The investigation and modeling of the evaporation rates and particle formation for spray drying processes is usually performed on the scale of single droplet drying experiments. Especially the solidification processes of suspension drops and the resulting evaporation rates in the second drying stages are not yet fully understood. In an extensive parameter study, the drying mechanisms in an insulated acoustic levitator are evaluated at varying gas temperatures, relative humidities and drop compositions. Based on design of experiments, a methodical approach for the empirical model development of the drying rates in the first and second drying stages is presented. It is shown, that the drop deformation has to be considered when modeling the evaporation. A qualitative analysis of the resulting particle morphologies is given and a dynamic model for the complete single droplet drying experiment is presented.

喷雾干燥过程的蒸发速率和颗粒形成的研究和建模通常在单滴干燥实验的规模上进行。特别是悬浮液滴的固化过程以及在第二干燥阶段中产生的蒸发速率尚未完全被理解。在广泛的参数研究中，在变化的气体温度，相对湿度和液滴成分下评估了绝缘声悬浮器的干燥机理。基于实验设计，提出了一种在第一和第二干燥阶段干燥速率经验模型开发的方法方法。结果表明，在对蒸发进行建模时必须考虑液滴变形。