Characterization of water droplets size distribution in aviation turbine fuel: Ultrasonic homogeniser vs high shear speed mixer
Characterization of water droplets size distribution in aviation turbine fuel: Ultrasonic homogeniser vs high shear speed mixer
复制标题
航空涡轮燃料中水滴尺寸分布的表征：超声波均质器与高剪切速度混合器
DOI：
10.1016/j.fuel.2022.125674
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发表时间：
2023
期刊：
影响因子：
7.4
通讯作者：
Ugbeh-Johnson J
中科院分区：
文献类型：
--
作者：
Ugbeh-Johnson J
泵、接头上的压降和飞行操作（如转弯机动、起飞和着陆）是飞机燃油系统中湍流混合和剪切的许多来源之一，因此，使其成为不可避免的条件。文献确定剪切条件将影响油/水乳液中的液滴和液滴尺寸分布。因此，低强度剪切条件可能是有益的，因为它促进液滴聚结，这可能是弱乳液的驱动力。然而，迄今为止，还没有实验数据表明均化强度和总水含量对航空燃料中分散的水滴尺寸分布的影响。因此，为了扩大航空燃料中分散水滴测量的量化知识，本研究表征了航空涡轮机燃料中分散水滴的特征，改变了可用的实验室均化装置和水含量。结果表明，液滴数随含水量和剪切作用的增加而增加。为了提供更多的统计学证据，根据外推数据计算峰度和偏斜值，并与己醇/水混合物的数据进行比较，因为己醇可能形成稳定的乳液。实验结果表明，均化强度越高，乳状液越稳定，其峰度和偏斜值越高，接近于己醇/水混合物的峰度和偏斜值。因此，观察表明，温和的剪切条件（在这种情况下为高剪切混合）可以帮助促进液滴聚结，从而导致更好的分离能力。
Pumps, pressure drops across fittings, and flight operations (such as turning manoeuvres, take-off, and landing) are some of the many sources of turbulence mixing and shearing in aircraft fuel systems, therefore, making it an inevitable condition. Literature established that shearing conditions would influence the droplets and droplets size distribution in an oil/water emulsion. So, low intensity shearing conditions could be beneficial as it promotes droplets coalescence, which could be a driving force for a weak emulsion. However, to date no experimental data has shown the influence homogenising intensity and total water content has on dispersed water droplets size distribution in aviation fuel. Therefore, to expand knowledge of quantification of measurements of dispersed water droplets in aviation fuel, this study characterizes dispersed water droplets in aviation turbine fuel, varying available laboratory homogenising devices and water content. Results presented show that droplets count increases with water concentration and shearing effect. To provide more statistical evidence, kurtosis and skew values were calculated from the extrapolated data and compared with data from a hexanol/water mixture given that hexanol is likely to form a stable emulsion. Experimental results show that the higher the homogenising intensity the more stable the emulsion is likely to be with a higher kurtosis and skew value close to that for the hexanol/water mixture. Therefore, observations show that mild shearing conditions (high shear mixing in this case) could help promote droplets coalescence, leading to a better separation ability.