Influence of spreading structure in an aqueous solution-hydrocarbon system on extinguishing of the flame of oil products

Abstract

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.

Fire extinguishing efficiency of hydrocarbon and fluorinated film-forming foaming agent

“…The higher the spreading coefficient value is, the more efficient is the foam in extinguishing petroleum products [13][14][15][16][17].…”

Efficiency evaluation criteria of communication paths structure in a complex of buildings of maternity and child-care institutions

“…Analysis of the relationship of these criteria shows that the width of the communication path should be designated in accordance with the acceptable level of comfort (Table 1), its length is determined by the conditions of ensuring the timely evacuation (2) of the most sedentary demographic group of visitors in case of emergency. On the assumption of the set [25,33,39,42,43] invariance of a function V= (D), the speed (Vj) is determined by the general pattern: …”

Determining the effectiveness of protective fences from explosions of terroristic orientation

“…For free spaces, the BSW parameters can be determined from empirical relations [1][2][3][4], and for cluttered spaces (there are protective screens on the BSW's path), it is necessary to use numerical calculation methods. To determine BSW's parameters, we use a numeric scheme from Godunov's scheme based on the breakdown of an arbitrary discontinuity [5][6][7][8][9].…”