To study the hydrodynamic characteristics of gas-solid-phase flow in a pulse riser,a dense discrete particle model considering particle collisions and solid volume fraction is used.The core-annular flow in the enlarge...To study the hydrodynamic characteristics of gas-solid-phase flow in a pulse riser,a dense discrete particle model considering particle collisions and solid volume fraction is used.The core-annular flow in the enlarged-diameter section of the pulse riser is described,which can be destroyed with a high superficial gas velocity.The particle trajectory crossing effect and particle-particle and particle-wall collisions in the reduced-diameter section of the pulse riser can also destroy the core-annular flow and enhance the gas-solid interaction.The solid volume fraction exhibits an S-type distribution at different solid mass rates.The distribution of axial velocity,radial velocity,and relative slip velocity is investigated by analyzing the simulated results at different pulse riser diameter ratios.A suitable pulse riser diameter ratio can improve the performance of the pulse riser.展开更多
基金This study was supported by the National Natural Science Foundation of China(No.21878335,21576293,and 21576294)the Major Scientific and Technological Innovation Projects in Shandong Province of China(No.2018CXGC0301)+1 种基金the Fundamental Research Funds for the Central Universities(18CX02121A)The authors gratefully acknowledge the financial support from the State Key Laboratory of Heavy Oil Processing and the Shandong Natural Science Foundation(ZR2017QEE006).
文摘To study the hydrodynamic characteristics of gas-solid-phase flow in a pulse riser,a dense discrete particle model considering particle collisions and solid volume fraction is used.The core-annular flow in the enlarged-diameter section of the pulse riser is described,which can be destroyed with a high superficial gas velocity.The particle trajectory crossing effect and particle-particle and particle-wall collisions in the reduced-diameter section of the pulse riser can also destroy the core-annular flow and enhance the gas-solid interaction.The solid volume fraction exhibits an S-type distribution at different solid mass rates.The distribution of axial velocity,radial velocity,and relative slip velocity is investigated by analyzing the simulated results at different pulse riser diameter ratios.A suitable pulse riser diameter ratio can improve the performance of the pulse riser.
