For the reaction , the temperature inside a plug flow reactor (PFR) and the temperature of the heat transfer fluid in an annular region around the reactor are plotted as functions of the cumulative reactor volume. The overall conversion is also plotted. The flow of the reactants and the heat transfer fluid is co-current. A cross section of the annular region is provided in each plot. The smaller green circle represents the PFR and the larger blue circle represents the annulus (radius = 2 m) where the heat transfer fluid flows co-currently to the reactants. You can vary the inlet temperature of the heat transfer fluid, the reactor diameter, and the heat of reaction. The inlet velocities of the heat transfer fluid and the reactant are fixed as the reactor radius changes. When the reactor radius increases, the inlet flow rate of reactant increases.