Further development of an energy-minimization multiscale modeling approach to simulating two-phase flow under turbulent conditions that considers the size distribution of mesoscale structures, i.e. bubbles and cluster...Further development of an energy-minimization multiscale modeling approach to simulating two-phase flow under turbulent conditions that considers the size distribution of mesoscale structures, i.e. bubbles and clusters, is presented. User-defined values of minimum and maximum cluster or bubble diame- ters were specified. A uniform size distribution was first considered as a test case, in which the drag force comprised contributions from each size group. The mathematical form of the objective function describing the energy for suspension and transport was not altered. The heterogeneity index of this new drag modification was then used to simulate pilot-scale circulating fluidized-bed risers involving Geldart group A particles. The results were validated against available experimental data. The model is capable of capturing both axial and radial profiles of flow-field variables.展开更多
基金The first author acknowledges the support of his colleagues, especially Dr. Muhammad Zaman. The second author acknowledges a fellowship received from the Pakistan Institute of Engineering ＆ Applied Sciences for her MS in Process Engineering. Dr. Hong acknowledges the support of the Qing Lan Project of Jiangsu Province, China financial support from the National Natural Science Foundation of China （Grant No. 21406081）+1 种基金 Natural Science Foundation of the Higher Education Institutions of Jiangsu Province, China （Grant No. 17KJA530001 ） Jiangsu Provincial Engineering Laboratory for Biomass Conversion and Process Integration （Grant No. JPELBCPI2016001 ） is also gratefully acknowledged.
文摘Further development of an energy-minimization multiscale modeling approach to simulating two-phase flow under turbulent conditions that considers the size distribution of mesoscale structures, i.e. bubbles and clusters, is presented. User-defined values of minimum and maximum cluster or bubble diame- ters were specified. A uniform size distribution was first considered as a test case, in which the drag force comprised contributions from each size group. The mathematical form of the objective function describing the energy for suspension and transport was not altered. The heterogeneity index of this new drag modification was then used to simulate pilot-scale circulating fluidized-bed risers involving Geldart group A particles. The results were validated against available experimental data. The model is capable of capturing both axial and radial profiles of flow-field variables.
