Abstract
On the basis of experimental studies it was revealed that adding of electrolyte - ammonium chloride - into solution of film-forming foaming agent leads to decrease of interfacial tension on a border with heptane, and increase of surface tension on a border with air. It is experimentally shown that dependence between specific consumption and flow rate of foaming agent passes through the minimum point that allowed defining influence of electrolyte on a value of minimum specific consumption and optimum flow rate of foam during extinguishing of a hydrocarbon flame. The structure of spreading in a foaming agent solution – hydrocarbon system defines the value of fire extin-guishing efficiency of foam decreasing together with lowering of spreading coefficient and interfacial tension.
Highlights
The structure of spreading in a solution-hydrocarbon system mainly defines fire extinguishing efficiency of foam during extinguishing of the flame of oil products [1-4].Spreading in a solution - hydrocarbon system has a complex structure which is firstly divided by sign and value of spreading coefficient of aqueous solution, flowing over hydrocarbon, and hydrocarbon, flowing over aqueous solution
The positive sign of spreading coefficient of aqueous solution is provided due to application of fluorinated SAS, whereas spreading coefficient of heptane could have the positive sign in case of application of hydrocarbon SAS
Сurves of dependence of specific consumption on flow rate of foam solution are presented in fig. 2
Summary
The structure of spreading in a solution-hydrocarbon system mainly defines fire extinguishing efficiency of foam during extinguishing of the flame of oil products [1-4].Spreading in a solution - hydrocarbon system has a complex structure which is firstly divided by sign and value of spreading coefficient of aqueous solution, flowing over hydrocarbon, and hydrocarbon, flowing over aqueous solution. Positive value of spreading coefficient of aqueous solution causes high fire extinguishing efficiency of foam giving onto the burning surface and into the bottom of tank, directly into the layer of fuel [9-16]. Сurves of dependence of specific consumption on flow rate of foam solution are presented in fig.
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