Abstract
A one-dimensional hydrodynamic model for the sedimentation of multisized particles was developed. The basic model was solved by the ICE numerical method, using a modified K-FIX computer code. The predicted settling rates agree with Selim's et al. settling data of two heavy species and Fessas and Weiland's experiments of heavy, buoyant two-species settling. The model also computes reasonable concentration profiles in the settler. To effectively simulate the sedimentation of multisized fine colloidal particles in non-aqueous media, the model was modified to be a diffusion-type matrix equation and solved by the method of characteristics. Surface charge effect of colloidal particles was included in the model The predicted concentration profiles for the settling of fine illite particles in toluene with asphaltene agree well with the recent experimental data reported by Shih et al.
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