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5. Filtration Fibrous filter High-efficiency glass fiber filter (a) 4150x (b) 800x. - Porosity: 70 to >99%. - Fiber size: <1 to 100 micron. - Cellulose fiber, glass fiber, plastic fiber. - Low velocity: 10 cm/sec. - Need large filter area.
Membra ne filter Cellulose ester porous membrane filter with 0.8-micron pore size (a) 4150x (b) 800x. - Porosity: 50 to 90%. - High efficiency and pressure drop. - Cellulose ester, sintered metals, PVC, Teflon, plastics.
Capillary pore membrane filter with 0.8-micron pore size (a) 4150x (b) 800x.
Collection efficiency Mass efficiency Count efficiency Mass penetration Count penetration Penetration
Face velocity Interstitial velocity is flow rate is cross-sectional area is packing density or solidity Packing density or solidity Usually 0.01< <0.3
Particle penetration Filter quality is fractional capture per unit thickness is thickness is pressure drop
Some aerosol-sampling filter materials.
Single-fiber efficiency Cellulose ester porous membrane filter with 0.8-micron pore size (a) 4150x (b) 800x.
is fiber diameter
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+ Chapter 13: States of Matter Gases Kinetic Molecular Theory—attempts to explain the properties of gases. Assumes: Particles are small and separated.
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