On bubble generation regimes in a surfactant solution for producing compression foam

Authors

  • Andrey N. Kamlyuk State Educational Establishment «University of Сivil Protection of the Ministry for Emergency Situations of the Republic of Belarus»; 220118, Belarus, Minsk, Mashinostroiteley str., 25 https://orcid.org/0000-0002-9347-0778
  • Igor' S. Gusarov State Educational Establishment «University of Сivil Protection of the Ministry for Emergency Situations of the Republic of Belarus»; 220118, Belarus, Minsk, Mashinostroiteley str., 25 https://orcid.org/0000-0002-0665-8212
  • Stanislav A. Masyuk State Educational Establishment «University of Сivil Protection of the Ministry for Emergency Situations of the Republic of Belarus»; 220118, Belarus, Minsk, Mashinostroiteley str., 25 https://orcid.org/0009-0002-4289-1676

DOI:

https://doi.org/10.33408/2519-237X.2026.10-2.204

Keywords:

surfactant, compression foam, bubbles, barbotage, Reynolds number, Weber number, Froude number, Mach number, capillarity number, Bond number, Morton number

Abstract

Purpose. To investigate the regimes of bubble generation in a surfactant solution for producing compression foam and their geometric characteristics at a submerged orifice. Based on the obtained experimental data, to identify and describe the principal regimes of bubble generation in a surfactant solution for producing compression foam. To determine the characteristic Reynolds, Weber, Froude, Mach, capillarity, Bond and Morton numbers that can be used to assess the bubble generation regimes in a surfactant solution for producing compression foam and their geometric characteristics at a submerged orifice.

Methods. The general methodology of the work involved the use of theoretical (analysis, synthesis, comparison) and experimental research methods. The methods of visualization and photography, digital image processing, and a computational method were applied.

Findings. Three successively alternating modes of bubble generation in a surfactant solution at a submerged orifice were experimentally established: bubble, garland (transitional), and jet. The criteria for these modes were determined: for bubble: Reynolds number – Re < 1000, Weber – We ≤ 15, capillarity – Camax = 0.018, Mach – Mmax = 0.075, and the average gas content – φavmin = 0.769, φavmax = 0.997; for garland: 1000 ≤ Re ≤ 2000, 3 ≤ We ≤ 45, Camax = 0.031, Mmax = 0.129, φavmin = 0.954, φavmax = 0.998; for jet: Re > 2000, We ≥ 80, Camin = 0.029, Mmin = 0.123, φavmin = 0.998. It is shown that even at low air velocities, deformed (elliptical) bubbles are generated in a solution with surfactants as confirmed by the Bond number values Bo > 1 and Geometric characteristics are defined for each mode: for the bubble mode, the equivalent bubble diameter and the interbubble pitch; for the garland mode, the distance between the garland and the bubbles and the garland height; and for the jet mode, the torch height and its opening angle. The jet mode is considered the most effective in terms of gas saturation and bubble dispersion.

Application field of research. Research of the modes of bubble generation in a surfactant solution for obtaining compression foam and their geometric characteristics at a submerged orifice can be used to optimize barbotage processes for fire extinguishing, flotation, food production, and the production of porous materials.

Author Biographies

Andrey N. Kamlyuk, State Educational Establishment «University of Сivil Protection of the Ministry for Emergency Situations of the Republic of Belarus»; 220118, Belarus, Minsk, Mashinostroiteley str., 25

Scientific Secretary; PhD in Physical and Mathematical Sciences, Associate Professor

Igor' S. Gusarov, State Educational Establishment «University of Сivil Protection of the Ministry for Emergency Situations of the Republic of Belarus»; 220118, Belarus, Minsk, Mashinostroiteley str., 25

Faculty of Postgraduate Scientific Education, Head of Laboratory

Stanislav A. Masyuk, State Educational Establishment «University of Сivil Protection of the Ministry for Emergency Situations of the Republic of Belarus»; 220118, Belarus, Minsk, Mashinostroiteley str., 25

Faculty of Postgraduate Scientific Education, Engineer

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Published

2026-05-27

How to Cite

Kamlyuk А. Н., Gusarov И. С. and Masyuk С. А. (2026) “On bubble generation regimes in a surfactant solution for producing compression foam”, Journal of Civil Protection, 10(2), pp. 204–214. doi: 10.33408/2519-237X.2026.10-2.204.

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Technologies and software in the sphere of emergency prevention and elimination

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