As water removal becomes more important in transportation systems (ground and aviation), a better understanding of the generated water emulsions is required to remove any water contamination. Traditionally, the industry only measures the quantity of water challenging a test filter and the resultant effluent to calculate the percent water removal efficiency. With more fuel additives and alternative fuels coming into the market, variations in water removal properties such as interfacial tension (TFT) are much lower than the industry traditionally finds in the field. This property has a major impact on water removal characteristics and water droplet size distribution. We have always been able to measure the IFT, but until recently, we have been able to determine the water droplet size distributions. This paper will present water droplet size distributions of various fuels with a range of IFT values to demonstrate the impact of fuel additives and alternative fuels such as biodiesel and synthetic jet fuels.
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