Efficiency of inertial deposition of aerosol particles in fibrous filters with regard to particle rebounds from fibers

Special features of filtration of heavy particles with fine-fiber materials

“…As has been noted in [1,2], under standard filtration con ditions, heavy metal particles with density ρ 1 1 0 g/cm 3 can rebound from fibers, in contrast to light particles with density ρ 1 ~ 1-2 g/cm 3 . This phenome non drastically decreases the filtration performance.…”

“…This phenome non drastically decreases the filtration performance. Works [1,2] dealt with the interaction of a single par ticle with a single fiber, which is valid at an initial stage of filtration through a low density fibrous medium. As a result of particle deposition onto fibers, each subse quent particle interacts with a fiber and particles that have been previously deposited onto it.…”

Influence of Nanoneedles Located on Fibers and Particles on Aerosol Filtration Efficiency

“…It should be noted that the blowing of particles from a surface under the action of a turbulent air jet has recently been studied in detail, and approximately the same results have been obtained [4,5]. In [6,7], the doubts expressed in [8] about the efficient collection of nanoparticles subjected to intense Brownian motion have been excluded. In [6,7], it has been shown that particles are not adhered to a surface, when the Stokes inertia criterion exceeds a critical value, which is not realized in the practice of fine filtration.…”

“…(2) at the contact point, we can determine flow velocity U before the filter, above which a particle that has approached the needle point at the minimum distance will not be deposited onto the fiber: (7) Calculated flow velocities at which particles with < 1 μm can be blown away from the point of a conical needle, are shown in Fig. 3.…”

“…In [6,7], the doubts expressed in [8] about the efficient collection of nanoparticles subjected to intense Brownian motion have been excluded. In [6,7], it has been shown that particles are not adhered to a surface, when the Stokes inertia criterion exceeds a critical value, which is not realized in the practice of fine filtration. The absence of nanoparticle rebound, including that at a high temperature, has recently been confirmed experimentally [9].…”