The inertance type pulse tube refrigerator (IPTR) has been extensively used in industries due to its small size and efficiency. The physical phenomena of oscillating flow in IPTR is complex and it can be examined by using a commercial computational fluid dynamics (CFD) software. Researchers are not so much interested in the 3D analysis of IPTR due to high computational time but for better visualization, it is very beneficial. A two-dimensional axis-symmetric model and 3D model is considered for simulation. The temperature at the cold heat exchanger (CHX) and phase difference between pressure and mass flow rate at CHX is demonstrated. In this paper, CFD analysis of IPTR has been done and various issues involved in the simulation are presented for the betterment in the desired solution.
Stirling machines are ecologically propitious refrigeration devices that utilize natural gases like helium, nitrogen, or air. Stirling machines are active refrigerators that should be designed with minimal vibrations and durability in order to fulfil current and future commercial de-mands and requirements. The present paper deals with the modification of the inertance pulse tube refrigerator in which the reservoir is eliminated and replaced with another pulse tube refrigerator. These two pulse tube refrigerators are operated at 180 degrees out of phase, called counter-flow pulse tube refrigerators (CFPTR). The second-order cyclic analysis approach is used to develop a mathematical model for evaluating the performance of CFPTR. This paper describes a modified second-order cyclic approach in detail. The performance of CFPTR is evaluated by estimating the ideal refrigerating effect, ideal power input, and losses individual-ly, yielding net power input and net refrigerating effect. The net refrigerating effect of 30.88W at 70K is obtained with the percentage of Carnot COP of 13.71. The CFD modeling of CFPTR is used to corroborate the second order cyclic model.
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