Fluidized bed spray granulation is used to produce spherical granules from suspensions, solutions and melts. Experimental investigations revealed that fluid dynamics in the granulator plays a crucial role, in particular in the jet. The jet causes the particle movement as well as drop propagation and deposition on the particles. In this work the “Two Fluid Model” (TFM) is used to simulate the multiphase fluid dynamics in the fluidized bed. The results of simulations were validated by measuring the particle velocity using Laser Doppler Velocimetry (LDV). From the TFM-simulations with implemented growth mechanisms the growth kinetics is obtained and is used to describe the transient states of various granulation processes by solving the appropriate population balances.
BenyahiaS.SyamlalM. and O'BrienT.J. (2006) “Extension of Hill–Koch–Ladd drag correlation over all ranges of Reynolds number and solids volume fraction”, Powder Technology, 162, 166–174
2.
BeetstraR.Van Der HoefM.A. and KuipersJ.A.M. (2007) “Drag Force of Intermediate Reynolds Number Flow Past Mono- and Bidisperse Arrays of Spheres”, AIChE Journal, 53, 489–501
3.
ChapmanS. and CowlingT.G. (1970), “The mathematical Theory of Non-Uniform Gases”, Academic Press, New York
4.
DuWBaoX.J. (2006), “Computational Fluid Dynamics (CFD) modeling of spouted bed: Assessment of drag coefficient correlations”, Chemical Engineering Sci., 61, 1401–1420.
5.
FanRMarchisioD.L. and FoxR.O. (2004), “Application of the Direct Quadrature Method of Moments to polydisperse gas–solid fluidized beds”, Elsevier Sci.
6.
FanRFoxR.O. (2007), “Segregation in polydisperse fluidized beds: Validation of a multi-fluid model”, Chemical Engineering Sci., 63, 272–285.
7.
GeraDSyamlalM. and O'BrienT.G. (2004), “Hydrodynamics of particle segregation in fluidized beds”, International Journal of Multiphase Flow, 30, 419–428.
8.
GidaspowD. (1994), “Multiphase Flow and Fluidization, Continuum and Kinetic Theory Descriptions”, Academic Press, New York
9.
GunawanR.FusmanI., and BraatzR. D. (2004), “High Resolution Algorithms for Multidimensional Population-Balance Equations”, AIChE Journal, 50, No.11.
10.
HillR.J.KochD.L. and LaddJ.C. (2001), “The first effects of fluid inertia on flows in ordered and random arrays of spheres”, J. Fluid Mech., 448, 213–441
11.
KumarJ.PeglowJ.WarneckeG.HeinrichS. and MoerlL. (2006), “Improved accuracy and convergence of discretized population balance for aggregation: The cell average technique”, Chemical Engineering Sci., 61, 3327–3342
12.
LauderB.E. and ReeceG.J., (1974), “Progress in the development of a Reynolds-stress turbulence closure”, J. Fluid Mech., 68, 573–566.
13.
LoefflerF (1988), “Staubabscheiden”, Thieme Verlag, Stuttgart and New York
14.
MarchisioD.L.FoxR.O.VigilR.D., and BarresiA.A. (2003), “Quadrature Method of Moments for Population-Balance Equations”, AIChE Journal, 49, No.5.
15.
MarchisioD.L. and FoxR.O. (2005), “Solution of population balance equation using the direct quadrature method of moments”, Aerosol Sci., 36, 43–47
16.
McGrawR, (1997), “Properties and evolution of aerosols with size distributions having identical moments”, J. Aerosol Sci., 29, 761–772.
17.
MundoCSommerfeldM. and TropeaC. (1995), “Droplet-Wall Collisions: Experiments studies of the deformation and breakup process”, International Journal of Multiphase Flow, 21, 151–173.
18.
PopeS.B., (1979), “Probablity Distributions of Scalars in Turbulent Shear Flow”, Turbulent Shear Flows, 2, 7–16.
19.
RandolphA.D. and LarsonM.A. (1971), “Theory of particulate Processes”, Academic Press, New York and London
20.
SyamlalM.RogersW. and O'BrienT.J. (2005), “MFIX Documentation Numerical Technique”, Department of Energy, Morgantown, WV, USA
21.
ZankJ.KindM., and SchluenderE. U., (2001) “Particle Growth and droplet deposition in fluidised bed granulation”, Powder Technology, 120, 76–81.
