Occurrence of Thermoacoustic Phenomena at 0.8 K, 4 K and above

[摘要] Thermoacoustics in cryogenics continues to be a very interesting phenomenon which is still poorly understood but often experienced unexpectedly in experiments where it causes unacceptable heat leaks. The authors report on the appearance and onset of this unwanted occurrence at temperatures below 35 K. A number of physical experiments are presented, where the authors had the means to take quantitative measurements of the heat leak caused by these pressure oscillations in apparatus with bent tubes ranging from 4.55 and 4.7 mm inner diameter, with heat stationing links. The parameters which indicate the likelihood of inadvertently developing these thermoacoustic oscillations are presented and means developed to avoiding them in that instance are given. Furthermore, we had the rare opportunity to record and analyze 4 K TAOs experienced on a test setup and present the simple method that was used to eliminate them.

[发布机构] Electromagnetics and Superconductivity Lab, GE Global Research, Niskayuna; NY; 12309, United States^1;Chemical Sensing Lab, GE Global Research, Niskayuna; NY; 12309, United States^2

[效力级别] 物理学 [学科分类] 材料科学（综合）

[关键词] Inner diameters;Physical experiments;Pressure oscillation;Quantitative measurement;SIMPLE method;Test setups;Thermoacoustic;Thermoacoustic oscillations