Filtration - FILTRATION Reading Chap 9 Removing...

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Aerosol & Particulate Research Laboratory 1 4/8/10 FILTRATION Reading: Chap 9 Fiber filter Porous membran e Capillary pore membran e filter Granula r bed filter Q: Does a filter work like a microscopic sieve? Removing particulates from an air stream Trapping aerosol in its pathway through tracheal media
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Aerosol & Particulate Research Laboratory 2 4/8/10 Fibrous Filter Cylindrical shape fibers Most perpendicular to the direction of air flow Fiber size: submicron to 100 um Material: cellulose, glass, plastic Porosity: 70% to > 99% Velocity: low ~ 10 cm/s, laminar Glassfiber filter TiO2 Nanofiber
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Aerosol & Particulate Research Laboratory 3 4/8/10 Porous Membrane Filter Irregular path through complex pore structure Porosity: 50% - 90% High efficiency & high pressure drop Material: cellulose ester, sintered metals, PVC, Teflon Cellulose ester porous membrane filter Silver porous membrane filter http://www.2spi.com/catalog/spec_prep/images/silver.g
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Aerosol & Particulate Research Laboratory 4 4/8/10 Capillary Pore Membrane Filter An array of microscopic cylindrical holes of uniform diameter Pores are perpendicular to the surface of the filter The straight path results in lower efficiency compared to other types of filter The smooth surface is particularly useful for collecting particles for observation in microscope Nuclepore capillary pore membrane filter http://www.2spi.com/catalog/spec_prep/images/pg82_1.gi Anopore® inorganic pore membrane filter
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Aerosol & Particulate Research Laboratory 5 4/8/10 Granular Bed Filter A bed of fine granules Good for corrosive aerosols and at high temperature Good for both air and aerosol Materials: activated charcoal, glass, quartz, metal beads Aerosols are removed by washing, volatilization or using solvents
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This note was uploaded on 09/11/2011 for the course ENV 6130 taught by Professor Wu during the Spring '08 term at University of Florida.

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Filtration - FILTRATION Reading Chap 9 Removing...

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