Influence of the dimensions of the grid cell and the distance from it to the nozzle of the foam-generating device on the foam dispersion
DOI:
https://doi.org/10.33408/2519-237X.2022.6-4.441Keywords:
foam, bubble diameter, bubble blowing speed, dispersionAbstract
Purpose. To experimentally evaluate the influence of the size of the grid cell and the distance from the nozzle to it on the dispersion of the resulting air-mechanical foam. Based on the obtained experimental data, check the adequacy of theoretical calculations of the diameter of the bubble formed on the flooded and non-flooded holes.
Methods. In the course of the work the main theoretical and empirical research methods were used. To determine the diameter of foam bubbles the multifunctional graphic editor GIMP was used.
Findings. Empirical data on the diameter of foam bubbles were obtained for the following ranges of variable parameters: grid cell size from 0.5 × 0.5 to 3.2 × 3.2 mm; foaming solution jet velocity at the nozzle outlet from 7 to 17 m/s and the distance from the nozzle outlet to the grid from 50 to 400 mm. It was established that at a distance of 200 mm from the nozzle outlet to the grid the average diameter of the foam bubbles was closest to the theoretically calculated values (deviation no more than 26 %, average deviation 14 %).
Application field of research. Development of devices for generating air-mechanical foam on the grids.
References
Tikhomirov V.K. Peny. Teoriya i praktika ikh polucheniya i razrusheniya [Foams. Theory and practice of their obtainig and destruction]. Moscow: Khimiya, 1975. 263 p. (rus)
Kamlyuk A.N., Grachulin A.V. Kompressionnaya pena dlya nuzhd pozharnykh podrazdeleniy [Compressed air foam for the needs of fire departments]: monograph. Minsk: University of Civil Protection, 2019. 223 p. (rus)
Salkin L., Schmit A., Panizza P., Courbin L. Generating Soap Bubbles by Blowing on Soap Films. Physical Review Letters, 2016. Vol. 116, Iss. 7. Article 077801. DOI: https://doi.org/10.1103/PhysRevLett.116.077801.
Kamluk A.N., Morozov A.A., Parmon V.V. Stvol pozharnyy ruchnoy universal'nyy kombinirovannyy s raskhodom do 5 l/s i vozmozhnost'yu formirovaniya vozdushno-mekhanicheskoy peny [Universal firefighter manual fire barrel combined with a flow rate of up to 5 l/s and the possibility of forming an air-mechanical foam]. Nauchnye i obrazovatel'nye problemy grazhdanskoy zashchity, 2019. No. 1 (40). Pp. 76–85. (rus). EDN: https://elibrary.ru/ZEUEPZ.
Tran D.H., Kamlyuk A.N., Likhomanov A.O., Grachulin A.V., Platonov A.S., Titovets A.F. Otsenka diametra puzyr'kov i skorosti potoka penoobrazuyushchey smesi dlya ikh obrazovaniya na setke penogeneriruyushchikh ustroystv [Evaluation of the bubbles diameter and the blowing speed of the air-mechanical foam forming bubbles on the screen of the foam generators]. Journal of Civil Protection, 2022. Vol. 6, No. 1. Pp. 84–94. (rus). DOI: https://doi.org/10.33408/2519-237X.2022.6-1.84. EDN: https://elibrary.ru/QAEHWG.
Likhomanov А.О., Kamlyuk А.N. Dlina nachal'nogo uchastka osesimmetrichnoy turbulentnoy strui, obrazuyushcheysya v pennom rozetochnom orositele dlya avtomaticheskikh ustanovok pozharotusheniya [The breakup length of axisymmetric turbulent jet in the foam deflector type sprinkler for automatic extinguishing systems]. Journal of Civil Protection, 2021. Vol. 5., No. 2. Pp. 159–173. (rus). DOI: https://doi.org/10.33408/2519-237X.2021.5-2.159. EDN: https://elibrary.ru/ZRNKUV.
Kachanov, I.V., Karpenchuk I.V., Pavlyukov S.Yu. Ustanovki avtomaticheskogo pozharotusheniya s predvaritel'noy aeratsiey ognetushashchey rabochey sredy [Automatic fire extinguishing installations with preliminary aeration of the fire extinguishing working environment]. Minsk: Belarusian National Technical University, 2018. 149 p. (rus)
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Copyright (c) 2022 Kamlyuk A.N., Likhomanov A.O., Titovets A.F., Polochanin N.S., Grachulin A.V.
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