Optimum performance through CFD modelling of clarifier designs

The concept of computational fluid dynamics modelling is introduced and potential applications within the sugar industry are identified. The availability of the computational fluid dynamics package FIDAP has enabled an analysis of the flows occurring in a SRI clarifier to be undertaken. The results of a number of simulations indicate the predicted flows are in general agreement with those that have been observed in factory installations. A number of design aspects have been identified that could improve clarification efficiency and performance. Of the options discussed, the modification offering the greatest potential for improved clarification performance is to increase the juice flow to the inner take-off launder. The modification is easily implemented and the benefits predicted by the modelling are significant. The benefits include improved conditions for mud separation and settling, and a reduced mud loading towards the outer regions of the clarifier floor.