Numerical Investigation of Electrostatic Effect on Indoor Particle Resuspension Due to Human Activity

摘要

A numerical study was carried out for indoor particle resuspension due to human walking. The electrostatic effect on particle detachment and resuspension is included in the analysis using a capacitor theory. The shoe-floor system is treated as a plate capacitor. The electrostatic charges and the electric field strength generated by the tribocharging at shoe-floor contact are estimated by the capacitor theory. The Coulomb force, image force, dielectrophoretic force and polarization force are evaluated in the study. The foot stepping down and up processes are treated as the motion of an effective circular disk toward or away from a stationary surface. The surface roughness, the adhesion, lift and drag forces as well as hydrodynamic moment exerted on the particles are also included in the study. The critical radii and particle resuspension rate under various conditions are estimated.