REMOVAL OF FINE PARTICLES FROM VARIOUS SU RFACES BY CONSECUTIVE PULSEAIR-JETS - PREDICTION OF PARTICLE REMOVAL EFFICIENCY WITH RESUSPENSION PARAMETER

Consecutive pulse air jets are effective for the removal of fine parti cles from various surfaces. In the present work, the removal efficienc ies of spherical particles from smooth flat surfaces are correlated by introducing three parameters (i. e., the fraction of particles remove d by the first air jet blow, r(1), irremovable fraction of particles, ao, and the parameter related to the fraction of particles removed by each air jet blow, C'), and the dependencies of these parameters on F (the ratio of drag force acting on a particle to van der Waals adhesi on ford) are investigated. As a result, the removal efficiencies from smooth flat surfaces are successfully correlated by these parameters, and all of the parameters are well expressed as a single value functio n of F. By applying these correlation equations to rough surfaces, it is found that another parameter to express the roughness of surface i s necessary in predicting three parameters as a function of F, althou gh the removal efficiencies from rough surfaces are well correlated by the three parameters. Further, it is found that there is a particle s ize with a minimum removal efficiency for a given roughness of surface .