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Investigation of Elementary Processes in a Process-Spray at Non-Newtonian Droplets by means of Direct Numerical Simulations

通过直接数值模拟研究非牛顿液滴过程喷雾中的基本过程

基本信息

批准号：
122265448
负责人：
Professor Dr. Dieter Bothe
金额：
--
依托单位：
Arbeitsbereich Mathematische Modellierung und Analysis (MMA)
依托单位国家：
德国
项目类别：
Priority Programmes
财政年份：
2009
资助国家：
德国
起止时间：
2008-12-31 至 2015-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/122265448?language=en
关键词：
Investigation Elementary Processes Process Spray

项目摘要

The properties of particulate products manufactured by means of spray processes depend on the underlying spray characteristics. The primary atomization as well as droplet collisions inside the spray influence the particle size distribution and thus the quality of the product significantly. Up to now, in the class of non-Newtonian fluids the collision of shear thinning drops have been investigated extensively and first studies have been devoted to the collision of viscoelastic drops. The aim of the present project is to finalize these research works. For this purpose we will consider the collision of Newtonian, viscoelastic and partially dried droplets. In addition to the basic understanding of these elementary processes, data for the mechanistic modeling of these processes can be obtained. The viscous dissipation during the collision of Newtonian drops is investigated, as it is not adequately included by existing models. Once the collision model is developed, it will be expanded to include the influence of viscoelastic rheology. The stability against collisions is relevant for partially dried drops. The findings, obtained by Direct Numerical Simulations, will be incorporated into the mechanistic modeling. The transfer to simulations with a reduced level of detail, such as Euler-Euler and Euler-Lagrange simulations, allow for a better prediction of the overall process and product properties.

通过喷涂工艺制造的颗粒产品的性能取决于潜在的喷涂特性。主雾化以及喷雾内的液滴碰撞影响颗粒尺寸分布，从而显著影响产品质量。到目前为止，在非牛顿流体中，剪切稀化液滴的碰撞已经得到了广泛的研究，并且首先研究了粘弹性液滴的碰撞。本项目的目的是完成这些研究工作。为此目的，我们将考虑牛顿，粘弹性和部分干燥液滴的碰撞。除了对这些基本过程的基本理解之外，还可以获得这些过程的机械建模数据。牛顿液滴碰撞过程中的粘性耗散进行了研究，因为它是没有充分包括现有的模型。一旦碰撞模型被开发，它将被扩展到包括粘弹性流变学的影响。抗碰撞的稳定性与部分干燥的液滴相关。通过直接数值模拟获得的研究结果将被纳入机制建模。转移到具有降低的细节水平的模拟，例如欧拉-欧拉和欧拉-拉格朗日模拟，允许更好地预测整个过程和产品特性。