Dr. Arthur Chan's video materials

Continuum of Fluid in Aerosol Physics
• Visualize the difference between continuum and non-continuum regimes
• Explain the significance of continuum of surrounding fluid on particle motion
• Determine continuum regimes using the Knudsen number

Equation of Motion for a Particle
• Name the forces that act on a typical particle
• Formulate the equation of motion using force balance

Drag Force on a Small Particle: Stokes Law
• Determine when Stokes Law is applicable
• State the two components of drag force under Stokes Law
• Calculate the drag force on a particle using Stokes Law
• Apply the slip correction factor in calculate drag force on a particle
• Calculate the drag force on a particle using Newton’s Law of Resistance
• Determine when Newton’s Law of Resistance is applicable

Gravitational Settling of a Particle
• Solve for velocity profile of a settling particle using equation of motion
• Calculate the terminal velocity of a settling particle
• Calculate the timescale to reach terminal velocity and recognize that this timescale for most particles is very short

Particle Inertia, Stop Distance, and Stokes Number
• Calculate the stop distance of a particle
• Relate the stop distance to properties of particle inertia

Electrostatic Force: Equation of Motion and Electrical Mobility
• Calculate the electrostatic force on a particle
• Solve for velocity profile of a particle in an electric field
• Define the electrical mobility of a particle

Electrostatic Force: Charge Distribution
• Describe the physical conditions that lead to an equilibrium bipolar charge distribution
• Use the Boltzmann charge distribution to calculate particle charge

Dynamic shape factor and equivalent diameters
• State the purpose of calculating equivalent diameters
• Define volume equivalent diameter of a nonspherical particle and calculate it for shapes of known volume
• Define dynamic shape factor for a nonspherical particle

Stokes Diameter, Aerodynamic Diameter
• Define Stokes diameter and relate it to volume equivalent diameter using dynamic shape factor
• Define classical and vacuum aerodynamic diameter

Electrical mobility diameter
• Define electrical mobility diameter

Diffusion of Particles: Fick's Law and Diffusion Coefficient
• Calculate the diffusion coefficient of a particle using Stokes-Einstein Equation
• Explain the dependence of diffusion coefficient on particle size
• Relate the importance of diffusion to other processes by comparing length scales

Population Statistics of Particles, Size Distribution
• Justify the use of size distribution function (i.e. normalizing by bin width) over histogram of particles
• Convert between linearly spaced and logarithmically spaced size distribution functions
• Integrate size distribution to obtain number concentration