Abstract
This paper presents results of an ongoing investigation into the modelling of pressure drop in bends due to the pneumatic conveying of fine powders. Two grades of cements and fly ash have been pneumatically conveyed from fluidized dense- to dilute-phase through three different radius of curvature (1000, 800, 600 mm), two different bend diameters (53 and 42 mm) and two different locations of test bend in the pipe loop. Six existing bend pressure drop models have been investigated for their prediction accuracy by comparing the predicted versus experimental bend pressure drop values. A theoretical framework for flow through the bends has been provided. Based on the conveying data of different products, bend diameters, radius of curvature of bends, a new model for bend loss has been developed which included physical properties of particles, parameters of gas flow and ratio of radius of curvature of bends to pipe diameter and bend diameter. The new model has been evaluated by using it to predict for bend loss for another grade of fly ash conveyed through four different radius of curvature of bends. The results of evaluation have shown promising outcome.
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