ENV 6130 Aerosol Mechanics
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ENV 6130 Aerosol Mechanics. Reading: Chap. 1. http://aerosols.wustl.edu/Education/AerosolBasics/What%20is%20an%20aerosol.htm. What is an aerosol?. http://helios.bto.ed.ac.uk/bto/microbes/airborne.htm. Q: Is this an aerosol? (a) a book, (b) an O 2 molecule. Definition :. More examples ….

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ENV 6130 Aerosol Mechanics

Reading: Chap. 1

http://aerosols.wustl.edu/Education/AerosolBasics/What%20is%20an%20aerosol.htm

What is an aerosol?

http://helios.bto.ed.ac.uk/bto/microbes/airborne.htm

Aerosol & Particulate Research Lab


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Q: Is this an aerosol?(a) a book, (b) an O2 molecule

Definition:

More examples …..

Aerosol & Particulate Research Lab


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Traffic jam in Bangkok

Wheatfield under clouds (Van Gogh)

Uncontrolled stack emissions

Powder prepared by aerosol processes

Q: Where do aerosols come from (i.e. sources)?

Aerosol & Particulate Research Lab


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Why do we want to study aerosols?

  • Air Pollution:

    • Pittsburgh, Mumbai, Shanghai

    • Toxic metals

    • Dioxin formation

    • Visibility

Magnitogorsk, Russia

Soga Industrial Park, Japan

Smog in LA

Aerosol & Particulate Research Lab


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  • Manufacture:

    • Pigment

    • Cosmetics

    • Optical Fiber

    • Magnetic powder

    • Pharmaceutical

    • Solid lubricant

    • Tires

    • Dispersant

Aerosol & Particulate Research Lab


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  • Health:

    • Deposition in inhalation system

    • A portal for drug delivery

    • Work place, papermill, mining, pesticide, welding

    • Disease transmission

Welding

Corona virus

http://news.bbc.co.uk/nol/shared/spl/hi/health/03/travel_health/diseases/img/sars.jpg

Aerosol & Particulate Research Lab


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  • Atmosphere:

    • Cloud, snow, rain, mist

    • Volcano: St. Helen, Pinotube

    • Extinction of dinosaurs

    • Venus, Sunset

    • Stratospheric Ozone depletion

Moon

Earth

Venus

Aerosol & Particulate Research Lab


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How do we characterize an aerosol?

  • Microscopy

    • Optical, Electronic

    • Primary & Agglomerate

  • Velocity

    • Settling velocity

    • Time of flight

  • Chemical analysis

    • XRD, FTIR, PIXE, ICP

dp=1m

dp=2m

p=4g/cm3

p=1g/cm3

V = 1 cm/s

V = 1 cm/s

Aerosol & Particulate Research Lab


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  • Light scattering intensity

  • Units:

    • SI system: m, kg, s (also cgs system: cm, g, s)

    • yardstick: m (=10 -4 cm = 10-6 m);

    • submicron & supermicron

    • ultrafine & nanoparticles

Particle size is the most commonly used one!  Equivalent

diameter

Aerosol & Particulate Research Lab



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Reflection

Aerosol & Particulate Research Lab


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