Regression model for predicting the effectiveness of flow of film-forming fire extinguishing compositions over the surface of combustible liquid from the ratio of their components
DOI:
https://doi.org/10.33408/2519-237X.2024.8-4.437Keywords:
surfactants, surface tension, interfacial tension, full factorial experiment, regression model, foaming agentAbstract
Purpose. Development of a regression model using the full factorial experiment method to study the influence of the mass fraction of components in a solution of an aqueous film-forming fire extinguishing composition on the spreading coefficient of the aqueous film over the surface of a flammable liquid and optimizing the content of the composition components to obtain the maximum flow coefficient.
Methods. The work uses empirical research methods (measurement of surface and interfacial tension of solutions), the method of randomization and full factorial experiment to obtain a regression model, as well as the «Desirability Profiles» module of the STATISTICA software package. The determination of surface and interfacial tension of solutions of surfactants in water systems was made by the method of tearing off Du Nouy rings on an automatic tensiometer KRÜSS - K20.
Findings. The article presents the results of a complete factorial experiment, on the basis of which a regression model was obtained that describes the change in the value of the coefficient of flow of an aqueous film of film-forming fire extinguishing compositions on the surface of a flammable liquid depending on the ratio of their components. During the analysis of the complete factorial experiment, significant and insignificant factors were determined, and a ranking of significant factors was carried out according to the degree of their influence on the coefficient of flow of an aqueous film-forming fire extinguishing composition on the surface of a flammable liquid. The percentage ratio of the composition components was optimized to obtain a flow coefficient equal to 3.3 mN/m.
Application field of research. The obtained results can be used in developing the formulation of film-forming fire extinguishing compositions for extinguishing fires.
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