Contact phenomena during high velocity collisions of nanoparticles with surfaces

纳米粒子与表面高速碰撞期间的接触现象

• 批准号: 169496886
• 负责人: Professor Dr. Thorsten Pöschel
• 金额: --
• 依托单位: Lehrstuhl für Multiscale Simulation of Particulate Systems (MSS)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/169496886?language=en
• 关键词: Contact; phenomena; during; velocity; collisions

Collisions between gasborne nanoparticles and walls play an important role in many mechanical processes such as dry powder dispersion, particle separation and particle characterization. At technically relevant concentrations, nanoparticles occur in agglomerated state. Adhesion, fragmentation and rebouncing behavior of such agglomerates after wall collisions are not well understood by now. Therefore, primary particle-wall interactions as well as restructuring and fragmentation during agglomerate impaction as functions of agglomerate structure and impact angle and velocity have been studied experimentally and by means of simulations in the first two periods of this project. The relationship between agglomerate properties, intensity of stress and angle and resulting fragmentation patterns was shown. Based on these results, more general dependencies and equations for the description of the dynamics of nanoparticle wall collisions and for the fragmentation probability as well as size distribution of the fragments as functions of impact velocity and interparticle forces are aimed at in the third period.

气载纳米颗粒与壁面之间的碰撞在诸如干粉分散、颗粒分离和颗粒表征等许多机械过程中起着重要作用。在技术上相关的浓度下，纳米颗粒以聚集状态出现。这种附聚物在壁面碰撞后的粘附、破碎和回弹行为目前还没有很好的了解。因此，在本项目的前两个阶段，已经通过实验和模拟研究了作为团聚体结构和冲击角度和速度的函数的团聚体冲击期间的主要颗粒-壁相互作用以及重组和破碎。结果表明，团聚体性质、应力强度和角度与破碎模式之间存在着关系。基于这些结果，更一般的依赖关系和方程的描述的动力学的纳米颗粒壁碰撞和破碎的概率以及作为函数的冲击速度和颗粒间的力量的碎片的大小分布的目的是在第三个时期。