发表机构
Graduate School of Engineering, Kogakuin University; Department of Mechanical Engineering, Kogakuin University（工学士院; 工学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过背光和BOS方法实验探究声悬浮液珠的蒸发动力学，发现中等湿度下蒸发类似纯水，高/低湿度下受颗粒层影响显著，且液珠随时间扁平化，为无污染微流控设计提供新见解。
AI 中文摘要
液珠（LMs）是由疏水颗粒包裹的液滴，可实现非润湿操作和无容器处理，使其非常适合用于微反应器等应用。当与声悬浮集成时，液珠可作为无接触反应平台。然而，与声场相关的复杂行为，包括变形、内部流动和蒸发，仍未被充分理解。本研究探讨了声悬浮液珠的蒸发动力学。通过背光照明和背景导向纹影（BOS）方法，同时实现了液滴形态和周围蒸气浓度场的可视化。在中等相对湿度（RH = 40%）下，液珠的蒸发速率和蒸气分布与纯水滴非常相似，表明在这些条件下颗粒壳层的影响极小。相反，在高湿度和低湿度条件下观察到显著差异，这归因于疏水颗粒层引入的蒸发阻力和界面特性。此外，尽管纯水滴保持准球形，液珠却随时间表现出逐渐扁平化，表明颗粒壳层施加的机械约束。这些发现为声场中液珠的蒸发与变形耦合行为提供了新见解，为设计无污染微流体和微反应器系统提供了参考。
英文摘要
Liquid marbles (LMs), droplets encapsulated by hydrophobic particles, allow for non-wetting manipulation and containerless handling, making them well-suited for applications such as microreactors. When integrated with acoustic levitation, the LMs serve as contact-free reaction platforms. However, the complex behaviours associated with acoustic fields, including deformation, internal flow, and evaporation, remain insufficiently understood. This study investigates the evaporation dynamics of acoustically levitated LMs. Simultaneous visualisation of the droplet morphology and surrounding vapour concentration fields was achieved using backlighting and the Background-oriented Schlieren (BOS) method. At intermediate relative humidity (RH = 40%), the evaporation rates and vapour distributions of LMs closely resembled those of pure water droplets, indicating that the particle shell exerts minimal influence under these conditions. Conversely, significant differences were observed at high- and low-humidity, attributable to the evaporation resistance and interfacial properties introduced by the hydrophobic particle layers. Furthermore, although pure water droplets maintained a quasi-spherical shape, LMs demonstrated progressive flattening over time, suggesting mechanical constraints imposed by the particle shell. These findings provide new insights into the coupled evaporation and deformation behaviours of LMs in acoustic fields, informing the design of contamination-free microfluidic and microreactor systems.
