Based on powder mechanics and packed-bed model,theoretical equations have been derived [4] to predict pressure drop in low-velocity slug-flow pneumatic conveying of bulk solid materials.By applying and analysing these equations,it was found that the effect of packed-bed aeration characteristics on the prediction of pressure drop can be neglected.Therefore, the pressure drop can be predicted simply after measuring some particle properties (e.g. loose-poured bulk density,wall friction angle and internal friction angle).The packed-bed aeration characteristics can be assumed arbitrarily.Comparison was made between the predicted and experimental values of pressure drop-flow and had dramatically different particle properties in terms of size,size distribution,density and shape.The agreement was very good.
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