THE EFFECT OF DROP SIZE ON FLAME PROPAGATION IN LIQUID AEROSOLS
THE EFFECT OF DROP SIZE ON FLAME PROPAGATION IN LIQUID AEROSOLS
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DOI：
10.1098/rspa.1954.0210
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发表时间：
1954-01-01
影响因子：
--
通讯作者：
COHEN, L
中科院分区：
文献类型：
--
作者：
BURGOYNE, JH;COHEN, L
已经开发出一种方法，通过该方法可以从纯液体制备受控的均匀液滴尺寸的悬浮液。使用四氢化萘作为燃料，因此可以在一定范围内研究液滴尺寸对空气中液体悬浮液燃烧特性的影响。通过对可燃性极限、氮气稀释极限和燃烧速度的研究表明，在7至55μ的液滴尺寸范围内，火焰传播机制完全转变。低于 10μ 时，悬浮液表现得像蒸气，但高于 40μ 时，液滴在各自的空气包层中单独燃烧，一个燃烧的液滴会点燃相邻的液滴，从而扩散燃烧。在中等尺寸下，行为是过渡性的。这种转变的实际结果是可燃性浓度下限降低，并且较大液滴的燃烧速率增加。
A method has been developed whereby suspensions of controlled uniform drop size can be prepared from pure liquids. Using tetralin as the fuel, it has thus been possible, within limits, to study the effect of the drop size on the combustion properties of a liquid-in-air suspension. Through a study of limits of inflammability, nitrogen dilution limits and burning velocities, it has been shown that the mechanism of flame propagation is completely transformed within the drop-size range 7 to 55μ. Below 10μthe suspension behaves like a vapour, but above 40μthe drops burn individually, in their own air envelope, and one burning drop ignites adjacent ones, thus spreading combustion. At intermediate sizes, behaviour is transitional. A practical consequence of this transformation is that the lower concentration limit of inflammability is reduced and the rate of burning increased for the larger drops.