Evaporation and liquid-phase separation of ethanol-cyclohexane binary drops under acoustic levitation
Evaporation and liquid-phase separation of ethanol-cyclohexane binary drops under acoustic levitation
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DOI：
10.1063/5.0109520
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发表时间：
2022-09-01
影响因子：
4.6
通讯作者：
Zang, Duyang
中科院分区：
文献类型：
--
作者：
Chen, Hongyue;Li, Anna;Zang, Duyang
研究了声悬浮条件下环己烷和乙醇二元液滴的蒸发特性。目的是了解声悬浮对蒸发动力学的影响，并涉及二元液滴的物理过程。我们报告的发生液相分离的二元滴蒸发过程中声悬浮。通过系统的实验，发现声悬浮条件下液滴蒸发速率的提高导致了液滴温度的显著降低。此外，在外部声流的驱动下，水蒸气倾向于在水滴表面富集和凝结。由于乙醇极易溶于水，由于水冷凝，从乙醇中提取出微小的环己烷液滴。此外，在声悬浮液滴内部流动的驱动下，提取的环己烷液滴聚结，最终导致液滴中的宏观偏析。这些研究结果提供了新的见解声悬浮液滴的蒸发动力学，从而阐明工业净化和分离挥发性液体与相反的水溶性，如环己烷和乙醇。
Evaporation of cyclohexane and ethanol binary drops under acoustic levitation was investigated. The aim was to understand the effect of acoustic levitation on the evaporation dynamics and involved physical processes of the binary drops. We report the occurrence of liquid-phase separation of the binary drop during evaporation under acoustic levitation. Through systematic experiments, it was found that the enhanced evaporation rate of the drop under acoustic levitation led to a significant temperature decrease. In addition, driven by external acoustic streaming, water vapor tended to be enriched and condensed on the drop surface. Because ethanol is extremely soluble in water, tiny cyclohexane droplets were extracted from ethanol owing to water condensation. In addition, driven by the internal flow of the acoustically levitated drop, the extracted cyclohexane droplets coalesced, eventually resulting in macro-segregation in the drop. These findings provide new insights into the evaporation dynamics of acoustically levitated drops, thus, shedding light on industrial purification and separation of volatile liquids with opposite water solubilities, such as cyclohexane and ethanol.