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   CFD Modeling of TiO2 Nano-Agglomerates Hydrodynamics in a Conical Fluidized Bed Unit with Experimental Validation  
   
نویسنده Bahramian Ali Reza ,Kalbasi Mansour
منبع iranian journal of chemistry and chemical engineering - 2010 - دوره : 29 - شماره : 2 - صفحه:105 -120
چکیده    In the computational fluid dynamics (cfd) modeling of gas-solids two phase flow,the effect of boundary conditions play an important role in predicting the hydrodynamiccharacteristics of fluidized beds. in this work, the hydrodynamics of conical fluidized bed containingdried tio2 nano-agglomerates were studied both experimentally and computationally. the pressuredrop was obtained by pressure measurements and mean solid velocity in the different axial andradial positions and their experimental values were measured by a parallel 3-fiber optical probe.the eulerian-eulerian multiphase model and granular kinetic theory with using gidaspow (1994)drag function were applied in simulations. the effect of three different types of boundary conditions(bc) including no-slip/friction, free-slip/no-friction and high-slip/small-friction which weredeveloped by schaeffer (1987) and johnson and jackson (1987) were investigated. the results ofthe model were compared with the experimental data. the numerical simulation using free-slip/no-frictionbc agreed reasonably well with the experimental pressure drop measurements. the pressure dropspredicted by the simulations were in agreement with the experimental data at superficial gasvelocities higher than the minimum fluidization velocity, umf. the results for simulated mean axialsolid velocity showed that the free-slip/no-friction bc was in better agreement with the experimentaldata compared with other boundary conditions.
کلیدواژه conical fluidized bed ,Computational fluid dynamics ,Boundary condition ,Numerical simulation ,Fluidization ,Hydrodynamic parameters ,TiO2 nano-agglomerates.
آدرس amirkabir university of technology, Faculty of Chemical Engineering, ایران, amirkabir university of technology, Faculty of Chemical Engineering, ایران
پست الکترونیکی mkalbasi@aut.ac.ir
 
     
   
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