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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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slide1

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

slide3

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

reflection
Reflection

Aerosol & Particulate Research Lab

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