Abstract
The aim of this research was to investigate the effect of equipment design on suspending solid particles in stirred vessels. We investigated and evaluated several improvements to the Grenville-Mak-Brown correlation for the just-suspended impeller speed with the goal of generalizing it. We present two new geometry-specific as well as generalized suspension correlations based on experiments made with 225 µm sand in water in four vessel geometries: cylindrical flat-based, cylindrical torispherical dish-based, square flat-based, and horizontally oriented cylindrical vessels. We also present novel experimental data for both a wide blade hydrofoil and a pitched blade turbine. We define a vessel sphericity parameter to generalize the various tanks into a single correlation permitting interpolation to other vessel types and sizes not tested. We further show how controlled particle settling can be used to transform a flat-based stirred vessel into an equivalent torispherical dish-based vessel to save energy.
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