Probing the Evaporation Dynamics of Ethanol/Gasoline Biofuel Blends Using Single Droplet Manipulation Techniques
Probing the Evaporation Dynamics of Ethanol/Gasoline Biofuel Blends Using Single Droplet Manipulation Techniques
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DOI：
10.1021/acs.jpca.5b10098
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发表时间：
2015-12-24
影响因子：
2.9
通讯作者：
McGloin, David
中科院分区：
文献类型：
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作者：
Corsetti, Stella;Miles, Rachael E. H.;McGloin, David
与使用纯化石燃料相比，使用生物乙醇和汽油的混合物作为汽车燃料可导致有害排放物的净减少。然而，燃料滴蒸发动力学根据混合比而变化。在这里，我们使用单粒子操纵技术来研究乙醇/汽油混合微滴的蒸发动力学。使用电动天平可以测量受控环境中单个液滴的蒸发情况，而光镊则有助于研究喷雾内液滴的行为。因此，两种方法的结合非常适合获得蒸发过程的完整图像。研究了在汽油中添加不同量的乙醇的影响，我们观察到乙醇含量较高的液滴需要更长的时间才能蒸发。此外，我们发现我们的方法足够灵敏，可以观察液滴中痕量水的存在。使用预测干燥氮气中乙醇和汽油液滴蒸发的理论模型来解释实验结果。还对镊子中环境中其他气溶胶的饱和度进行了理论估计。
Using blends of bioethanol and gasoline as automotive fuel leads to a net decrease in the production of harmful emission compared to the use of pure fossil fuel. However, fuel droplet evaporation dynamics change depending on the mixing ratio. Here we use single particle manipulation techniques to study the evaporation dynamics of ethanol/gasoline blend microdroplets. The use of an electrodynamic balance enables measurements of the evaporation of individual droplets in a controlled environment, while optical tweezers facilitate studies of the behavior of droplets inside a spray. Hence, the combination of both methods is perfectly suited to obtain a complete picture of the evaporation process. The influence of adding varied amounts of ethanol to gasoline is investigated, and we observe that droplets with a greater fraction of ethanol take longer to evaporate. Furthermore, we find that our methods are sensitive enough to observe the presence of trace amounts of water in the droplets. A theoretical model, predicting the evaporation of ethanol and gasoline droplets in dry nitrogen gas, is used to explain the experimental results. Also a theoretical estimation of the saturation of the environment, with other aerosols, in the tweezers is carried out.