Regenerator behavior at 4 K: Effect of volume and porosity
Regenerator behavior at 4 K: Effect of volume and porosity
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DOI：
10.1063/1.1472117
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发表时间：
2002-05
期刊：
影响因子：
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通讯作者：
R. Radebaugh;A. O'Gallagher;J. Gary
中科院分区：
文献类型：
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作者：
R. Radebaugh;A. O'Gallagher;J. Gary
再生材料在4 K附近的低热容量和氦在该温度下的真实气体性质导致了在更高温度下看不到的异常温度分布和行为。本文描述了根据NIST计算机代码REGEN3.2计算的蓄热器在冷端温度为4 K时的行为。结果表明：在较宽的范围内，再生器损失与再生器体积无关，在体积减小到某一临界值以下时，再生器损失才会迅速增加。当热端气体位移幅值接近蓄热器长度时，发生相变。模型表明，降低孔隙率可以降低高原上的再生器损失。文中还讨论了热端温度和基体热容对蓄热器损失的影响。计算的温度分布与4 K吉福德-麦克马洪制冷机蓄热器的实验测量值一致。
The low heat capacity of regenerator materials near 4 K and the real gas properties of helium at this temperature give rise to anomalous temperature profiles and behavior not seen at higher temperatures. This paper describes the behavior of regenerators calculated from the NIST computer code REGEN3.2 when the cold end is at 4 K. The results show that the regenerator loss is independent of the regenerator volume over a wide range and does not increase until the volume is decreased below some critical value, at which point the loss increases very rapidly. The transition occurs when the gas displacement amplitude at the warm end approaches the length of the regenerator. The model shows that reducing the porosity leads to a decreased regenerator loss at the plateau. The paper also describes the effect of the temperature at the warm end and the matrix heat capacity on the regenerator loss. The calculated temperature profiles agree with experimental measurements on regenerators in 4 K Gifford-McMahon refrigerators.