International Scientific Journal


In Laboratory for Thermal Engineering and Energy of Institute Vinča, University of Belgrade, a two-dimensional CFD modeling procedure of numerical simulation of unconventional liquid fuel combustion in bubbling fluidized bed (BFB) has been developed. This procedure is based on a two-fluid Euler-Euler approach modeling a fluidized bed (FB) with the determination of the velocities field of gas and particulates in two-phase, granular flows, analog to the kinetic theory of gases (KTGF). This model describes in detail the unsteady motion of gas and solid phases, the formation and movement of bubbles with the combustion process in the FB, but temperature profiles calculated by the bed height differ to some extent from the experimentally obtained profiles. This discrepancy is probably due to the inability of a two-fluid CFD model to give a realistic simulation of the liquid fuel mixing in a fluidized bed. Therefore, an analytical model has been developed, where one of the basic assumptions is that the particles are mixed in the vertical direction of fluidized bed mainly by the bubble wakes. The proposed zonal type of calculating procedure is based on Davidson and Harrison two-phase model of the bubbling FB, where FB is divided into zones within which material and energy balances are set.
PAPER REVISED: 2019-06-07
PAPER ACCEPTED: 2019-07-03
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE Supplement 5, PAGES [S1627 - S1636]
  1. European Commission, Reference Document on the Best Available Techniques for Waste Incineration, Bruxelles, EU, 2006,
  2. Gera, D., Computer simulation of bubbles in large-particle fluidized beds, Powder Technol, 98, 1998, 1, pp. 38-47,
  3. Ibsen, C. Comparison of multifluid and discrete particle modeling in numerical predictions of gas-particle flow in circulating fluidized beds, Powder Technol. 147, 2004, 1, pp. 29-41,
  4. Bokkers GA Mixing and segregation in a disperse gas-solid fluidized bed: a numerical and experimental study, Powder Technol. 140, 2004; 3, pp. 176-86,
  5. Di Renzo, A., Di Maio, F.P, Homogeneous and bubbling fluidization regimes in DEM-CFD simulations: hydrodynamic stability of gas and liquid fluidized beds, Chem. Eng. Sci. 62, 2007, 1-2, pp.116-130,
  6. Enwald, H. Simulation of the fluid dynamics of a bubbling fluidized bed. Experimental validation of the two-fluid model and evaluation of a parallel multiblock solver, Chem. Eng. Sci. 54, 1999, 3, pp.311-328,
  7. Cammarata L 2D and 3D CFD simulations of bubbling fluidized beds using Eulerian-Eulerian models, Int J Chem Reactor Eng, 1, 2003; 1, pp.1542-6580,
  8. Behjat Y, CFD modeling of hydrodynamic and heat transfer in fluidized bed reactors, Int Commun Heat Mass Transfer, 35, 2008, 3, pp.357-368,
  9. Gidaspow, D., Multiphase Flow and Fluidization: Continuum and Kinetic Theory Descriptions, Academic Press, San Diego, USA, 1994
  10. Syamlal, M. and O'Brien, T. J., Simulation of Granular Layer Inversion in Liquid Fluidized Beds, Int. J. Multiphase Flow, 14, 1988, 4, pp.473-481,
  11. Nemoda, S. Euler-Euler granular flow model of liquid fuels combustion in a fluidized reactor, J. Serb. Chem. Soc. 80, 2014, 3, pp.377-389,
  12. Davidson, J.F., Harrison, D., Fluidized Particles, Cambridge University Press, Cambridge, UK, 1963
  13. Kunii, D., Levenspiel, O., Fluidization Engineering, R.E.Krieger Publ. Co., New York, USA, 1977
  14. Milica R. Mladenović, Vertical temperature profile in the installation for the combustion of waste fuels in the fluidized bed furnace, Conference proceedings on CD-ROM, 15th Symposium on Thermal Science and Engineering of Serbia, SIMTERM 2011, Sokobanja, Serbia, 2011, pp. 490-499.
  15. Rowe, P.N., Partridge, B.A., An X-ray study of bubbles in fluidized beds, Trans. Inst. Chem. Eng., 43, 1965, pp.157-190
  16. Davis, R.M., Taylor, G.I., The mechanics of large bubbles rising through extended liquids in tubes, Proc. Roy. Soc., 200, 1950, pp.375-383

© 2023 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence