Abstract
Rotor-stator devices are known from their ability to generate very high shear stresses; due to focused delivery of energy, their energetic efficiency is regarded as high. In the present work performance of the Silverson double screen 150/250MS inline rotor-stator mixer is investigated using multiple test reactions (a simultaneous diazo coupling between 1- and 2-naphtols and diazotized sulphanilic acid), power measurements and CFD.In experiments a premixture of 1- and 2-naphtols was fed into the system through the main inlet whereas second reagent was introduced through the separate feeding tube. Experiments were carried out for the total volumetric flow rate equal to 0.1 dm3 s−1, the volume ratio of reactant solutions equal to 15, and for the rotor speed from the range between 500 and 9000 rpm.The hydrodynamics, mixing and the course of chemical reactions in the rotor-stator mixer are simulated using the standard k–ε model of Ansys Fluent and the multi-reference frame approach. The presented model is able to properly predict the power input to the rotor-stator system and details of turbulence structure, which was confirmed by comparing experimental data with model predictions for power input and product distributions.
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