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Evaporation and drying kinetics of water-NaCl droplets via acoustic levitation

机译：通过声悬浮蒸发和干燥水滴液滴动力学

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摘要

The acoustic levitation method (ALM) is expected to be applied as a container-less processing technology in the material science, analytical chemistry, biomedical technology, and food science domains because this method can be used to levitate any sample in mid-air and prevent nucleation and contamination due to the container wall. However, this approach can lead to nonlinear behavior, such as acoustic streaming, which promotes the evaporation of a levitated droplet. This study aims to understand the evaporation and precipitation kinetics of an acoustically levitated multicomponent droplet. An experimental investigation of the evaporation process of a salt solution droplet was performed, and the experimental results were compared with those of the d(2)-law. The droplet was noted to evaporate in two stages owing to the precipitation of the salt. Because of the vapor pressure depression, the experimental data did not agree with the classical prediction obtained using the d(2)-law. However, the experimental results were in partial agreement with those of the d(2)-law when the vapor pressure depression was considered by using the concentration estimate at each time, as obtained from the experimental results. In addition, it was observed that the time when the salt completely precipitated could be estimated by using the extended theory. These findings provide physical and practical insights into the droplet evaporation mid-air for potential lab-in-a-drop applications.
机译：预计声悬浮法（ALM）将被应用于材料科学，分析化学，生物医学技术和食品科学域中的容器的加工技术，因为这种方法可用于浮出中空中的任何样品并防止由于容器壁引起的成核和污染。然而，这种方法可以导致非线性行为，例如声学流，促进悬浮液滴的蒸发。本研究旨在了解声学升高的多组分液滴的蒸发和降水动力学。进行了对盐溶液液滴蒸发过程的实验研究，并将实验结果与D（2）-AV的蒸发结果进行了比较。由于盐的沉淀，注意到液滴以两个阶段蒸发。由于蒸汽压力凹陷，实验数据不同意使用D（2）-LAW获得的经典预测。然而，当通过在每次使用实验结果中获得的浓度估计考虑蒸汽压力抑制时，实验结果与D（2）释放的施变部分协议。此外，观察到通过使用扩展理论可以估计完全沉淀的时间。这些调查结果为潜在的实验室内应用提供了物理和实用的见解，用于潜在的实验室内应用。

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  • 来源
    《RSC Advances》 |2020年第4期|共8页
  • 作者

    Maruyama Yutaro; Hasegawa Koji;

  • 作者单位

    Kogakuin Univ Grad Sch Engn Tokyo 1638677 Japan;

    Kogakuin Univ Dept Mech Engn Tokyo 1638677 Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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