THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

online first only

Thermal conditions for stopping pyrolysis of forest combustible material and applications to firefighting

ABSTRACT
Five models describing heat transfer during evaporation of the water sprayed over the forest to stop fires and to cool down the pyrolysis of the bio- top layer are established and investigated by a parametric approach. It aims to improve the understanding of the behavior and the properties of the forest combustible material (FCM). A mathematical description of FCM surfaces (needles of pine and fir-tree, leaves of birch) is established. The characteristic time td to cool down the FCM layer below the temperature of the onset of the pyrolysis is the important parameter investigated in the present work. The effective conditions were determined allowing to reach the shortest td time and the lowest consumption of e.g. water to be dropped.
KEYWORDS
PAPER SUBMITTED: 2015-10-06
PAPER REVISED: 2016-05-05
PAPER ACCEPTED: 2016-05-16
PUBLISHED ONLINE: 2016-05-30
DOI REFERENCE: https://doi.org/10.2298/TSCI151006121Z
REFERENCES
  1. McAllister, S., Critical Mass Flux for Flaming Ignition of Wet Wood, Fire Saf. J., 61 (2013), pp. 200-206
  2. Korobeinichev, O.P., et al, Fire Suppression by Low-Volatile Chemically Active Fire Suppressants Using Aerosol Technology, Fire Saf. J., 51 (2012), pp. 102-109
  3. Xiao, X.K., et al, On the Behavior of Flame Expansion in Pool Fire Extinguishment with Steam Jet, J Fire Sci, 29(4) (2011), pp. 339-360
  4. Vysokomornaya, O.V., et al, Experimental Investigation of Atomized Water Droplet Initial Parameters Influence on Evaporation Intensity in Flaming Combustion Zone, Fire Saf. J., 70 (2014), pp. 61-70
  5. Tang, Z., et al, Experimental Study of the Downward Displacement of Fire-Induced Smoke by Water Sprays, Fire Saf. J., 55 (2013), pp. 35-49
  6. Joseph, P., et al, A Comparative Study of the Effects of Chemical Additives on the Suppression Efficiency of Water Mist, Fire Saf. J., 58 (2013), pp. 221-225
  7. Yoshida, A., et al, Experimental Study of Suppressing Effect of Fine Water Droplets on Propane/Air Premixed Flames Stabilized in the Stagnation Flowfield, Fire Saf. J., 58 (2013), pp. 84-91
  8. Qie, J., et al, Experimental Study of the Influences of Orientation and Altitude on Pyrolysis and Ignition of Wood, J. Fire Sci., 29(3) (2011), pp. 243-258
  9. Rossi, J.L., et al, An Analytical Model Based on Radiative Heating for the Determination of Safety Distances for Wildland Fires, Fire Saf. J., 46(8) (2011), pp. 520-527
  10. Grishin, A.M., Mathematical Modeling of Forest Fire and New Methods of Fighting them, Publishing House of Tomsk State University, Tomsk, 1997 (in Russian)
  11. Grishin, A.M., et al, Comparative Analysis of Thermokinetic Constant of Drying and Pyrolysis of Forest Fuels, Combustion and Explosion Physics J., 27 (1991), pp. 17-24
  12. Lautenberger, C.H., Fernando-Pello, C.A., A Model for the Oxidative Pyrolysis of Wood, Combust Flame, 156 (2009), pp. 1503-1513
  13. Yao, B., et al, Experimental Study of Suppressing Poly (Methyl Metacrylate) Fires Using Water Mists, Fire Saf. J., 47 (2012), pp. 32-39
  14. Vysokomornaya, O.V., et al, Heat and Mass Transfer in the Process of Movement of Water Drops in a High-Temperature Gas Medium, J. Eng. Phys. Thermophys, 86(1) (2013), pp. 62-68
  15. Strizhak, P.A., Influence of Droplet Distribution in a "Water Slug" on the Temperature and Concentration of Combustion Products in its Wake, J. Eng. Phys. Thermophys, 86(4) (2013), pp. 895-904
  16. Vargaftik, N.B., et al, Handbook of Thermal Conductivity of Liquids and Gases, CRC Press, Boca Raton, 1994
  17. Patel (Ed.), V., Chemical Kinetics, Rijeka, Croatia, 2012
  18. Frank-Kamenetsky, D.A., Diffusion and Heat Transfer in Chemical Kinetics, Plenum, New York, 1969
  19. Baehr, H.D., Stephan, K., Heat and Mass Transfer, Springer Verlag, Berlin, 1998
  20. Kryukov, A.P., et al, About Evaporation-Condensation Coefficients on the Vapor-Liquid Interface of High Thermal Conductivity Matters, Int. J. Heat and Mass Transfer, 54 (2011) 13-14, pp. 3042-3048
  21. Zhdanova, A.O., et al, Numerical Investigation of Physicochemical Processes Occurring During Water Evaporation in the Surface Layer Pores of a Forest Combustible Material, J. Eng. Phys. Thermophys, 87(4) (2014), pp. 773-781
  22. McAllister, S., et al. Piloted Ignition of Live Forest Fuels, Fire Saf. J., 51 (2012), pp. 133-142
  23. Samarskii, A.A., The Theory of Difference Schemes, Marcel Dekker, USA, 2001
  24. Gumerov, V.M., et al, Determination of Characteristic Periods of Suppression of Thermal Decomposition Reaction of Forest Fuel Material by Specialized Software, MATEC Web of Conferences, 37(01022) (2015), pp. 1-4