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Article
Particle Impact Theory Including Surface Asperity Deformation and Recovery
Journal of Aerosol Science
  • Zhaohui (George) Qin, Cedarville University
  • Richard H. Pletcher
Document Type
Article
Publication Date
12-1-2011
Abstract

A new particle impact theory was proposed, which incorporated plastic deformation and elastic recovery of surface asperities into the overall energy balance of the impact process. Asperity heights were assumed to follow a truncated Gaussian distribution. The energy transfer associated with the deformation and recovery of asperities was derived based on the previous theoretical treatments of thermal contact resistance. It was found that even nanometer level roughness had significant effects on the rebound of micron size particles. The energy loss thus caused could explain the mysterious strong power–law dependence on particle size of critical velocity. Measurements of Wall et al. were compared with the theory. Good agreement had been reached between the theory and experiments for both coefficients of restitution and particle size dependence of critical velocity.

Keywords
  • Particle-surface impact process,
  • Critical velocity,
  • Surface asperities,
  • Plastic deformation,
  • Model
Citation Information
Zhaohui Qin, & Richard Pletcher, (2011). Particle impact theory including surface asperity deformation and recovery. Journal of Aerosol Science, 42(1), 852–858.