In the steam piping system containing liquid droplets, the pipe wall is damaged by droplet impingement. One of the most important parameter affecting erosion is droplet diameter. It was reported the volume loss per droplet increases with 3.67th power of droplet diameter. But, conventional research, intended droplet diameter or nozzle diameter is 0.81~5.0mm. In this study, rotating disk method and high pressure impingement test method with fan-shape spray nozzle were used to carry out the experiments with small droplets on pure aluminum and low carbon steel S15C specimens. The effect of diameter was expressed as a parameter of volume loss per droplet. The volume loss per droplet increases with 4.67th power of droplet diameter.
Synopsis:It is known that cracks are formed when bulk superconductors are subjected to the oxygen annealing process, and that cracking is easier in larger bulk materials. Commercial bulk superconductors are subjected to oxygen annealing in a large block state, while the mechanical properties of the superconductors are often evaluated using specimens that are cut from a large pellet and then subjected to the oxygen annealing process. Therefore, it is suspected that there may be some discrepancies in the mechanical properties of these superconducting materials. We conducted bending and tensile tests on various specimen sizes after oxygen annealing. Observations of cracks formed during the oxygen annealing process were made. The cracking behavior was analyzed using a fracture toughness test.
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