TY - JOUR ID - 5583 TI - A Numerical Study on Agglomeration in High Temperature Fluidized beds JO - Journal of Chemical and Petroleum Engineering JA - JCHPE LA - en SN - 2423-673X AU - Mansourpour, Zahra AU - Mostoufi, Navid AU - Sotudeh-Gharebagh, Rahmat AD - School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran AD - University of Tehran Y1 - 2014 PY - 2014 VL - 48 IS - 1 SP - 15 EP - 25 KW - Agglomeration KW - Discrete element method KW - Fluidized bed KW - High temperature solid bridge DO - 10.22059/jchpe.2014.5583 N2 - Soft-sphere discrete element method (DEM) and Navier-Stokes equations were coupled with equations of energy for gas and solids to investigate the process of agglomeration in fluidized bed of polyethylene particles at high temperature. The Newton’s second law of motion was adapted for translational and rotational motion of particles and agglomerates. The cohesive force for polyethylene particles was calculated based on a time dependent model for solid bridging by the viscous flow mechanism. The motion of agglomerates was described by means of the multi-sphere method. By taking into account the cohesiveness of particles at high temperatures and considering real dynamic agglomerates, the fluidization behavior of a bed of polyethylene particles was successfully simulated in terms of increasing the size of agglomerates. Effect of the inlet gas temperature on mass and size of agglomerates was investigated. A mechanistic study in terms of contact time, cohesive force and repulsive force, which are the key parameters in the formation of agglomerates, were also carried out. UR - https://jchpe.ut.ac.ir/article_5583.html L1 - https://jchpe.ut.ac.ir/article_5583_0d09160cc1aaf367c68b38a84d406553.pdf ER -