NUMERICAL INVESTIGATION OF THE LAWS OF THE "FLASH" WATER VAPORIZATION IN A FLAMING FIELD OF COMBUSTION
Abstract
The physical and mathematical models of heat and mass transfer at the heating of a water droplet with carbonic inclusion in a high-temperature (more than 800 K) gas area in a flaming field of combustion are presented in the work. The physical and mathematical formulations of the heat and mass transfer problems under conditions of phase transformations are reduced. The methods of numerical solution of the set problem are described. The numerical investigations for the wide range of parameters of the system "heterogeneous water droplet with a solid inclusion - high-temperature gas area" were conducted. Two modes of phase transformations were indicated in the concerned system: the mode of formation of "flash" vaporization centers in a field of the contact between solid inclusion and liquid (at a temperature of gas area Tf > 1050 K and a radius of heterogeneous droplet r2 > 0.3 103 m) and the mode of liquid evaporation from the free droplet surface into the field of high-temperature gases (at Tf < 1050 K and r2 < 0.3-10-3m). The distributions of temperature corresponding to each of revealed modes of phase transformations were presented. The comparison of numerical simulation results with the results of conducted before experimental investigations of evaporation of water droplets with solid inclusions during motions in a "flame" combustion field was carried out. A good agreement with the results of numerical calculation using the developed model and the results of experimental investigations was revealed.
About the Authors
O. V. Vysokomornaya
Institute of Power Engineering, National Research Tomsk Polytechnic University
Russian Federation
Russian Federation
M. V. Piskunov
Institute of Power Engineering, National Research Tomsk Polytechnic University
Russian Federation
Russian Federation
P. A. Strizhak
Institute of Power Engineering, National Research Tomsk Polytechnic University
Russian Federation
Russian Federation
References
1. Karpov A. I., Novozhilov V. B., Galat A. A., Bulgakov V.K. Numerical modeling of the effect of fine water mist on the small scale flame spreading over solid combustibles // Fire Safety Science : Proceeding of Eight International Symposium. - 2005. - Vol. 27. - P. 753-764.
2. Корольченко Д. А., Громовой В. Ю., Ворогушин О. О. Применение тонкораспыленной воды для тушения пожаров в высотных зданиях // Пожаровзрывобезопасность. - 2011. - Т. 20, № 9. - С. 54-57.
3. Ковалев А. Н., Журавлева Л. А. Перспективные направления тушения низовых лесных и степных пожаров // Научная жизнь. - 2012. -№4. - С. 153-157.
4. Соковиков В. В., Тугов А. Н., Гришин В. В., Камышев В. Н. Автоматическое водяное пожаротушение с применением тонкораспыленной воды на электростанциях // Энергетик. - 2008. - № 6. - С. 37-38.
5. Хасанов И. Р., Москвилин Е. А. Авиационные методы тушения крупных лесных пожаров // Проблемы горения и тушения пожаров на рубеже веков : матер. XV науч.-практ. конф. - М. : ВНИИПО, 1999. - Ч. 1. -С. 300-301.
6. Wighus R. Water mist fire suppression technology - status and gaps in knowledge // Proceedings of the International Water Mist Conference. - Vienna, 2001. - P. 1-26.
7. Глушков Д. О., Кузнецов Г. В., Стрижак П. А. Численное исследование тепломассопереноса при движении "тандема" капель воды в высокотемпературной газовой среде // Тепловые процессы в технике. - 2012. - Т. 4, № 12. - С. 531-538.
8. Volkov R. S., Kuznetsov G. V., Strizhak P. A. Experimental investigation of mixtures and foreign inclusions in water droplets influence on integral characteristics of their evaporation during motion through high-temperature gas area // International Journal of Thermal Sciences. - 2015. - Vol. 88. - P. 193-200. doi: 10.1016/j.ijthermalsci.2014.10.002.
9. Яворский Б. М. Справочник по физике. - М. : Наука, 1979. - 942 с.
10. Самарский А. А. Теория разностных схем. - М. : Наука, 1983. - 616 с.
11. Коздоба Л. А. Методы решения нелинейных задач теплопроводности. - М. : Наука, 1975. - 227 с.
12. Vysokomornaya O. V., Kuznetsov G. V., Strizhak P. A. Numerical analysis of heat-mass transfer mechanisms in gas-phase ignition of films of liquid condensed substances by a laser beam // Journal of Engineering Thermophysics.-2010.-Vol. 19,no.2.-P. 85-93.doi: 10.1134/S1810232810020049.
13. Glushkov D. O., Strizhak P. A. Transient heat and mass transfer of liquid droplet ignition at the spreading over the heated substrate // Advances in Mechanical Engineering. - 2014. - Vol. 2014. - Art. ID 269321. -9 p. doi: 10.1155/2014/269321.
14. Кнаке О., Странский И. Н. Механизм испарения // Успехи физических наук. - 1959. - Т. 68, №2.- С. 261-305.
15. Варгафтик Н. Б. Справочник по теплофизическим свойствам газов и жидкостей. - М. : ООО "Старс", 2006. - 720 с.
16. Теплотехнический справочник / Под ред. В. Н. Юренева, П. Д. Лебедева. - М.: Энергия, 1975. -Т.1,2.
17. Кузнецов Г. В., Барановский Н. В. Прогноз возникновения лесных пожаров и их экологических последствий. - Новосибирск : Изд-во СО РАН, 2009. - 301 с.
Review
For citations:
Vysokomornaya O.V., Piskunov M.V., Strizhak P.A. NUMERICAL INVESTIGATION OF THE LAWS OF THE "FLASH" WATER VAPORIZATION IN A FLAMING FIELD OF COMBUSTION. Pozharovzryvobezopasnost/Fire and Explosion Safety. 2015;24(5):5-10. (In Russ.)
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