Mechanism of droplet-formation in a supersonic microfluidic spray device
Mechanism of droplet-formation in a supersonic microfluidic spray device
复制标题
DOI：
10.1063/1.5145109
复制
发表时间：
2020-04-13
影响因子：
4
通讯作者：
Knowles, T. P. J.
中科院分区：
文献类型：
--
作者：
Kartanas, T.;Toprakcioglu, Z.;Knowles, T. P. J.
喷雾干燥是汽车、食品和制药行业采用的一种方法，作为一种强大且经济高效的液体雾化技术，可以直接控制液滴的尺寸。大多数商用喷嘴是为大流量喷雾干燥应用或均匀表面涂层而设计的，但微流控雾化器最近已被开发为小规模替代产品。在这里，我们探索在微流控喷雾干燥系统中常见的超音速流动条件下定义液滴大小和形成的物理参数。我们使用高速成像和激光散射测量来检查喷嘴的操作，这使我们能够描述喷雾制度和液滴尺寸分布。结果表明，使用该喷嘴装置可以产生直径为4~8微米的液滴。此外，我们还表明，超音速De-Laval喷嘴模型可以用来预测液滴的平均尺寸。我们的方法可以作为将流体微处理与气相检测和表征相结合的平台。
Spray drying is an approach employed in automotive, food, and pharmaceutical industries as a robust and cost efficient liquid atomization technique offering direct control over droplet dimensions. The majority of commercially available spray nozzles are designed for large throughput spray drying applications or uniform surface coating, but microfluidic nebulizers have recently been developed as small scale alternatives. Here, we explore the physical parameters that define the droplet size and formation under supersonic flow conditions commonly found in microfluidic spray drying systems. We examined the spray nozzle operation using high speed imaging and laser scattering measurements, which allowed us to describe the spray regimes and droplet size distributions. It was determined that by using this spray nozzle device, droplets with diameters of 4-8 mu m could be generated. Moreover, we show that the supersonic de Laval nozzle model can be used to predict the average droplet size. Our approach can be used as a platform for interfacing fluid microprocessing with gas phase detection and characterization.