Kaichiro Mishima

TL;DR: In this paper, a flat bubble column with rectangular cross-section was measured by particle tracking velocimetry, and simultaneous measurements of void fraction by using high frame rate neutron radiography and four-sensor probe were also performed to observe the bubble-probe interaction.

TL;DR: In this article, the authors present the present status on the development of high-frame-rate neutron radiography with a steady thermal neutron beam and its application to multiphase flow research performed at the Research Reactor Institute of Kyoto University in collaboration with the Japan Atomic Energy Research Institute.

TL;DR: In this paper, a 1-dimensional drift-flux model was developed and benchmarked with existing models in the present study, which can be applied to both boiling and adiabatic air-water two-phase flows.

TL;DR: In this paper, a simulation of nitrogen gas-molten lead/bismuth two-phase flow in a rectangular pool was performed by using the neutron radiography technique, which revealed that Kataoka-Ishii's equation was suitable basically for estimation of drift velocity, namely, drag force between phases.

TL;DR: In this paper, the authors investigated the temporal and spatial resolution of the neutron radiographic technique and applied this technique to the visualization and measurement of thermal and fluid phenomena, and they determined that the temporal resolution was determined by the sensitivity and light decay time of the image detector and statistical variation of neutrons, and the resolution limits of static and dynamic imaging methods were estimated to be a few microseconds and a few hundred microseconds, respectively.