Simulation of the adhesion-moments caused by van der Waals-interactions between rough particles and smooth walls in gaseous environment

模拟气体环境中粗糙颗粒与光滑壁之间的范德华相互作用引起的粘附力矩

• 批准号: 169466609
• 负责人: Professor Dr.-Ing. Eberhard Schmidt
• 金额: --
• 依托单位: Institut für Partikeltechnologie (IPT)
• 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/169466609?language=en
• 关键词: Simulation; adhesion; moments; caused; van

Particle-particle and particle-wall contacts are crucial for the movement behaviour of particle-collectives. Particularly at non spherical objects with flattening or roughnesses there is insufficient information of scale (position) and broadness of the allocation (scattering) of the expected interactions concerning sliding, rotating and overturning of the contact-partners. For the first two years of work on this sub-project one tried to achieve the following two main goals: Development of models for sliding, rotating and overturning of the smooth sphere with flattening and the rough sphere with two point contact facing a smooth wall in gaseous environment. Creation of a simulation for the calculation of complete distribution functions of the adhesion moments of the contact-partners. Common ground of both goals is the description of resistance against external loads caused by shear, torsion and bending forces. In the last two years the particle-building-routine was improved to fit real conditions better. The dependency of the adhesion force built up by an atom and its wall distance has been examined. Further there have been implemented different atomic lattices and a material porosity into the simulation. The calculated data according to adhesion-force and -moment have been compared to the experimental results of other PiKo sub-projects. The anisotropic behaviour of the adhesion-moment for the rough particle was examined. In the next two years the surface of the simulated particle should be influenced further. A bigger number of roughnesses with different geometry should be placed on the surface and their influence on both the adhesion-force and the -moment should be investigated. The measurement of the adhesion-moment is not possible and by now not planned within the SPP PiKo. Therefore the existing ESEM (Environmental Scanning Electron Microscope) of the Department should be upgraded with a micromanipulator and a spring table. With this equipment it would be possible to measure the adhesion-moment and the sliding-resistance force of particles. The fundamental basis of the simulation is still the calculation of the discrete interactions between the involved atoms or molecules of the contact partners and the superpositioning of those to a total interaction.

颗粒粒子和颗粒壁接触对于粒子填料的运动行为至关重要。尤其是在具有扁平或粗糙度的非球形物体中，关于滑动，旋转和推翻接触式的相互作用的规模信息（位置）和分配（散射）的广泛信息不足。在此子项目上的头两年中，一个人试图实现以下两个主要目标：开发用于平滑球的滑动，旋转和倒流的模型，并通过扁平和粗糙的球体在气态环境中面对光滑的墙壁，而粗糙的球体和粗糙的球体则面对光滑的球体。创建一个模拟，以计算接触伙伴的粘附力矩的完整分布功能。这两个目标的共同基础是描述抗剪切，扭转和弯曲力引起的外部载荷的抵抗。在过去的两年中，改进了粒子构建规范，以更好地拟合实际条件。已经检查了由原子及其壁距离建立的粘附力的依赖性。此外，已经实施了不同的原子晶格和模拟中的材料孔隙率。根据粘附力和 - 杂音的计算数据已与其他皮科亚项目的实验结果进行了比较。检查了对粗糙粒子的粘附力的各向异性行为。在接下来的两年中，模拟粒子的表面应进一步影响。应将更大的具有不同几何形状的粗糙度放在表面上，并应研究它们对粘附力和 - 典当的影响。无法在SPP Piko中进行粘附力的测量，并且现在还没有计划。因此，应使用微型手持和弹簧表升级该部门的现有ESEM（环境扫描电子显微镜）。使用该设备，可以测量颗粒的粘附力和滑动抗性力。模拟的基本基础仍然是计算所涉及的原子或接触伙伴分子之间的离散相互作用以及将这些相互作用的叠加到总相互作用中。