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Development of Spherical Fine Powders by High-pressure Water Atomization Using Swirl Water Jet 2
Terai Shinji,Kikukawa Masato,Inaba Tsuneta,Koyama Tadashi 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
In order to obtain spherical fine powder, we have developed a new method of high-pressure water atomization system using swirl water jet with the swirl angle . The effect of nozzle apex angle upon the morphology of atomized powders was investigated. Molten copper was atomized by this method, with rad (swirl water jet) and rad (conical water jet). It was found that the median diameter of atomized powders decreased with decreasing down to 0.35 rad in each , but under θ<0.35 rad, increased abruptly with decreasing for rad, while it was still decreased with decreasing for rad.
( Yuichiro Otera ),( Haruki Inoue ),( Takehiko Seo ),( Masato Mikami ),( Shinji Watanabe ),( Masato Tamura ) 한국액체미립화학회 2010 한국액체미립화학회 학술강연회 논문집 Vol.2010 No.-
More viscous fuels such as residual oil tend to be burned in boilers. However, the use of high viscous fuels in conventional plants will degrade combustion characteristics, such as combustion efficiency and emission characteristics, which greatly depend on the fuel spray characteristics. The present study investigated the effects of the fluid viscosity and the atomizing air flow rate on the spray characteristics of a Y-jet atomizer. The test liquid and atomizing gas were aqueous glycerol solutions and air, respectively. Spray shape was visualized at different axial positions by using short-exposure backlight method. Droplet size and velocity were measured by a Phase Doppler Particle Analyzer (PDPA).The results show that the spray shape was similar to hollow-cone regardless of viscosity and air flow rate. Spatial distribution of total droplet volume measured by PDPA per minute had the maximum value at the opposite side of test liquid supply line. The largest Sauter mean droplet diameter (SMD) existed at the side of test liquid supply line. SMD increased with the test liquid viscosity. On the other hand, as the atomizing air flow rate was increased, SMD decreased.