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首页> 外文期刊>Journal of Heat Transfer >Neutron Radiography of Condensation and Evaporation of Hydrogen in a Cryogenic Condition
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Neutron Radiography of Condensation and Evaporation of Hydrogen in a Cryogenic Condition

机译：低温条件下氢的冷凝和蒸发的中子射线照相

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摘要

The condensation and evaporation of hydrogen under cryogenic conditions is visualized by using neutron imaging at the BT-2 Beam Facility at the National Institute of Standards and Technology (NIST). The condensation and evaporation are controlled by adjusting temperature (20 K ～ 23 K) and pressure (1.3 ～ 1.95 bar absolute). The hydrogen contained in the aluminum test cell inside the cryostat has a large attenuation coefficient due to its large scattering cross section. The high sensitivity of neutron radiography to hydrogen allows the visualization of a meniscus and a contact line of evaporating hydrogenated cryogenic propellants. The graphic represents the temperature, pressure and corresponding images of liquid hydrogen in the test cell. The test cell is made of Aluminum 6061 with an inner diameter of 12 mm. The captured images are then median filtered and post-processed in order to find the volume of liquid hydrogen in the test cell as a function of time. The condensation/evaporation rates obtained from neutron imaging along with corresponding temperature and pressure are used to validate the evaporation model being developed by the authors.
机译：通过在美国国家标准技术研究院（NIST）的BT-2射束设施中使用中子成像技术，可以观察到低温条件下氢的冷凝和蒸发。冷凝和蒸发可通过调节温度（20 K〜23 K）和压力（绝对压力1.3〜1.95 bar）来控制。低温恒温器内部的铝测试槽中包含的氢由于其大的散射截面而具有较大的衰减系数。中子射线照相对氢的高敏感性使得可以看到弯月面和蒸发的氢化低温推进剂的接触线。该图形表示测试单元中液态氢的温度，压力和相应的图像。测试电池由内径为12 mm的铝6061制成。然后对捕获的图像进行中值滤波并进行后处理，以便找到测试池中液态氢的体积与时间的关系。从中子成像获得的凝结/蒸发速率以及相应的温度和压力被用于验证作者正在开发的蒸发模型。

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  • 来源
    《Journal of Heat Transfer》 |2015年第8期|080901.1-080901.1|共1页
  • 作者

    Kishan Bellur; Ezequiel Medici; Jeffrey Allen; Chang Kyoung Choi; Jimes Hermanson; Arun Tamilarasan; Daniel Hussey; David Jacobson; Juscelino B. Leao; John McQuillen;

  • 作者单位

    Michigan Technological University, Houghton, MI 49931;

    Michigan Technological University, Houghton, MI 49931;

    Michigan Technological University, Houghton, MI 49931;

    Michigan Technological University, Houghton, MI 49931;

    University of Washington, Seattle, WA 98195;

    University of Washington, Seattle, WA 98195;

    National Institute of Standards and Technology, Gaithersburg, MD 20899;

    National Institute of Standards and Technology, Gaithersburg, MD 20899;

    National Institute of Standards and Technology, Gaithersburg, MD 20899;

    NASA Glenn Research Center at Lewis Field, Cleveland, OH 44135;

  • 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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