5. Filtration Fibrous filter High-efficiency glass fiber filter (a) 4150x (b) 800x. - Porosity: 70 to >99%. - Fiber size: <1 to 100 micron. - Cellulose.

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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.

Fibrous filter.

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