Paper 1: A hydrodynamic mixing (HDM) model, used to calculate the steady-state spatial distribution of conversion for a second-order reaction in a continuous stirred-tank reactor (CSTR) for non-premixed reactants was developed and contrasted with other methods. The HDM model is based on a segmental description of the reactor and includes turbulent mixing effects in each segment. As a test of the model, the experimental results obtained from a tubular reactor were found to be very well represented for a range of reactant ratios. Spatial distributions of concentration and segregation intensity (degree of mixing) within the CSTR were determined for a variety of reactor operating conditions for an isothermal reactor and, in addition, the spatial distribution of temperature was calculated for a non-isothermal reactor. That extension of the model was simple and straight-forward, since distributions of conversion were already available from the main model --Abstract, page 2.
Paper 2: The time-varying response of an incompletely mixed continuous stirred-tank reactor (CSTR) with second-order reaction is described by an extension of the hydrodynamic mixing (HDM) model. It generates the spatial time responses of concentration and segregation intensity which result from variations in impeller speed or reactant feed rates of non-premixed feeds. These responses were determined at various levels of feed rate, reaction rate constant, and impeller speed.
The validity of the HDM model for mixing alone was established by comparison with experimental data. The time-varying HDM model is based on a segmented description of the mixer-reactor and includes turbulent mixing effects within each segment. The advantages over simplified models are demonstrated by comparison of HDM model responses with responses obtained from a segmented model with segregation effects suppressed and from models based on perfect back-mixing --Abstract, page 69
