Prototypical cryocooler regenerators were assembled with several common regenerator filler materials and were tested under periodic helium flow at room and cryogenic temperatures. The mass flow and pressure drop data were analysed to determine the friction factor, Darcy Permeability and Forchheimer coefficients. The results are compared to previous investigations, and the relevance of room-temperature models and correlations to cryogenic temperatures is assessed. It is shown that within the range of parameters tested, room-temperature hydrodynamic parameters such as friction factor can be used at cryogenic temperatures. Empirical correlations with improved accuracy are developed for the friction factor for each of the tested filler materials.

原型低温冷却器蓄热器由几种常见的蓄热器填充材料组装而成，并在室温和低温下在定期氦流下进行测试。分析质量流量和压降数据以确定摩擦系数、达西渗透率和 Forchheimer 系数。将结果与之前的调查进行比较，并评估室温模型的相关性和与低温的相关性。结果表明，在测试的参数范围内，室温流体动力学参数如摩擦系数可以在低温下使用。为每种测试的填充材料的摩擦系数开发了具有更高准确性的经验相关性。