Abstract
An experimental study was conducted to determine the role of fluid flow on dispersion of SiC particles in molten aluminum. In this work, slurries containing up to 18 vol.% SiC were dispersed in rotational Couette flow at high shear rates ranging from 50 to 500 s −1. The relative viscosity of SiCAl metal matrix composite slurries was also measured. It was found that the particles were uniformly dispersed in the radial direction. No particle agglomeration was observed. Axial dispersion was found to occur under certain stirring conditions. A particulate dispersion number PD based on stirring parameters and particle-settling velocity was developed to describe the dispersion behavior of particles in rotating fluids. The measured viscosities of the SICAl slurries investigatedwere found to be in good agreement with Einstein's equation.
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