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http://dx.doi.org/10.15435/JILASSKR.2013.18.1.009

A Study for the Effect of Liquid Droplet Impingement Erosion on the Loss of Pipe Flow Materials  

Kim, Kyung Hoon (경희대학교 공과대학 기계공학과)
Cho, Yun Su (경희대학교 공과대학 기계공학과)
Kim, Hyung Joon (서울대학교 기계항공공학부)
Publication Information
Journal of ILASS-Korea / v.18, no.1, 2013 , pp. 9-15 More about this Journal
Abstract
Wall thinning of pipeline in power plants occurs mainly by flow acceleration corrosion (FAC), cavitation erosion (C/E), liquid droplet impingement erosion (LDIE). Wall thinning by FAC and C/E has been well investigated; however, LDIE in plant industries has rarely been studied due to the experimental difficulty of setting up a long injection of highly-pressurized air. In this study, we designed a long-term experimental system for LDIE and investigate the behavior of LDIE for three kinds of materials (A106B, SS400, A6061). The main control parameter was the air-water ratio (${\alpha}$), which was defined as the volumetric ratio of water to air (0.79, 1.00, 1.72). In order to clearly understand LDIE, the spraying velocity (${\nu}$) of liquid droplets was controled larger then 160 m/s and the experiments were performed for 15 days. Therefore, this research focuses relation between erosion rate and air-water ratio on the various pipe-flow materials. NPP(nuclear power plant)'s LDIE prediction theory and management technique were drawn from the obtained data.
Keywords
LDIE(Liquid Droplet Impingement Erosion); Liquid atomizing nozzle; Two phase nozzle; air-water ratio; Erosion rate;
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