Layer buildup and structure from drying deposited droplets

干燥沉积液滴的层积和结构

• 批准号: 398376893
• 负责人: Professor Dr.-Ing. Evangelos Tsotsas
• 金额: --
• 依托单位: Lehrstuhl für Thermische Verfahrenstechnik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/398376893?language=en
• 关键词: Layer; buildup; structure; drying; deposited

Goal of this project is to experimentally replicate in a droplet-by-droplet manner how layers are successively built from drying droplets that contain solid material. Contour and porosity will be measured incrementally during layer buildup by means of white light interferometry. We will go to the smallest droplet size that can be produced and gently deposited by micropipette technology. The investigation will embrace very different fluids (salt solutions, nanosuspensions, microsuspensions) for drying conditions up to technical processing conditions. In this way new insights are expected about the evolution of the structure of porous layers produced by simultaneous spraying and drying, and indirectly also about many end-use properties that depend on coating structure. Mechanisms with an influence on structure formation and their interactions will be identified and analyzed, aiming at regime maps and first correlations of at least partial validity. Finally, experiments designed for same drying conditions will enable a comparison of the ex-situ layer formation measurements with coating in spray fluidized beds.

这个项目的目标是以一滴一滴的方式实验性地复制层是如何从含有固体材料的干燥液滴中连续构建的。在分层过程中，将通过白色光干涉法逐步测量轮廓和孔隙度。我们将使用微量移液器技术来实现最小的液滴尺寸。该研究将包括非常不同的流体（盐溶液，纳米悬浮液，微悬浮液），用于干燥条件和技术加工条件。通过这种方式，预计新的见解有关的多孔层的结构的演变，同时喷涂和干燥，并间接也对许多最终用途的性能，取决于涂层结构。机制与结构形成的影响和它们之间的相互作用将被确定和分析，旨在政权地图和第一相关性至少部分有效性。最后，针对相同干燥条件设计的实验将能够比较非原位层形成测量与喷雾流化床中的涂层。

项目成果

Coating layer formation from deposited droplets: A comparison of nanofluid, microfluid and solution

• DOI: 10.1016/j.powtec.2022.117202
• 发表时间: 2022-02
• 期刊: Powder Technology
• 影响因子: 5.2
• 作者: M. Janocha;E. Tsotsas

In silico investigation of the evaporation flux distribution along sessile droplet surfaces during convective drying

• DOI: 10.1016/j.ces.2021.116590
• 发表时间: 2021-03
• 期刊: Chemical Engineering Science
• 影响因子: 4.7
• 作者: M. Janocha;E. Tsotsas

In‐depth investigation of incremental layer build‐up from dried deposited droplets

• DOI: 10.1002/aic.17445
• 发表时间: 2021-09
• 期刊: AIChE Journal
• 影响因子: 3.7
• 作者: M. Janocha;E. Tsotsas