Nitrogen Heat Pipe for Cryocooler Thermal Shunt
Nitrogen Heat Pipe for Cryocooler Thermal Shunt
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DOI：
10.1007/978-1-4613-0373-2_19
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发表时间：
1995-09
期刊：
影响因子：
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通讯作者：
F. Prenger;D. Hill;D. Daney;M. Daugherty;G. Green;E. Roth
中科院分区：
文献类型：
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作者：
F. Prenger;D. Hill;D. Daney;M. Daugherty;G. Green;E. Roth
设计、制造并测试了一种氮气热管，用于在冷却期间在Gifford-McMahan（GM）制冷机的两级之间提供热分流。氮热管的工作温度范围在63至123 K之间。当热管在系统冷却期间处于该温度范围内时，其充当低温冷却器的第一和第二级之间的热分流器。热管增加了到制冷机第一级的热传递，从而减少了系统的冷却时间。当热管温度下降到三相点以下时，氮气工作流体冻结，有效地停止热管运行。由于沿热管壁沿着的轴向传导，在制冷机级之间存在小的热泄漏。只要热管保持低于63 K，热管就保持不活动。测量了热管的性能极限，并确定了最佳流体填充量。
A nitrogen heat pipe was designed, built and tested for the purpose of providing a thermal shunt between the two stages of a Gifford-McMahan (GM) cryocooler during cooldown. The nitrogen heat pipe has an operating temperature range between 63 and 123 K. While the heat pipe is in this temperature range during the system cooldown, it acts as a thermal shunt between the first and second stage of the cryocooler. The heat pipe increases the heat transfer to the first stage of the cryocooler, thereby reducing the cooldown time of the system. When the heat pipe temperature drops below the triple point, the nitrogen working fluid freezes, effectively stopping the heat pipe operation. A small heat leak between cryocooler stages remains because of axial conduction along the heat pipe wall. As long as the heat pipe remains below 63 K, the heat pipe remains inactive. Heat pipe performance limits were measured and the optimum fluid charge was determined.