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Session 7 Particle Size Distributions

Session 7 Particle Size Distributions. Determining the Terminal Velocity. Determining the Terminal Velocity. Particle Size Distributions. Characteristics : Wide range in size: 5 orders of magnitude 1 nm – 100 µ m Wide range in shape: particles come in all shapes

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Session 7 Particle Size Distributions

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  1. Session 7Particle Size Distributions Particle Size Distributions

  2. Determining the Terminal Velocity Particle Size Distributions

  3. Determining the Terminal Velocity Particle Size Distributions

  4. Particle Size Distributions • Characteristics: • Wide range in size: 5 orders of magnitude 1 nm – 100 µm • Wide range in shape: particles come in all shapes • Wide range in numbers: 104-6 in nanometers and 100-2 in micrometers • Variable density and aerodynamic properties • Any of the properties, such as number, mass, size, surface area, etc, may have various adverse health effects Particle Size Distributions

  5. Particle Size Distributions Particle Size Distributions

  6. Particle Size Distributions Particle Size Distributions

  7. Particle Size Distributions Particle Size Distributions

  8. Particle Size Distributions Particle Size Distributions

  9. Particle Size Distributions Particle Size Distributions

  10. Mode, Median, and Mean of Aerosol Size • Mode: the diameter of the most frequent size • Median: The diameter for which ½ of the total number of particles are smaller and ½ are larger • Arithmetic Mean: The sum of all particle sizes divided by the total number of particles • In general, Mode < Median < Mean • Geometric Mean: the logarithm of the • arithmetic mean of the logarithmic • of all values or the nth root of • product of the N values Particle Size Distributions

  11. Mode, Median, and Mean of Aerosol Size Geometric Mean: Particle Size Distributions

  12. Moment Averages Particle Size Distributions

  13. Lognormal Distribution Particle Size Distributions

  14. Lognormal Distribution Particle Size Distributions

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