| Liquid-solid spouted bed has advantages of good mass transfer and heat transfer,excellent mixture, simple structure and so on. It is widely used in the field of oil wastewater and industrial sewage treatment. With the advance of science and technology, fluidization technology is more and more advanced. For the particle density is less than the liquid density,this paper presents a new inverse liquid-solid spouted bed. By studying this kind of antifluidization system, providing theoretical basis for the application of inverse spouted bed in the field of wastewater treatment.Flow behavior of solid liquid phase was simulated in a 3d inverse spouted bed based on the Euler-Euler two-fluid flow model. The k-epsilon turbulence model is used to solve liquid flow, and the Gidaspow drag force model is also used to simulate the interphase forces.Observing changes of two phase flow behavior at different inlet superficial liquid velocity,0.35m/s, 0.18m/s, 0.09m/s; different liquid viscosity, 0.001 Pa·s, 0.00432 Pa·s, 0.00786 Pa·s;and different particle diameter, 1.41 mm, 2mm. The spouted bed’s liquid-solid flow behavior of inlet cone angles with 90 degree and 60 degree is also compared and analyzed.The results show that, under the impact of inlet liquid, the particles move down near the center of the spouted bed, and move to two side walls after arrived bed, then move upward.The smaller the inlet cone angle of spouted bed is, the bigger the migration velocity of particles is, and the thicker the bed is. The higher the liquid viscosity is, the thicker the bed is,and the smaller the particles velocity is. With the increase of inlet superficial liquid velocity,the solid phase and liquid phase axial velocity will also increase. With the increase of particle volume fraction, the granular temperature of particles first increased and then decreased. The higher the inlet liquid velocity or the lower the viscosity of liquid is, the higher the granular temperature of particles is. |
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