※ hit - stick
Airborne dust particles, or on-demand airflow inertia-movement, or for non-regular exercise, or by the role of a mobile field force. When the movement of the particles hit the barrier, the particle with the barrier between the surface of the barrier on gravity to make it stick
※ resistance
Fiber to bypass airflow, resulting in minimal resistance. Numerous fibers and is the resistance of the filter resistance. Filter with the air flow resistance increased with the increase, by increasing an area of filter material, can reduce the relative wind speed through the filter to reduce the filter resistance.
※ fiber filter material
Filter material should be able to effectively block both the dust particles, not on the formation of too much air resistance. Non-woven fiber material and special paper meets this requirement. Messy interwoven fibers formed numerous particle barrier, a wide space between fibers to allow smooth passage of air.
※ proliferation of Principles
For random motion of small particles. Rules of movement for non-mathematical treatment for the use of mass transfer in the "diffusion" theory. Where there is a principle that proliferation. The smaller particles, no regular exercise more intense, more opportunities to hit obstacles, so the better the filtration effect
※ Inertia Principle
Large particles in the air in the inertia-movement. Barrier bypass airflow case of the particle due to inertia deviate from the airflow direction and hit the barrier on. The larger particles, the stronger the force of inertia, the greater the likelihood crash barrier, so the better the filtering effect.
※ dynamic performance
The dust was captured additional resistance to the airflow, so the use of filters in the resistance gradually increased. The captured dust to form a new barrier, a result, a slight improvement in filtration efficiency. Most of the dust captured in the filter material gathered on the windward side. Filter area is larger, Tung to accommodate more dust, filters, greater life expectancy.
※ efficiency varies with particle size of the
Filters trap dust quantity and unfiltered amount of dust in the air than the "filtration efficiency." Less than 0.1μm (microns) particles were mainly used for the proliferation of sports, the smaller the particle, the higher the efficiency; greater than 0.5μm particles were mainly used for inertial movement, the larger particles, the higher the efficiency. In between the 0.1μm and 0.5μm, efficiency, there is a minimum.
※ filter scrapped
Dust filter on the more the greater the resistance. When the resistance design does not allow large extent, the life of the filter on an end. Sometimes, too much resistance to make filters to capture dust has been flying, there such a danger, the filter should also scrapped.