Application of Neutron Radiography to Visualization and Void Fraction Measurement of Air-Water Two-Phase Flow in a Small Diameter Tube.

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概要

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• The purpose of this study is to investigate the feasibility of visualization and void fraction measurement of air-water two-phase flow in a small diameter tube (I. D.: 4.08 mm) by using the real-time neutron radiography and image processing techniques. Video images of two-phase flow were taken by using the real-time neutron radiography system (thermal neutron radiography facility No. 2) installed at the Japan Research Reactor 3 M of the Japan Atomic Energy Research Institute. The shape of bubbles and its moving behavior were clearly observed from the video images. The image corrections for dark current, shading, field intensity fluctuation and electrical system drift were examined in order to measure the void fraction from the video images. Though, generally speaking, the effect of the scattered neutron could not be ignored for quantification of the images taken by the neutron radiography, the scattered neutron could not affect the final results of void fraction in the case of a small diameter tube. The void fraction calculated from the corrected images was correlated well with the drift flux equation, indicating that the existing drift flux equation could be applied to predict the void fraction of two-phase flow in a small diameter tube. It was demonstrated that the real-time neutron radiography technique could be useful for measuring the void fraction of two-phase flow in a small diameter tube.

• 一般社団法人 日本原子力学会の論文

著者

• MATSUBAYASHI Masahito

  Tokai Research Establishment Japan Atomic Energy Research Institute

• Hibiki Takashi

  Research Reactor Institute Kyoto University

• NISHIHARA Hideaki

  Research Reactor Institute, Kyoto University

• FUJINE Shigenori

  Research Reactor Institute, Kyoto University

• YONEDA Kenji

  Research Reactor Institute, Kyoto University

• Mishima Kaichiro

  Research Reactor Institute Kyoto University

• KANDA Keiji

  Research Laboratory of Nuclear Reactor, Tokyo Institute of Technology

• TSURUNO Akira

  Tokai Research Establishment, Japan Atomic Energy Research Institute

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