Computational study of a 4 K two-stage pulse tube cooler with mixed Eulerian–Lagrangian method

✍ Scribed by Y.L. Ju

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 505 KB
• Volume: 41
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/s0011-2275(01)00047-9

✦ Synopsis

A new mixed Eulerian±Lagrangian numerical model for simulating and visualizing the internal processes and the variations of dynamic parameters of a two-stage pulse tube cooler (PTC) operating at 4 K temperature region has been developed. We use the Lagrangian method, a moving grid, to follow the exact tracks of gas particles as they move with pressure oscillation in the pulse tube to avoid any numerical false diusion. The Eulerian approach, a ®xed computational grid, is used to simulate the variations of dynamic parameters in the regenerator. A variety of physical factors, such as real thermal properties of helium, multi-layered magnetic regenerative materials, pressure drop and heat transfer in the regenerator, and heat exchangers, are taken into account in this model. The time-variations of gas temperature, pressure, mass ¯ow rate, enthalpy ¯ow in a cycle, in ®rst-and second-stage regenerators are presented in the paper. More attention is paid to the eects of dierent regenerative materials on the performance of the 4 K two-stage PTC.