Publication de 12 numéros par an
ISSN Imprimer: 1044-5110
ISSN En ligne: 1936-2684
Indexed in
DISINTEGRATION OF LARGE BALLS OF WATER-BASED LIQUIDS IN FREE FALL THROUGH HIGH-TEMPERATURE GASES
RÉSUMÉ
This paper presents an experimental study of the transformation (i.e., deformation and disintegration) of liquid balls in free fall through a gaseous environment at temperatures from 300 to 1100 K. The experiments involve the use of the following liquids: water, NaCl solution, and a suspension with carbon particles; the initial volume of liquid balls ranges from 0.05 l to 1 l. We apply high-speed video cameras, Phantom V411 and Phantom Miro M310 (up to 6 × 105 frames per second), and Tema Automotive software, providing the ability to track objects continuously. The study establishes the mechanism of deformation and disintegration of liquid balls. The following factors influence characteristics of these processes: the initial volume of liquid balls, their component composition, the velocity of the side airflow (wind), and the temperature of gases (i.e., air and combustion products). In addition, the Weber numbers are determined for the transitions between the transformation stages of the liquid balls. The determination of Weber numbers is necessary for illustrating the limiting conditions at which the breakup of liquid balls and the transition from one stage of deformation to another occur. The research illustrates the limitations of an increase in transverse and longitudinal sizes of liquid balls during deformation under conditions corresponding to extinguishing fires. The results substantiate the necessity of spraying water for covering a larger fire area. In the case of the local water discharge, batches of liquids transform to clouds consisting of droplets with small transverse sizes even after falling several dozens of meters. Combustion products heated up to high temperatures essentially decelerate a transition from the monolithic ball of water to the droplet cloud and limit its transverse size. This limitation is associated with the intensive evaporation and the formation of buffer vapor zones between combustion products and the droplet cloud.
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Antonov D. V., Atroshenko Yu. K., Kopylov N. P., Khasanov I. R., Numerical simulation of entrainment of water fragments from the zone of localization of combustion and pyrolysis of forest fuel materials by air flow, INTERNATIONAL YOUTH SCIENTIFIC CONFERENCE “HEAT AND MASS TRANSFER IN THE THERMAL CONTROL SYSTEM OF TECHNICAL AND TECHNOLOGICAL ENERGY EQUIPMENT” (HMTTSC 2019), 2135, 2019. Crossref
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Kuznetsov G. V., Zhdanova A. O., Strizhak P. A., Atroshenko Yu. K., Influence of the Method of Water Supply to the Zone of a Forest Fire on the Efficiency of its Extinguishing, Journal of Engineering Physics and Thermophysics, 93, 6, 2020. Crossref
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Volkov R. S., Kuznetsov G. V., Strizhak P. A., Suppression of Flaming Combustion and Thermal Decomposition of Condensed Matter at Different Heights of the Beginning of Water Array Motion, Combustion, Explosion, and Shock Waves, 56, 1, 2020. Crossref
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Kuznetsov Genii, Zhdanova Alena, Voitkov Ivan, Strizhak Pavel, Disintegration of Free-falling Liquid Droplets, Jets, and Arrays in Air, Microgravity Science and Technology, 34, 2, 2022. Crossref
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Zhdanova A. O., Zakharevich A. V., Kuznetsov G. V., Ponomarev K. O., Analysis of the Efficiency of Combined Barrier Strips for Localizing the Burning of Needles and Leafage, Journal of Engineering Physics and Thermophysics, 95, 4, 2022. Crossref