End effects in flow-analysis and process systems

Abstract

The "end effects" in flow-analysis and process systems are investigated theoretically on the basis of the axially-dispersed plug-flow model. Three-section systems consisting of reactor, fore- or after-section and additional section are used. In the additional section back-mix flow is assumed to exist. The corresponding Peclet number has been found to be 0.01. The difference between the system responses to a delta-function input signal for finite and infinite length of the fore- or after-section is studied. Both the statistical moments of the system responses and the actual response curves are used for that purpose. The results can be used to evaluate the length of the fore- and after-section..