期刊
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
卷 257, 期 -, 页码 123-131出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2018.02.025
关键词
Particle drawdown; Stir casting; Metal matrix composites; Impeller; Particle distribution
资金
- National Research Foundation of Korea [NRF-2016R1A2B4014326]
- Fundamental Research Program of the Korea Institute of Materials Science (KIMS) [PNK5860]
- National Research Council of Science & Technology (NST), Republic of Korea [PNK5860] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
An extensive set of experiments was carried out to examine the effects of impeller types, impeller locations (submergence), solid volume fraction, and baffle configuration on the drawdown efficiency. Flow simulations in a turbulent regime were also performed to investigate the flow patterns, spatial homogeneity (using the mean age distribution), and particle drawdown mechanisms (using a particle level simulation with the discrete phase model). A combination of two casting impellers (a helical impeller near the top and a radial one near the bottom) with two half -baffles was determined to be the optimal configuration for complete drawdown with enhanced particle distribution, while avoiding air entrainment and lowering the impeller speed. Hydrodynamic mechanisms leading to superior drawdown and dispersion performance of the optimal design are discussed with the formation of free surface swirling, turbulence strength, roles of half baffles and helical/radial impellers on the flow and particle motions.
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