle of the Ranque/Hilsch vortex tube. By separating flows in both directions into hot and cold streams, and rejecting heat from the hot streams, enhanced heat rejection can be accomplished. A shell of hot fluid rotating rapidly in the bore of the vortex tube ensures effective heat exchange from each hot stream. Impedance of a double vortex tube controls flows as would an orifice. Reduction in fluid temperature at the warm end of the pulse tube reduces conduction losses and improves overall efficiency of the system. Preliminary experiments indicate that the double vortex tube works. Some issues in optimization of the double vortex tube as a component of a pulse tube refrigerator system are discussed.
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