In the first stage (stable phase) filtration process of the fiber high efficiency filter, particle trapping is mainly achieved by the following effects:
(1) Screening: The fibers in the fiber filter layer are intricately arranged and form numerous grids. When the particle size is larger than the fiber mesh or the interparticle voids deposited on the fiber, the particles are retained on the fiber layer.
(2) Inertia collision: When the airflow passes through the fiber layer, its flow line changes continuously. When the mass of the particles is large or the velocity is high, due to the inertia, the particles are not able to follow the airflow to bypass the fibers, and thus the flow lines are separated from the flow lines and collide with the fibers to be deposited.
(3) Intercepting effect: When the airflow is close to the fiber, the finer dust particles flow around with the airflow. If the dust particle radius is greater than the distance from the center of the dust particle to the fiber edge, the dust particles will be intercepted due to contact with the fiber.
(4) Diffusion: Under the collision caused by the thermal motion of gas molecules, the fine particles act as irregular Brownian motions like balloon molecules. The smaller the particle size, the more significant this effect is.
(5) Electrostatic action: Generally speaking, both fibers and particles may carry electric charges, and the two follow the principle of homosexual reciprocal and heterosexual attraction. If the particles are opposite to the charge carried by the fibers, the particles will adsorb on the filter; if the particles have the same charge as the fibers, the opposite is true. In addition to consciously charging the fibers or particles, if the surface of the fiber is charged by friction during fiber processing or by the induction of particles, since the charge cannot exist for a long time and the electric field strength is weak, The attraction is small and can even be completely ignored.
(6) Gravity sedimentation: dust particles with large particle size and density, after entering the filter, when the gas velocity is not large, when doing slow motion, it can be settled naturally by gravity. Due to the short time of the gas flow through the fiber high-efficiency filter, for most indoor particles, gravity sedimentation is slow due to its small particle size and slow gravity settling, and it has passed through the fiber layer when it has not settled to the fiber.
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