Journal Of Applied and Computational Sciences in Mechanics

Journal Of Applied and Computational Sciences in Mechanics

Numerical Analysis of the Hydrodynamic Behavior of Three-Phase Mixing of Rice Husk, Sand and Air in a Bubbling Fluidized Bed with Particle Granular Behavior

Document Type : Original Article

Authors
Reza Karimi Ahmadi
HamidReza Nazif
Mechanical Engineering, Faculty of Technical & Engineering, Imam Khomeini International University, Qazvin, Iran.
10.22067/jacsm.2022.71387.1041
Abstract
Biomass is important as a renewable source of energy worldwide. The role of mixing and segregation of particles in the process of gasification of the fluidized bed is important. better mixing of these particles the better the quality of synthesized gases emitted from biomass gasification process. This study investigates the three-phase mixing process of rice husk (biomass), sand (bed material) and air in a bubbling fluidized bed using the finite volume and computational fluid dynamics tool with Eulerian multiphase flow approach. effect of the restitution coefficient between the particles and the wall boundary conditions for the solid phase in the process of mixing biomass and bed material has been studied. In this study, the effect of free slip, partial slip and no-slip for particles in contact with the wall has been investigated. In the case of partial slip the velocity of rice husk and sand higher than other two cases. Therefore, as the velocity of particles in the bed increases, the uniform mixing and distribution of particles in the bed increases and segregation of particles decreases. study of pressure drop in the fluidized bed shows that in free slip conditions, the pressure drop is 8.09% and 14.2% less than partial slip and no-slip, respectively. Also, three types of rice husks with different restitution coefficients have been studied. As a result of this study, with decreasing the restitution coefficient between particles, the velocity of rice husk and sand particles increases by about 9% and the pressure drop decreases by about 22%.
Keywords
Bubbling Fluidized Bed
the Eulerian Approach
Hydrodynamic
Biomass
Mixing Bed Material and Biomass
Restitution Coefficient
Specularity Coefficient
Wall Boundary Condition for solid Phase
Subjects
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