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Estimation of Residence Time Distribution in two Elements of a Ko-Kneader

Abstract An attempt has been made to estimate the resident time distribution (RTD) in the KE and EZ elements of the Buss Ko-Kneader. The effects of both rotating and reciprocating motions of the screw were taken in to account in the flow analysis as well as in a simplified mathematical model developed for the RTD estimations. The basic function employed in the present work was F(t) = ∫ f(t) dt, where f(t) dt defined as dq/q was evaluated as a function of the channel depth. Due to the periodic nature of the system averages of minimum resident time was considered as tmin in the above equation. The computation of the model was carried out to evaluated the F(t) as a function of time for both KE and EZ elements. These results demonstrate that the residence time distribution in KE element is slightly narrower than that in EZ element.