This study presents a new approach to investigate the drying behavior and the structure of deposit resulting from drying of solid containing micro droplets. It is shown that deposit structure (porosity and “footprint”) depends on drying conditions. This dependency may contribute to better understanding of particle‐forming processes, such as fluidized bed coating. In the framework of this study, sessile droplets containing sodium benzoate dissolved in water were dried on thin glass plates in a small drying chamber. The drying conditions (temperature, moisture content and flow rate of drying gas) and material parameters (solid content of solution) were systematically varied. The drying rate of droplets was determined from the moisture balance of the drying gas. The final three‐dimensional shape of dried sessile droplets was measured using white‐light interferometry and transformed into a two‐dimensional profile using a Monte Carlo method. Moreover the mean porosity of dried droplets was calculated. By comparison of structural information and process conditions it is shown that the drying process may have a large influence on deposit structure. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2002–2016, 2018

中文翻译：

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用白光干涉法对无柄干燥液滴中盐沉积物形态的实验研究

这项研究提出了一种新的方法来研究干燥行为和干燥含有固体微滴的固体沉积物的结构。结果表明，沉积物的结构（孔隙度和“足迹”）取决于干燥条件。这种依赖性可能有助于更好地理解颗粒形成过程，例如流化床涂层。在这项研究的框架中，将含有溶于水中的苯甲酸钠的无蒂液滴在一个小的干燥室中的薄玻璃板上干燥。系统地改变了干燥条件（温度，水分含量和干燥气体的流速）和材料参数（溶液的固体含量）。从干燥气体的水分平衡确定液滴的干燥速率。干燥的无柄小滴的最终三维形状是使用白光干涉法测量的，并使用蒙特卡洛方法转换为二维轮廓。此外，计算了干燥液滴的平均孔隙率。通过比较结构信息和工艺条件，可以看出干燥过程可能会对沉积物结构产生很大影响。©2018美国化学工程师学会AIChE J，64：2002–2016，2018