THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

External Links

Chekib Ghabi

,

Hmaied Benticha

,

Mohammed Sassi

PARAMETRIC STUDY OF THE HEAT TRANSFER COEFFICIENT IN BI-DIMENSIONAL SMOLDERING SIMULATION

ABSTRACT
In this paper, we present the transient modeling results of 2-D forward smoldering in a cylindrical configuration filled with a foam porous material. The objective of the study is to explain the effect of the heat losses from lateral boundaries in the front smolder propagation. The developed numerical code is capable of predicting the fire initiation and the smoldering (slow-burning) characteristics of foam insulation materials. The finite volume discretization and the bi-conjugate gradient stabilized method are used to solve the system governing equations. The chemical kinetics model is based on a first order pyrolysis reaction, followed by oxidation of the porous fuel and the carbonaceous char residual. This second oxidation reaction might promote the transition from smoldering to flaming and thus fire initiation. The gas and solid temperature, and the oxygen and the char mass fraction two-dimensional temporal evolutions are computed. Different heat and mass transfer coefficients are used to simulate the heat losses to the surrounding. Non-reacted foam regions are observed near the side wall, confirming experimental observations. The base case is chosen to represent the experimental conditions reported in the literature. The numerical predictions show very good agreement with the published experimental and 1-D numerical results.
KEYWORDS
smoldering, fixed bed, heat transfer, porous medium, finite volume method, bi-conjugate gradient stabilized method
PAPER SUBMITTED: 2006-07-22
PAPER REVISED: 2007-04-12
PAPER ACCEPTED: 2007-10-30
DOI REFERENCE: https://doi.org/10.2298/TSCI0704095G
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2007, VOLUME 11, ISSUE Issue 4, PAGES [95 - 112]
REFERENCES
  1. Ohlemiller, T. J., Modeling of Smoldering Combustion Propagation, Progress in Energy and Combustion Science, 11 (1986), 4, pp. 277-310
  2. Ohlemiller, T. J., Smoldering Combustion, in: SFPE Handbook of Fire Protection Engineering, Section 2, Chapter 11, 2nd ed. (Eds., P. J. DiNenno, C. L. Beyler, R. L. P. Custer, W. D. Walton), National Fire Protection Association, Quincy, Mass, USA, 1995, 2/171-179
  3. Torero, J. D., Fernandez-Pello, A. C., Forward Smolder of Polyurethane Foam in a Forced Air Flow, Combustion and Flame, 106 (1996), 1-2, pp. 89-109
  4. Torero, J. L., Fernandez-Pello, A. C., Kitano, M., Opposed Forced Flow Smoldering of Polyurethane Foam, Combustion Science and Technology, 91 (1993), 1-3, pp. 95-117
  5. Tse, S. D., Anthenien, R. A., Miyasaka, K., Fernandez-Pello, A. C., An Application of Ultrasonic Tomographic Imaging to Study Smoldering Combustion, Combustion and Flame, 116 (1999), 1-2, pp. 120-135
  6. Dosanjh, S. S., Pagni, P. J., Fernandez-Pello, A. C., Forced Co-Current Smoldering Combustion, Combustion and Flame, 68 (1987), 2, pp. 131-142
  7. Buckmaster, J., Lozinski, D,. An Elementary Discussion of Forward Smoldering, Combustion and Flame, 104 (1996), 3, pp. 300-310
  8. Leach, S. V., Rein, G., Ellzey, J. L., Ezekoye, O. A., A Numerical Study of Reverse Smoldering Combustion, Combustion Science and Technology, 130 (1997), 1, pp. 247-267
  9. Ghabi, C., Benticha, H., Sassi, M., Numerical Study of Olive Waste Combustion in a Fixed Bed, Physical and Chemical News, 19 (2004), pp. 53-59
  10. Ghabi, C., Rein, G., Benticha, H., Sassi, M., Bidimensionnal Numerical Model for Polyurethane Smoldering in a Fixed Bed, Proceedings, 4th International Conference on Computational Heat and Mass Transfer, Paris-Cachan, 2005, pp. 578-584
