Advanced Air Pollution Control and Engineering

Evaporation/Condensation Kinetics

Derivation of the Kelvin equation, homogeneous nucleation, kinetics of mass transfer between the gas phase and individual particles, and application of the theory in aerosol measurements, specifically the condensation particle counter.

Slides and Lecture Notes

Slide Deck: link

Lecture Notebook: Virtual Volatility Tandem DMA

Reading

Reading: Hinds, Chapter 13.

Homework

⌨ Assignment

  1. What is the growth rate of a 2  μm2\; \mu m droplet of pure water in an environment with 2% supersaturation at T=293  KT = 293\; K? Neglect the Fuchs effect and droplet heating. Answer: 17μm/s17 \mu m/s.

  2. To generate a test aerosol, a suspension of polystyrene spheres in water is aerosolized as 20 μm\mu m droplets and dried to a relative humidity of 60%. How much residence time is required after mixing to ensure complete drying of the droplets at T=293  KT = 293\; K? Answer: 0.98  s0.98\; s.

CC BY-NC 4.0 Markus Petters.