Fluidization Behavior of Elongated Particles - CFD-DEM Simulations and X-Ray Tomography Experiments
In this work, we investigate bubble dynamics in 3D fluidized beds with Geldart D spherocylindrical particles using both experimental and numerical approach. For numerical simulations, we use an open source CFDEM code which uses coupled OpenFOAM computational fluid dynamics (CFD) solver to describe the fluid phase and LIGGGHTS, the discrete element method (DEM) to account for particle-particle interactions. This CFD-DEM code was adapted to take in to account spherocylindrical particles [1, 2]. Hydrodynamic interactions between fluid and spherocylindrical particles are modeled using correlations developed by Sanjeevi et al. . Results from the CFD-DEM simulations are compared with experimental results obtained with X-ray tomography. This non-invasive experimental method gives us insight into properties of bubble formation in a 3D fluidized bed [4-5]. Comparison is made on the basis of bubble size and shape, bubble rise velocity, and bubbles and void fraction distributions.
 V. V. Mahajan, T. M. J. Nijssen, J. A. M. Kuipers, J. T. Padding, (2018), âNon-spherical particles in a pseudo-2D fluidised bed: Modelling studyâ, Chem. Eng. Science, 192, 1105-1123
 I. Mema, V. V. Mahajan, B. W. Fitzgerald, J. T. Padding, (2018), âEffect of lift force and hydrodynamic torque on fluidization of non-spherical particlesâ, Chem. Eng. Science, In Press, doi: 10.1016/j.ces.2018.10.009
 S. K. P. Sanjeevi, J. A. M. Kuipers, J. T. Padding, (2018), âDrag, lift and torque correlations for non-spherical particles from Stokes limit to high Reynolds numbersâ, Int. J. Multiphase Flow, 106, 325-337
 F. Schillinger, T.J. Schildhauer, S. Maurer, E. Wagner, R.F. Mudde, J.R. van Ommen, (2018), âGeneration and evaluation of an artificial optical signal based on X-ray measurements for bubble characterization in fluidized beds with vertical internalsâ. Int. J. Multiphase Flow, 107, 16-32
 S. Maurer, D. Gschwend, E. C. Wagner, T. J. Schildhauer, J. R. Van Ommen, S. M. A. Biollaz, R. F. Mudde, (2016), âCorrelating bubble size and velocity distribution in bubbling fluidized bed based on X-ray tomographyâ, Chem. Eng. J., 298, 17-25