Dust removal mechanism of filter bag
The first is the screening effect. When the dust particle size is larger than the pores of the filter cloth or the pores between dust particles deposited on the filter cloth, the dust is intercepted. Since the pores of the new filter cloth are much larger than the particle size of the dust, the retention effect is very small. When a large amount of dust is deposited on the surface of the filter cloth, the retention will increase significantly.
The second is the effect of inertial collision. When the dust-laden airflow approaches the filter cloth fiber, the airflow will bypass the fiber, and the dust particles will continue to move forward due to inertia, and they will be captured when they hit the fiber. All large dust particles within the critical line of the dust trajectory can reach the surface of the fiber and be trapped. This inertial collision effect increases with the increase of dust particle size and flow velocity.
The third is static electricity and diffusion. When the air velocity is very low, the dust particles smaller than 1μm are removed mainly by diffusion and static electricity. Dust particles smaller than 1μm break away from the streamline under the impact of gas molecules and perform Brownian motion like gas molecules. If it comes into contact with the fiber during movement, it can be separated from the airflow. This phenomenon is called diffusion.
The last effect is gravity. When the slowly moving dust-laden airflow enters the dust collector, dust particles with a large particle size and density may naturally settle due to gravity.