Performance and Internal Process of a 4 K GM Cooler
A numerical simulation of 4 K GM cooler, which takes into account properties of real gas and magnetic regenerative material as well as heat transfer in the heat exchanger and regenerator, has been developed. The source code of NIST12 helium database is incorporated within the simulation program. The predicted temperature profiles along the regenerator are in reasonable agreement with experimental data. Predictions show some features in the low temperature regenerator, such as a flat temperature region, increased mass flow rate at cold end and a part of the helium fluid never leaving the regenerator. Optimization of structure parameters deals with the effects of the displacer phase as well as the length and porosity of regenerator on the cooling performance.
KeywordsMass Flow Rate Liquid Helium Temperature Cooling Power Cooling Performance Cold Head
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