The analysis of the influence of the normal restitution coefficient model on calculated particles velocities by means of Eulerian-Lagrangian approach.

Abstract The main aim of the research presented in the paper was to determine the sensitivity of the model describing the flow of the dispersed phase in the spout-fluid bed apparatus operating in a fast circulating dilute spout-fluid bed regime to the way of calculating the normal restitution coefficient during collisions of particles with the wall. On the basis of relevant literature, four models were selected that could be applied to microcrystalline cellulose particles used in the described device: Thornton's, two variants of Jackson-Green, and LWT (Li-Wu-Thornton). The results of the dispersed phase velocity in the draft tube and annular zone of the device obtained from the computer simulations were compared with the experimental data. The LWT model, which accurately reproduces the particle velocity in the draft tube zone, provided the best match with the measured data. Graphical abstract Unlabelled Image Highlights • Discrete phase model with particle-wall interaction is introduced. • The influence of normal restitution model on the flow of particles is analyzed. • Results of Li-Wu-Thornton model are found in best agreement with experimental data. [ABSTRACT FROM AUTHOR]