psd-apcd - 9/13/11 University of Florida Environmental...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 9/13/11 University of Florida Environmental Engineering 9/13/11 University of Florida Environmental Engineering 11 Particle Characteristics Aerosol size Aerosol size distribution Representative size Weighted distribution Log-normal distribution Reading: Chap 3.1- 3.2 Click to edit Master subtitle style 9/13/11 University of Florida Environmental Engineering 9/13/11 University of Florida Environmental Engineering 22 How do we characterize a particle? Size , Shape, Density, Composition (toxicity, corrosivity, reactivity), Phase (liquid, solid) Coal fly ash particles Iron oxide particles from arc welding Why should we care the particle size? How do we determine particle size? Characterizing an Aerosol Particle 9/13/11 University of Florida Environmental Engineering 9/13/11 University of Florida Environmental Engineering 33 dp > 10 m 1 < dp <10 I m dp < 1 m Health Concern : deposition in our respiratory system Control Devices Collection Efficiency : depends on particle size Lifetime of Aerosols in the Atmosphere : particle size Environmental Quality (e.g. visibility) : particle size 9/13/11 University of Florida Environmental Engineering 9/13/11 University of Florida Environmental Engineering 44 (see also Figure 3.1) Size Range of Aerosol Particles Hinds, Aerosol Technology, 1999 9/13/11 University of Florida Environmental Engineering 9/13/11 University of Florida Environmental Engineering 55 How do we characterize particleS? Concentration: Number concentration by counting Mass concentration by weight measurement Size Spread Particle size distribution Ex: Particles in room air: N = 104 #/cm3 M = 5.236 10-6 g/cc dp = 10-3 cm = 10 m Aerosol Size Distribution Q: Does this mean all the 104 particles in the 1 cc air are 10 m? What is the effect if we use this size to represent the system (e.g. in inhalation system)? How can we better describe this aerosol system? 9/13/11...
View Full Document

Page1 / 18

psd-apcd - 9/13/11 University of Florida Environmental...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online