Abstract
The hydrodynamics and mixing properties were studied with three phases (gas, liquid, and solid) flowing cocurrently upward in a column. The effects of gas and slurry velocities, solid physical properties, particle size, solids concentration, interfacial tension, and slurry viscosity on phase holdups and axial dispersion coefficients were examined. The phase holdups as well as axial dispersion coefficients were not significantly affected by particle size, solids concentration, and slurry velocities. However, solids wettability was found to enhance the coalescence tendencies in the liquid phase, and hence it decreased the axial dispersion coefficient compared to the ones for water. Addition of surfactants increased the gas holdup and slightly decreased the axial dispersion coefficient. However, an increase in the liquid viscosity reduced both the gas holdup and dispersion coefficients. The results are compared with those reported in the literature and are explained by the drift flux approach and Zuber-Findley theory.
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