液氦温区Ｇ—Ｍ型制冷机冷头换热器的分析与讨论中国科学院低温技术实验中心龚领会，张亮由于小型回热式气体制冷机的结构限制，制冷机冷头换热器的传热面积通常比较小，且其传热机制为单相流体的对流换热。因此，冷头换热器的ＮＴＵ值较小，这就使得这类制冷机只能允许输... Analysis and discussion of cold head heat exchanger of G-M refrigerator with liquid helium temperature Gong Linghui, Zhang Liang Due to the structural limitations of small recuperative gas refrigerator, the cold head heat exchanger of refrigerator The heat transfer area is usually small, and the heat transfer mechanism is the convective heat transfer of the single-phase fluid. Therefore, the cold head heat exchanger NTU value is smaller, which makes this type of refrigerator can only allow ...