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CFD simulation of solid concentration distribution in a flat bottom agitated vessel using rushton turbine
Published in Sphinx Knowledge House
Volume: 5
Issue: 5
Pages: 2252 - 2266
Computational Fluid Dynamics (CFD) studies in a baffled stirred tank agitated by six bladed turbine rotating at 300 rpm is reported in this paper. This work is concerned with the effect of small range of particle size and particle density on solid concentration distribution in a baffled tank agitated vessel stirred with Rushton turbine. The system studied consisted of a cylindrical flat bottom tank, 294 mm in diameter, with six blades Rushton turbine, 98 mm in diameter, filled with water. Baffle width is 0.1 tank diameter and the impeller clearance is 0.3 tank diameter from the tank bottom. The height of liquid level in the tank is equal to tank diameter. The solid concentration was analyzed for different suspensions sand, granite, silica and quartz of different diameters 500 μm, 650 μm, 920 μm and 1100 μm using CFD tool CFX 12.0. A classical Eulerian- Eulerian two fluids model and the standard k- ε turbulence model were used to simulate the suspension behavior. In this work, the solid concentration distribution was predicted using frozen rotor steady state approach. It was observed that the solid concentration in the radial direction is similar for different particle sizes except near the wall and it was same for different density particles which is considered in this paper. Also the solid concentration in the axial direction had similar pattern for different density particles and different sizes. It is found that the solid volume fraction is decreases with increase in particle size and density at all heights in radial direction and it is more significant at higher suspension levels. The study revealed that non uniformity in solid concentration is viewed both in radial and axial direction at this speed for this close range of particle sizes and densities.
About the journal
JournalInternational Journal of ChemTech Research
PublisherSphinx Knowledge House
Open AccessNo