International Scientific Journal


Due to the rapid progress in computer hardware and software, CFD became a powerful and effective tool for implementation turbulence modeling in defined combustion mathematical models in the complex boiler geometries. In this paper the commercial CFD package, ANSYS FLUENT was used to model fluid flow through the boiler, in order to define velocity field and predict pressure drop. Mathematical modeling was carried out with application of Standard, RNG, and Realizable k-ε turbulence model using the constants presented in literature. Three boilers geometry were examined with application of three different turbulence models with variants, which means consideration of 7 turbulence model arrangements in FLUENT. The obtained model results are presented and compared with data collected from experimental tests. All experimental tests were performed according to procedures defined in the standard SRPS EN 303-5 and obtained results are presented in this paper for all three examined geometries. This approach was used for improving construction of boiler fired by solid fuel with heat output up to 35 kW and for selection of the most convenient construction.
PAPER REVISED: 2016-07-29
PAPER ACCEPTED: 2016-12-19
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THERMAL SCIENCE YEAR 2017, VOLUME 21, ISSUE Supplement 3, PAGES [S809 - S823]
  1. B. Glavonjic, Stojiljkovic, D., Manic, N., Wood Pellets Market in Serbia - Production and Opportunities for Utilization, 19th European Biomass Conference & Exhibition, ETA-Florence Renewable Energies, Berlin, Germany, 2011, pp. 2543-2548.
  2. C. Karakosta, H. Doukas, M. Flouri, S. Dimopoulou, A.G. Papadopoulou, J. Psarras, Review and analysis of renewable energy perspectives in Serbia, International Journal of Energy and Environment 2(1) (2011) pp. 71-84.
  3. R.O. SERBIA, NATIONAL RENEWABLE ENERGY ACTION PLAN OF THE REPUBLIC OF SERBIA, in: D.a.E.P. Ministry of Energy (Ed.) Beograd, 2013, p. 158.
  4. F. Fiedler, T. Persson, Carbon monoxide emissions of combined pellet and solar heating systems, Applied Energy 86(2) (2009) pp. 135-143.
  5. J. Chaney, H. Liu, J.X. Li, An overview of CFD modeling of small-scale fixed-bed biomass pellet boilers with preliminary results from a simplified approach, Energ Convers Manage 63 (2012) pp.149-156.
  6. J. Porteiro, J. Collazo, D. Patiño, E. Granada, J.C. Moran Gonzalez, J.L.s. Míguez, Numerical modeling of a biomass pellet domestic boiler, Energy & Fuels 23(2) (2009) 1067-1075.
  7. T. Klason, X.S. Bai, Computational study of the combustion process and NO formation in a small-scale wood pellet furnace, Fuel 86(10-11) pp.1465-1474.
  8. N. Manic, Optimizacija i modeliranje sagorevanja peleta od biomase u pećima za domaćinstvo (Optimisation and modeling of combustion process in household pellet stoves), Faculty of Mechanical Engineering, University of Belgrade, Belgrade, 2011.
  9. B. Amini, H. Khaleghi, A comparative study of variant turbulence modeling in the physical behaviors of diesel spray combustion, Thermal Science 15(4) (2011).
  10. J. Sodja, Turbulence models in CFD, University of Ljubljana (2007) 1-18.
  11. U. Schnell, Numerical modeling of solid fuel combustion processes using advanced CFD-based simulation tools, Progress in Computational Fluid Dynamics, an International Journal 1(4) (2001) pp.208-218.
  12. L. Davidson, An introduction to Turbulence Models, Department of Thermo and Fluid Dynamics Chalmers University of Technology Goteborg, Goteborg Sweden, 2011.
  13. P.A. Davidson, Turbulence: An Introduction for Scientists and Engineers, Second Edition ed., Oxford University Press, New York, USA, 2015.
  14. D.C. Wilcox, Turbulence modeling for CFD, DCW industries La Canada, CA1998.
  15. J. Bredberg, On two equation eddy-viscosity models, Department of Thermo and Fluid Dynamics, Chalmers University of Technology, Göteborg, Sweden (2001).
  16. A.N. Kolmogorov, The local structure of turbulence in an incompressible fluid for very large Reynolds numbers, Dokl. Akad. Nauk SSSR 30(4) (1941).
  17. A.S. Monin, Equations of turbulent motion, Journal of Applied Mathematics and Mechanics 31(6) (1967) pp.1057-1068.
  18. F.H. Harlow, P.I. Nakayama, TRANSPORT OF TURBULENCE ENERGY DECAY RATE, ; Los Alamos Scientific Lab., N. Mex., 1968, p. Medium: ED; Size: Pages: 7.
  19. M. Lopez de Bertodano, J.R.T. Lahey, O.C. Jones, Development of a k-ε Model for Bubbly Two-Phase Flow, Journal of Fluids Engineering 116(1) (1994) pp.128-134.
  20. K.-Y. Chien, Predictions of Channel and Boundary-Layer Flows with a Low-Reynolds-Number Turbulence Model, AIAA Journal 20(1) (1982) pp.33-38.
  21. B.E. Launder, D.B. Spalding, The numerical computation of turbulent flows, Computer Methods in Applied Mechanics and Engineering 3(2) (1974) pp.269-289.
  22. K. Abe, T. Kondoh, Y. Nagano, A new turbulence model for predicting fluid flow and heat transfer in separating and reattaching flows—I. Flow field calculations, International Journal of Heat and Mass Transfer 37(1) (1994) pp.139-151.
  23. ***, ANSYS Fluent 12.1 - User's guide, in: F. Inc (Ed.) Lebanon, 2006.
  24. Y.W. Lee, C. Ryu, W.J. Lee, Y.K. Park, Assessment of wood pellet combustion in a domestic stove, Journal of Material Cycles and Waste Management (2011) pp.1-8.

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