International Scientific Journal

Thermal Science - Online First

online first only

Features of propagation of droplets of water and special water-based compositions in a sample of forest fuel material

The article presents the results of experimental studies of water droplets propagation through the sample of typical forest fuel materials: needles, leaves, and their mixture. Different conditions are considered: without any additional energy supply, with heating, in the course of intensive thermal decomposition and flaming combustion. Three methods of registration are applied: thermocouple measurements; control of the weight of the sample as a whole and of its individual layers; and high-speed video recording. Water-based compositions with special additives (bentonite, bischofite, and foaming agents) typical for forest fire extinguishing systems are used. The experiments are carried out using aerosol and single water drops, as well as a small group of the latter. It is shown that the mechanisms, conditions and characteristics of droplet propagation through the layers of needles, leaves and their mixtures differ significantly. The scientific novelty of the work is the determining of the values of all the key characteristics of these processes in the conditions of intensive pyrolysis of the material, as well as through its inert layers.
PAPER REVISED: 2019-01-22
PAPER ACCEPTED: 2019-01-27
  1. Della Rocca, G., et al., Possible land management uses of common cypress to reduce wildfire initiation risk: A laboratory study, Journal of Environmental Management, 159 (2015), pp.68-77
  2. Rakowska, J., et al., Application Tests of New Wetting Compositions for Wildland Firefighting, Fire Technology, 53 (2017), pp. 1379-1398
  3. Kawahara, T., et al., Development of eco-friendly soap-based firefighting foam for forest fire, Environmental Control in Biology, 54 (2016), 1, pp. 75-78
  4. Fire and aviation management: Station fire initial attack review, The Station Fire: Lessons for Future Wildland Fire Management, 2012, pp. 70-115 (Book Chapter)
  5. Miyanishi, K., et al., Comment - A re-examination of the effects of fire suppression in the boreal forest, Canadian Journal of Forest Research, 31 (2001), pp. 1462-1466+1467-1480
  6. Wighus, R., Water mist fire suppression technology - status and gaps in knowledge, Proceedings of the international water mist conference. Vienna, 2001, pp. 1-26
  7. Volkov R.S., et al., Influence of droplet concentration on evaporation in a high-temperature gas, International Journal of Heat and Mass Transfer, 96 (2016), pp. 20-28
  8. Zhdanova A.O., et al., Thermal conditions for stopping pyrolysis of forest combustible material and applications to firefighting, Thermal Science, 21 (2017), pp. 2565-2577
  9. Kuznetsov, G.V., et al., How to improve efficiency of using water when extinguishing fires through the explosive breakup of drops in a flame: Laboratory and field tests, International Journal of Thermal Sciences, 121 (2017), pp. 398-409
  10. Voitkov I.S., et al., Temperature of gases in a trace of water droplets during their motion in a flame, Thermal science, 22 (2018), pp. 335-346
  11. Volkov R.S., et al., Fire extinction of forest fuels by droplets and water film, Thermal science, 22 (2018), pp. 347-358
  12. Zhdanova, A.O., et al., Suppression of forest fuel thermolysis by water mist, International Journal of Heat Mass Transfer, 126 (2018), pp. 703-714
  13. Volkov, R.S., et al., Movement of water drops in a forest fuel layer in the course of its thermal decomposition, Thermal Science, 22 (2018), 1, pp. 301-312
  14. Korobeinichev, O.P., et al., Combustion chemistry and decomposition kinetics of forest fuels, Procedia Engineering, 62 (2013), pp. 182-193
  15. Mračková, E., Marková, I., Parameters of the laboratory model terrestrial forest fire created from the needles of Pine (Pinus Nigra), Wood Research, 62 (2017), pp. 157-167
  16. Burrows, N.D., Flame residence times and rates of weight loss of eucalypt forest fuel particles, International Journal of Wildland Fire, 10 (2001), pp. 137-143
  17. Wadhwani, R., et al., Kinetics of pyrolysis of litter materials from pine and eucalyptus forests, Journal of Thermal Analysis and Calorimetry, 130 (2017), pp. 2035-2046
  18. Parker W.J., et al., Flash method of determining thermal diffusivity, heat capacity, and thermal conductivity, Journal of Applied Physics, 32 (1961), pp. 1679-1684
  19. Korobeinichev, O.P., et al., Fire suppression by aerosols of aqueous solutions of salts, Combustion, Explosion and Shock Waves, 46 (2010), pp. 16-20
  20. Voytkov, I.S., et al., Physicochemical processes in the interaction of an aerosol with the combustion front of forest fuel materials, Journal of Applied Mechanics and Technical Physics, 59 (2018), pp. 891-902
  21. Moskvilin, E.A. Application of aviation to extinguish forest fires, Fire safety, 1 (2009), pp. 89-92
  22. Kopylov, N.P., et al., Parameters of water dumping by airplanes during forest fire suppression, Fire safety, 2 (2015), pp. 49-55