Abstract
In this work, the effect of the vessel bottom roughness on the suspension of solid particles in stirred tank reactors is investigated. The experiments were performed in a baffled vessel, which was mechanically stirred with a 45° pitched blade turbine. In order to evaluate the influence of the bottom roughness on particle suspension, four bottoms of different roughness and 8 different sets of spherical particles were used. The density of the solid particles, ρ s, ranged from 2500 kg m −3 to 8743 kg m −3 and they were characterized by narrow size distributions with a mean diameter, d p, from 128 μm up to 1850 μm. Measurement of the minimum impeller speed for ‘just complete suspension’, N js, showed that the roughness of the bottom had a significant influence. The precise effect depends on the particle size compared to the size of the roughness elements and to the Kolmogoroff microscale, λ K.
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