This work proposes the use of global quantitative dispersive and distributive mixingindices to characterize the performance of a given screw. Calculation of these quantities uses amodel of morphology evolution as a function of material and flow characteristics, which wascoupled to a description of the flow developing along the screw from hopper to die. Scale-up onthe basis of these indices is briefly discussed. Some results are presented in order to illustrate theusefulness of the methodology.
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