Acoustic waves can be used for high-precision evaporation of droplets, allowing for fine control over the droplet diameter. Previous works considered the acoustic field as simply a means for generating relative velocity $u_1$ between a droplet and its surrounding gas, which convects heat and mass from the droplet while oscillating. In the present work, we experimentally examine the effects of an acoustic field fundamental characteristics – pressure and velocity distribution and the phase between them – on a droplet evaporation rate. Our results clearly show that the pressure and phase contribute to the evaporation, with the latter dramatically affecting the process. We propose a generalization to existing models that account only for variations in $u_1,$ and demonstrate how the new model outperforms its counterpart when fitted to the experimental data. Our generalized correlation increases $R^2$ for fitting the experimental data from 0.82 to 0.94, when compared with a standard model that only accounts for relative velocity. The new insight may be utilized for enhancement and fine-tuned control over droplet evaporation via acoustics, to be used over a wide range of applications, including lab-on-a-droplet reactions and vapor transport in thermoacoustic devices.

声波可用于液滴的高精度蒸发，从而可以对液滴直径进行精细控制。以前的工作认为声场只是产生相对速度的一种简单方法${ü}_{\mathrm{1个}}$在液滴及其周围的气体之间形成对流，气体在振荡时将来自液滴的热量和质量对流。在目前的工作中，我们实验性地研究了声场基本特征（压力和速度分布以及它们之间的相位）对液滴蒸发速率的影响。我们的结果清楚地表明，压力和相有助于蒸发，而蒸发会极大地影响过程。我们提出了对现有模型的概括，该模型仅考虑了${ü}_{\mathrm{1个}}，$并展示了新模型在拟合实验数据后的表现如何优于同类模型。我们的广义相关性增加${\mathrm{[R}}^{\mathrm{2个}}$与仅考虑相对速度的标准模型相比，可以将实验数据从0.82拟合到0.94。新的见解可用于通过声学增强和微调对液滴蒸发的控制，从而可在包括液滴实验室反应和热声设备中的蒸汽传输在内的广泛应用中使用。