Flame Propagation Across Gelled Alkane-In-Water Emulsions

J.C.Y Lee , J.D Felske , N Ashgriz
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引用次数: 3

Abstract

Flame propagation rates were measured for flames spreading across surfaces of gel-like alkane-in-water emulsions. A long, slender, water-cooled trough was used to contain the mixtures. Abrupt changes in the flame propagation velocities – of nearly two orders of magnitude – were observed to occur near ‘critical’ concentrations of certain alkane/water mixtures. Four alkanes were used – pentane, hexane, heptane, and octane – and fuel rich emulsions (in which water was the continuous phase) were employed. The ability of the aqueous phase of the emulsion to inhibit the release of fuel into the vapor phase plays an important role in the observed behavior. That is, the rate at which fuel can diffuse through both the emulsion and the thin liquid layers that reside on it, is an essential kinetic aspect of the phenomena which determine the flame propagation rate across gelled alkane-in-water emulsions.

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火焰在凝胶水内烷烃乳液中的传播
测量了火焰在凝胶状水内烷烃乳液表面上的传播速率。一个细长的水冷槽用来盛装混合物。在某些烷烃/水混合物的“临界”浓度附近,火焰传播速度的突然变化——接近两个数量级——被观察到。使用四种烷烃-戊烷,己烷,庚烷和辛烷-和燃料丰富的乳剂(其中水是连续相)。乳液的水相抑制燃料向气相释放的能力在观察到的行为中起着重要的作用。也就是说,燃料在乳液及其上的薄液体层中扩散的速率,是决定火焰在凝胶化的水内烷烃乳液中传播速率的现象的基本动力学方面。
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