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Results of a three evaporator cryogenic helium Pulsating Heat Pipe

机译：三蒸发器低温氦气脉动热管的结果

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Highlights•A three stage helium Pulsating Heat Pipe (PHP) has been successfully operated.•Fill ratios ranging from 20% to 90% were tested.•PHP’s temperature and pressure frequencies of 1.2 Hz were observed.•More than 2000 test runs were performed.•An optimal thermal performance of 50 kW/m-K was achieved at a fill ratio of 69.5%.AbstractA three stage Pulsating Heat Pipe has been successfully operated using helium as the working fluid at fill ratios ranging from 20% to 90%. More than 2000 test runs were performed and results showed that an optimal thermal performance was achieved at a fill ratio of 69.5%, producing a maximum effective thermal conductivitykeffaround 50,000 W/m-K. The PHP was operated in a vertical orientation where the condenser section is located at the top position. The condenser section of the PHP was thermally anchored to a cryocooler with a cooling capacity of 1 W at 4.2 K and was operated from 2.9 K to 5.1 K. A total of 9 germanium type GR-200A and one Cernox® model CX-1050 were used to measure the temperature distribution, and a pressure transducer was used to record the fluid’s pressure oscillations. Each PHP section consists of 14 turns and an adiabatic length of 300 mm. This innovative design consists of two sub-evaporator sections for each PHP, resulting in a total number of six evaporators. This configuration was chosen in order for future testing in a varied heat load arrangement. This paper presents results based on equal heat load distribution throughout the evaporator sections.
机译： 突出显示 • 三级氦气脉动热管（PHP）已成功运行。 • 填充率范围从20％到90％ • 观察到PHP的温度和压力频率为1.2 Hz。 •< / ce：label> 执行了2000多次测试。 • 在填充率为69.5％的情况下，最佳热性能为50 kW / mK。 < / ce：list-item> 摘要 k eff 大约50,000 W / mK。 PHP在冷凝器部分位于顶部位置的垂直方向上操作。 PHP的冷凝器部分热锚固在制冷量为4.2 K且制冷量为1 W的低温冷却器上，并在2.9 K至5.1 K的温度范围内运行。总共9种锗型GR-200A和1台Cernox®CX-1050型用于测量温度分布，并使用压力传感器记录流体的压力振荡。每个PHP部分由14圈组成，绝热长度为300mm。这种创新的设计包括每个PHP的两个子蒸发器部分，因此总共有六个蒸发器。选择此配置是为了将来在变化的热负荷布置中进行测试。本文介绍了基于整个蒸发器部分相等的热负荷分布的结果。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2018年第5期|1275-1286|共12页
  • 作者

    Luis Diego Fonseca; John Pfotenhauer; Franklin Miller;

  • 作者单位

    Department of Mechanical Engineering, University of Wisconsin-Madison, 1500 Engineering Drive;

    Department of Mechanical Engineering, University of Wisconsin-Madison, 1500 Engineering Drive;

    Department of Mechanical Engineering, University of Wisconsin-Madison, 1500 Engineering Drive;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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