  11. Ghabi, C., Benticha, H., Sassi, M., Computational Modeling and Simulation of Forward-Smoldering of Porous Media in a Fixed Bed, Progress in Computational Fluid Dynamics, 7 (2006), 5, pp. 283-293
  12. Bar Ilan, A., Rein, G., Fernandez-Pello, A. C., Torero, J. L., Urban, D. L., Forced Forward Smoldering Experiments in Microgravity, Experimental Thermal and Fluid Science, 28 (2004), 7, pp. 743-751
  13. Di Blasi, C., Analysis of Convection and Secondary Reaction Effects within Porous Solid Fuels Undergoing Pyrolysis, Combustion Science and Technology, 90 (1993), 5, pp. 315-321
  14. Di Blasi, C., Modeling and Simulation of Combustion Processes of Charring and Non-Charring Solid Fuels, Progress in Energy and Combustion Science, 19 (1993), 1, pp. 71-104
  15. Kashiwagi, T., Nambu, H., Global Kinetic Constants for Thermal Oxidative Degradation of a Cellulosic Paper, Combustion and Flame, 88 (1992), 3-4, pp. 345-368
  16. Shafizadeh, F. F., Bradbury, A. G. W., Thermal Degradation of Cellulose in Air and Nitrogen at Low Temperature, Journal of Applied Polymer Science, 23 (1979), 11, pp. 1431-1442
  17. Chao, C. Y. H., Wang, J. H., Transition from Smoldering to Flaming Combustion of Horizontally Oriented Flexible Polyurethane Foam with Natural Convection, Combustion and Flame, 135 (2001), 4, pp. 2252-2264
  18. Wang, J. H., Chao, C. Y. H., Kong, W., Experimental Study and Asymptotic Analysis of Horizontally Forced Smoldering Combustion, Combustion and Flame, 135 (2003), 4, pp. 405-419
  19. Bilbao, R., Mastral, J. F., Aldea, M. E., Ceamanos, J., Betrán, M., Lana, J. A., Experimental and Theoretical Study of the Ignition and Smoldering of Wood Including Convective Effects, Combustion and Flame, 126 (2001), 1-2, pp. 1363-1372
  20. Shult, D. A., Matkowsky, B. J., Fernandez-Pello, A. C., Forced Forward Smolder Combustion, Combustion and Flame, 104 (1996), 1-2, pp. 1-26
  21. Leach, S. V., Rein, G., Ellzey, J. L., Ezekoye, O. A., Kinetic and Fuel Property Effect on Forward Smoldering, Combustion and Flame, 120 (2000), 3, pp. 346-358
  22. Ergun, S., Fluid Flow through Packed Columns, Chemical Engineering Progress, 48 (1952), 1, pp. 89-94
  23. Wakao, N., Kaguei, S., Heat and Mass Transfer in Packed Beds, Gordon Breach Science Publishers, New York, USA, 1982
  24. Incroprera, F. P., DeWitt, D. P., Fundamentals of Heat and Mass Transfer, Proceedings, 3rd ed., John Wiley & Sons, New York, USA, 1990
  25. Fatehi, M., Kaviany, M., Role of Gas-Phase Reaction and Gas-Solid Thermal Nonequilibrium in Reverse Combustion, International Journal of Heat and Mass Transfer, 40 (1997), 11, pp. 2607-2620
  26. Patankar, S. V., Numerical Heat Transfer and Fluid Flow, Hemisphere Publishing Corporation, Washington D. C., USA, 1980
  27. Markovic, A., An Investigation of Sparse Matrix Solvers with Applications to Models of Transport in Porous Media, Ph. D. thesis, Queensland University of Technology, Brisbane, Australia, 1995
  28. Hanneke, M. R., Ellzey, J. L., Modeling of Filtration Combustion in a Packed Bed, Combustion and Flame, 117 (1999), 4, pp. 832-840
  29. Siek, B. S. J., A Modern Framework for Portable High Performance Numerical Linear Algebra, Ph. D. thesis, University of Notre Dame, Notre Dame, Ind., USA, 1999
  30. Eisenstat, S. C., Gursky, M. C., Schultz, M. H., Sherman, A. H., The Yale Sparse Matrix Package the Symmetric Codes, International Journal for Numerical Methods in Engineering, 18 (1982), 8, pp. 1145-1151
PDF VERSION [DOWNLOAD]
Parametric study of the heat transfer coefficient in bi-dimensional smoldering simulation

© 2024 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