Thermodynamic Property Of Helium-3 And Pulse Tube Refrigeration With Helium-3 And Helium-4 Mixtures

~3He, as a special substance, is now having more and more applications in the field of cryogenic engineering, fundamental physics and space technology, etc. And these applications need reliable thermodynamic property of ~3He. However, the experimental data of ~3He are extremely shortage. In addition, there has not any state equation in wide range for ~3He so far, which brings researchers inconvenience. This paper is on the thermodynamic property of ~3He and pulse tube refrigeration with helium-3 and helium-4 mixtures. The specific tasks are as follows:1. Sufficient reference and different types of data have been collected into a searchable database, which is very important and convenient for the further research on ~3He.2. Computer programs are compiled to check the feasibility of v-T relationship using five normal state equations from 4K~100K, and compares the calculated data with the experimental data, which make valuable reference for the research of the state equation of ~3He.3. Thermodynamic Model of helium-3 is set up using modified quantum version principle of corresponding states. It is proved to be very accurate when the calaulated p-v-T data compared with experimental data when temperature is higher than 12K.4. Pulse Tube Refrigeration with helium-3 and helium-4 Mixtures is computed using the modified-Brayton cycle. The result shows that a higher cooling power and coefficient of performance(COP) can be obtained by means of mixtures than that only using helium-4.In the end, the paper gives the summary and forward of the study.