supported by the National Natural Science Foundation of China (NSFC) under Grant Nos. 20306012 and 20806045;the National Foundation of PR China for Authors of Excellent Doctoral Dissertations (No. 200245);Specialized Research Fund for Doctoral Program of Higher Education (No.20050003028)
Numerical simulation of fully developed hydrodynamics of a riser and a downer was carried out using an Eulerian-Lagrangian model, where the particles are modeled by the discrete element method (DEM) and the gas by t...