Abstract
Very limited information has been reported regarding the mixing phenomena of solid particles in complex fluids. A comprehensive study was done to assess the dispersion phenomena in carboxymethyl cellulose (CMC) solution with a coaxial impeller system (a large diameter anchor stirrer and an inner axial-flow stirrer) via computational fluid dynamics modeling and tomography. The circulation patterns produced by the co-axial stirrers in dispersing the particles in the CMC solution were captured through CFD modeling. The solids loading profiles were created to analyze the axial dissemination of solids in CMC solutions utilizing the CFD and electrical resistance tomography (ERT) methodologies. The effects of some significant variables namely the CMC concentration, particle loadings, speed ratio, and central impeller type on the suspension phenomena were thoroughly analyzed. The effects of solids-wall collisions, fluid-solids collisions, and solids-solids interactions on the dispersion phenomena were examined by creating the solids circulation velocity and kinetic energy profiles.
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