Deposition velocity is defined as F = v*c, where F is flux density, v is deposition velocity and c is concentration. In gravitational deposition, this velocity is the settling velocity due to the gravity and drag.
Often studied is whether or not a certain particle will impact with a certain obstacle. This can be predicted with the Stokes number Stk = S/d, where S is stopping distance (which depends on particle size, velocity and drag forces), and d is characteristic size (often the diameter of the obstacle). If the value of Stk is less than 1, the particle will not collide with that obstacle. However, if the value of Stk is greater than 1, it will.
Deposition due to Brownian motion obeys both Fick's first and second laws. The resulting deposition flux is defined as J=n*(D/πt)¹/², where J is deposition flux, n is the initial concentration, D is the diffusion constant and t is time. This can be integrated to determine the concentration at each moment of time.
Dry deposition is caused by:
In wet deposition, there are always some atmospheric hydrometeors which scavenge aerosol particles. This means that dry deposition is gravitational coagulation with water droplets. Different types of wet deposition include:
Modeling studies of ammonia dispersion and dry deposition at some hog farms in North Carolina.(TECHNICAL PAPER)(Technical report)
Sep 01, 2008; ABSTRACT A modeling study was conducted on dispersion and dry deposition of ammonia taking one hog farm as a unit. The ammonia...
Characteristics of carbonate building stones that influence the dry deposition of acidic gases.(analysis of carbonate building stones in English and Spanish monuments)(Brief Article)(Technical)
Apr 01, 1999; Abstract The behaviour of several porous carbonate building stones used in Spanish and English monuments was compared. Stones...