Abstract Liquid droplet impingement (LDI) erosion can never be caused when there is not any liquid droplet in a piping system. In this study, the liquid droplet generation from l iquid film formed downstream an orifice in a pipe was studied experimentally and visualized by using a high-speed camera. Water-air two-phase flow was supplied to the orifice and liquid film was formed in the recirculation region downstream the orifice. It was found from the experiment that the liquid film was entrained by the fas...
英字タイトル:
Visualization Experiment of High-speed Gas-liquid Two-phase Flow and Liquid Droplet Generation from Liquid Film downstream of an Orifice

A scientifically correct understanding of the nature of ionizing radiation and its impact on the health has become more and more important after the accident at the Fukushima nuclear power plant due to the Great East Japan Earthquake that occurred on March 11, 2011. We studied fabrication and effective usage of diffusion cloud chamber for general public. It was found that especially the shielding effect for various radiations shown by our cloud chamber is very effective for comprehensive understanding ...
英字タイトル:
The Study of a Usage of Diffusion Cloud Chamber for Understanding of Ionizing Radiation

Pipe wall thinning is one of the most important technical problems in nuclear power plants. For example, the wall thinning occurs by two-phase flow at both the orifice downstream and the first elbow located downstream after the orifice. In this study, a visualization experiment was conducted in order to clarify the detailed mechanism of the wall thinning by erosion (LDI is expected) in the piping system consisting of an orifice, a straight pipe and an elbow.In the experiment a strong pressure at the down ...
英字タイトル:
Analysis (2) of Liquid Droplets Impact Erosion at the orifice downstream area caused by supersonictwo-phase flow