Numerical modeling of Van der Waals interaction between a spherical particle and rough surfaces with different planar asperity distributions

作者：Zhang, Ji; Zhu, Yingmin^*; Ragab, Tarek; Wang, Weidong^*; Zhang, Haiyan; Wang, Xiao; Jiang, Kyle

来源：Powder Technology, 2023, 428: 118877.

DOI：10.1016/j.powtec.2023.118877

• Microstructures
• Rough surface
• Van der Waals force
• Particle adhesion
• Asperities
• Particle contact

Roughness and microstructures at the micro and the nano scales have significant influence on the van der Waals forces between the adhering particles and the surface. Previous theoretical models may treat the particle-asperity interactions in an unprecise manner, which may result in inaccurate estimations of the van der Waals force especially when the sphere is much larger than the asperities. In this paper, we proposed a numerical model to calculate the van der Waals force between a spherical particle and a rough surface with periodic nanostructures. The 3D sinusoidal rough surfaces are simplified with their asperities modelled as hemispheres, and the contact is within the Derjaguin-Muller-Toporov (DMT) regime. The proposed model calculates the van der Waals forces between the sphere and all the asperities in the contact surface, which will provide more accurate estimations of the van der Waals force. Moreover, the effect of the planar distribution of asperities on the van der Waals forces is considered, which includes the cases when asperities have close-packed hexagonal lattice, square, and hollowcentered hexagonal packing distributions. The theoretical results calculated using the proposed model are

• 单位
  西安电子科技大学