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ENV 6130 Aerosol Mechanics

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

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  1. 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

  2. Q: Is this an aerosol?(a) a book, (b) an O2 molecule Definition: More examples ….. Aerosol & Particulate Research Lab

  3. 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

  4. 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

  5. Manufacture: • Pigment • Cosmetics • Optical Fiber • Magnetic powder • Pharmaceutical • Solid lubricant • Tires • Dispersant Aerosol & Particulate Research Lab

  6. 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

  7. Atmosphere: • Cloud, snow, rain, mist • Volcano: St. Helen, Pinotube • Extinction of dinosaurs • Venus, Sunset • Stratospheric Ozone depletion Moon Earth Venus Aerosol & Particulate Research Lab

  8. 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

  9. 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

  10. Aerosol & Particulate Research Lab

  11. Reflection Aerosol & Particulate Research Lab

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