Mathematical modelling of plug-flow spray dryer

The present work has focused on mathematical modelling for spray drying operation using plugflow conditions in order to compare two modelling approaches: Characteristic Drying Rate Curve (CDRC) model and Reaction Engineering Approach (REA) model. The models were solved using a numerical method for the case of drying of a 'mono-disperse' stream of identical droplets. The predictions by the CDRC and REA models were compared using the Excel programmes, which were used as process calculation tools. Furthermore, the biological quality has been predicted using a novel approach that represents the unsteady-state behaviour of the drying process and also compared using two drying kinetics models. The REA model was found to be more realistic and better overall.