what is the principal of filtration
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filtration in various modes of operation for both solid/gas and solid/liquid suspensions. It provides the necessary knowledge and background information to prepare and equip persons who are interested in serious filtration work. It is a useful reference/text for students and practicing engineers
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PRINCIPLES OF FILTRATION
There are 4 main principles of how mechanical filters remove particles from the air stream. Particles are captured by coming into contact with the fibers of the filter media in the following ways:
DIRECT INTERCEPTION
Filter medias have openings through which air and fluid passes. If the particles in the flow stream are larger than the pores or openings in the filter medium, they will be removed as a result of direct interception by the holes.
INERTIAL IMPACTION
Particles in the air stream have mass and velocity, as the air stream passes through a filter media, the air diverts around the fiber, however because the particles tend to move in a straight line, those particles located at or near the center of the flow line will stick or impact upon the fiber and be removed.
DIFFUSIONAL INTERCEPTION
In this process, particles are on a collision course with flow stream molecules. These frequent collisions cause the suspended particles to move in a random fashion around the fluid flow lines, which increases the likelihood of contacting the fiber surface and being removed
SIEVING
Sieving is a simple technique for separating particles of different sizes. For example when a particle is too large to fit between the media fiber spaces.
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There are 4 main principles of how mechanical filters remove particles from the air stream. Particles are captured by coming into contact with the fibers of the filter media in the following ways:
DIRECT INTERCEPTION
Filter medias have openings through which air and fluid passes. If the particles in the flow stream are larger than the pores or openings in the filter medium, they will be removed as a result of direct interception by the holes.
INERTIAL IMPACTION
Particles in the air stream have mass and velocity, as the air stream passes through a filter media, the air diverts around the fiber, however because the particles tend to move in a straight line, those particles located at or near the center of the flow line will stick or impact upon the fiber and be removed.
DIFFUSIONAL INTERCEPTION
In this process, particles are on a collision course with flow stream molecules. These frequent collisions cause the suspended particles to move in a random fashion around the fluid flow lines, which increases the likelihood of contacting the fiber surface and being removed
SIEVING
Sieving is a simple technique for separating particles of different sizes. For example when a particle is too large to fit between the media fiber spaces.
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