Diffusion - Brownian Motion & Diffusion Reading: Chap7...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
4/8/10 1 Aerosol & Particulate Research Reading: Chap7 http://galileo.phys.virginia.edu/classes/109N/more_stuff/Applets/brownian/brownian.html HISTORY In 1827, English botanist Robert Brown noticed that pollen grains suspended in water jiggled about under the lens of the microscope, following a zigzag path. Even more remarkable was the fact that pollen grains that had been stored for a century moved in the same way. Magic? Q: Observation? http://www.michaelorgan.org.au/robertbrown.j pg
Background image of page 1

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

View Full DocumentRight Arrow Icon
4/8/10 2 Aerosol & Particulate Research Definition: Brownian motion : irregular wiggling motion of a particle caused by random bombardment of gas molecules against the particle Diffusion : the net transport of particles from a region of higher concentration to a region of lower concentration The primary transport mechanism for small particles (< 0.1 μ m); Important when transport distance is small: e.g. filter, airway in human lung, loss in sampling path
Background image of page 2
4/8/10 3 Aerosol & Particulate Research Fick’s First Law of Diffusion The net flux of aerosols (the net number of particle traveling through a unit area per unit time) is proportional to the concentration gradient Obj10
Background image of page 3

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

View Full DocumentRight Arrow Icon
4/8/10 4 Aerosol & Particulate Research Fick’s Second Law of Diffusion + + = = 2 2 2 2 2 2 2 z n y n x n D n D t n A B C D A’ B’ D’ C’ Obj102
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/11/2011 for the course ENV 6130 taught by Professor Wu during the Spring '08 term at University of Florida.

Page1 / 20

Diffusion - Brownian Motion &amp; Diffusion Reading: Chap7...

This preview shows document pages 1 - 5. Sign up to view the full document.

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