Influence of interfacial tension on flow rate and specific consumption of fluorinated foaming agent, containing added ammonium chlorideJournal: Pozharovzryvobezopastnost/Fire and Explosion Safety (Vol.27, No. 2)
Publication Date: 2018-03-25
In the work, the influence of surface and interfacial tension on the optimum flow rate of an aqueous solution of a fluorinated - foaming agent with the addition of ammonium chloride was determined. Also, the dependence of the time of extinguishing the flame of heptane from the flow rate of foam, obtained from aqueous-salt solution of foaming agent was discovered. Therefore, the dependence of the optimal flow rate and minimum specific foaming agent solution from the value of the coefficient of the spreading of water-salt solution on the surface of heptane's was defined. It was established that with increasing concentration of the electrolyte (ammonium chloride), surface and interfacial tension is reducing, the fire extinguishing efficiency of the foam is also declining, resulting in increasing of the optimal flow rate of foaming solution and also in increasing of the specific consumption. It is shown that as the interfacial tension decreases, the minimum consumption of the foaming agent and the optimum flow rate of the foam supply increases, and the quench time decreases synchronously. It is determined that with changing of the size of interfacial tension, the curves have a pronounced minimum, which is shifted. It is revealed that the decrease in the ability of the fuel to spread over a solution of foam films leads to an increase in the fire-extinguishing efficiency, which is manifested in a reduction in the minimum specific consumption and the optimum flow rate of supply of the foaming solution.
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