1 State Grid Anhui Electric Power Research Institute, Anhui Province Key Laboratory of Electric Fire and Safety Protection (State Grid Laboratory of Fire Protection for Transmission and Distribution Facilities), Electric Power Fire Technology Professional Committee of Anhui Society for Electrical Engineering, Hefei 230601, China 2 State Grid Anhui Electric Power Co., Ltd., Hefei 230022, China 3 College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Abstract: Aqueous film-forming foam (AFFF) is the most effective extinguishing medium for large-scale oil fires, and its rheology has a great influence on its application. In order to investigate the AFFF rheology, the flow behavior and viscoelasticity of four commercial AFFF concentrates (two ordinary 3%AFFF and 6%AFFF, two alcohol resistant 3%AR-AFFF and 6%AR-AFFF) and foams at different temperatures were studied. The results show that the four kinds of AFFF concentrates have obvious shear thinning behavior, and the flow curves of the AFFF concentrates are consistent with the Cross model. The two AR-AFFF concentrates exhibit the properties of viscoelastic solids with high yield limits, while the two ordinary AFFF concentrates show the characteristics of viscoelastic fluid. All four AFFF foams also exhibit shear-thinning behavior, and the flow curves are consistent with the Herschel-Bulkley model. All four foams exhibit viscoelastic fluid characteristics, and the loss modulus (G″) is always greater than the storage modulus (G′). The shear stress, apparent viscosity, G′, G″ and other parameters of the four foams decrease gradually with the increase of temperature, and show an obvious dependence on temperature. The difference in the rheology of AFFF depends mainly on the constituent components (surfactants and polysaccharide polymers). The results of this work are helpful to promote the efficient application of new AFFF in fire.
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2025, Vol. 39 
