低温工学
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
超臨界窒素中における熱輸送現象の可視化に関する研究
中納 暁洋白石 正夫染矢 聡西尾 匡弘飯田 光人村上 正秀
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2000 年 35 巻 2 号 p. 79-86

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This paper describes the results of a visualization study of the phase transition process and heat transport phenomenon in supercritical nitrogen. An experimental apparatus for the visualization study is designed to observe the heat transport phenomena. The experimental cell is a rectangular parallelepiped surrounded with two optical windows, a ceiling, two side-walls made of Bakelite and a planar heater at the bottom. Heat is applied in step functions from the planar heater. The phase transition from the vapor/liquid equilibrium state to the supercritical state is observed by the use of a shadowgraph technique. On the other hand, the heat transfer phenomenon in supercritical nitrogen is investigated using a laser holographic interferometer. The initial temperature gradient, which suppresses the generation of convection, is made in the experiment. We can successfully observe the heat transport phenomenon that the convection and piston effect carry thermal energy in supercritical nitrogen.

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