Radial Temperature and Velocity Profiles of Oscillating Flows in a Pulse Tube Refrigerator

Abstract

This chapter focuses on the radial temperature and velocity profiles of oscillating flows in a pulse tube refrigerator to clear the differences of the performance depending on the type of a pulse tube refrigerator. It tests three types of pulse tube refrigerators, a basic type, an orifice, and a double inlet types. It measures the radial temperature and the velocity profiles, and provides the estimate of the radial distribution of the local work by obtaining the local area of P-V diagram from the velocity profiles. The distribution of the local work is different among three types. In the basic type, the radial profile of the local work that has the maximum value near the wall is strongly affected by the phase difference, and the local work is two order smaller than other types. In the orifice type, the local work increases with the distance from the wall to the center line of the pulse tube. In the double inlet type, the radial profile of the local work is almost fiat except near the wall. This chapter concludes by discussing the cause of differences on the performance.