278206 Simulation of Flow Behavior of Particles in a Magnetic Liquid-Solid Fluidized Bed

Tuesday, October 30, 2012
Hall B (Convention Center )
Shuyan Wang1, Lixin Wei2, Jinsen Gao3 and Xingying Lan3, (1)Chemical & Biological Engineering, Princeton University, Princeton, NJ, (2)School of Petroleum Engineering, Northeast Petroleum University, Daqing City , China, (3)State Key Laboratory of Heavy Oil Processing,China University of Petroleum, Beijing, China

Simulation of Flow Behavior of Particles in a Magnetic Liquid-Solid Fluidized Bed

with Uniform Magnetic Field

Shuyan Wang 1, 2, Lixin Wei 2, Jinsen Gao 3,Xingying Lan3

1 Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ, United States

2 School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China

3 State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, 102249, China

ABSTRACT

Magnetic fluidized beds (MFB) of magnetically susceptible particles are considered as one of the technologies developed to eliminate the drawbacks of fluidized beds. The MFB results in an improved fluid-solid contactor that combines the most desirable characteristics of both fluidized and packed beds. The MFB deals with two basic magnetization modes: Magnetization FIRST (preliminary magnetization of fixed bed and consequent fluidization) and Magnetization LAST (magnetization of preliminarily fluidized beds). In present study, the flow behavior of solid phases is simulated by means of DEM-CFD in a liquid-solid fluidized bed with LAST mode along an axial uniform magnetic field. The magnetic force on the particle due to the nonuniform magnetic field resulting from the interaction of the external uniform field and nonuniform fields of the magnetized particles is predicted. By changing the magnetic field strength, the distribution of particles is studied within the bed. The distributions of velocity and concentration of ferromagnetic particles are analyzed at the different magnetic field intensities. The simulations show a significant effect on the motion of particles with axial magnetic fields applied. When the magnetic field strength is increased to a value at which the fluidization of strings starts, the particles are found to form straight-chain aggregates in the direction of the magnetic field. At very high magnetic field strengths, the defluidization is observed at which particles are fixed in the bed. Simulations indicate the granular temperature of particles increases, reaches a maximum, and then decreases with the increase of magnetic-flux density. Through the analysis of the motion of particles, it is concluded that the moderate strength magnetic field gives a high fluctuation of particles.


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