On the effects of turbulent fluid motion in the collisional growth of aerosol particles
Abstract
The effect of small scale turbulence on the collisional growth of cloud droplets was investigated. Equations for nonuniform motion of a pair of spherical particles at low Reynolds numbers falling in a viscous turbulent environment were solved. Particle trajectories were then studied to define the collection kernel function of the stochastic growth equation. A model for simulating turbulent velocity was developed and used to analyze particle motion. Then the collisional problem was approached as one in probability space. A general definition of the collection kernel function was developed to represent both the non-turbulent and turbulent cases. Results indicate that small scale cloud turbulences strongly affects the collisional trajectories of particles of radii R(CH76)30 microns. For radii R30 microns small changes occur. However for radii between 10 and 30 microns there are large increases in collision efficiencies. Cloud droplet growth curves indicate the striking effect of turbulence on the growth of small cloud droplets.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- May 1975
- Bibcode:
- 1975PhDT.........9D
- Keywords:
-
- Aerosols;
- Cloud Physics;
- Turbulence Effects;
- Drops (Liquids);
- Equations Of Motion;
- Mathematical Models;
- Monte Carlo Method;
- Particle Collisions;
- Particle Trajectories;
- Stochastic Processes;
- Geophysics