论文标题
袋子中介导的电影雾化在咳嗽机中
Bags mediated film atomization in a cough machine
论文作者
论文摘要
我们将实验和数值计算结合在一起，以检查与剧烈呼吸道操作期间与生物溶质溶液产生相关的基本流体机械过程，例如咳嗽或打喷嚏。在咳嗽机中进行的类似实验 - 由薄薄的液体膜上的强剪切气流组成，使我们能够说明膜拓扑的变化，因为它会分解成小滴。我们确定液体薄膜剪切过程中的气溶胶产生是由膨胀的袋状结构的形成介导的。这些袋子的破裂是由伸出袋表面的缩回孔的外观触发的。因此，从充气袋到液滴的级联反应主要由液体边缘的动力学和稳定性控制这些缩回的孔。我们还揭示了流体粘度的稳定作用，最终导致较小的液滴产生。
We combine experiments and numerical computations to examine underlying fluid mechanical processes associated with bioaerosol generation during violent respiratory manoeuvres, such as coughing or sneezing. Analogous experiments performed in a cough machine -- consisting of a strong shearing airflow over a thin liquid film, allow us to illustrate the changes in film topology as it disintegrates into small droplets. We identify that aerosol generation during the shearing of the liquid film is mediated by the formation of inflated bag-like structures. The breakup of these bags is triggered by the appearance of retracting holes that puncture the bag surface. Consequently, the cascade from inflated bags to droplets is primarily controlled by the dynamics and stability of liquid rims bounding these retracting holes. We also reveal the stabilizing role of fluid viscosity that eventually leads to the generation of smaller droplets.
