A numerical simulation method of a two-stage G-M refrigerator and comparison with experiment

An improved numerical model and calculation method to simulate the dynamic process of a two-stage G-M refrigerator has been developed in this paper. A variety of factors, such as variable properties of regenerator materials and helium, existence of helium in a void space of a regenerator, were taken into account in the model. It can predict the distributions of temperature and mass flow, respectively with time, in the first and second stage regenerators, the regenerator efficiency and refrigeration capacity. Some analyses are made to study the effects of some parameters on refrigerator performance. The values predicted by computing agree with experimental results. The numerical method can provide useful information for the design of a high efficiency refrigerator.