Premium
Modeling of particle evolution in aerosol reactors with coflowing gaseous reactants
Author(s) -
Bensberg Andreas,
Roth Paul,
Brink Reinhard,
Lange Helmut
Publication year - 1999
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690451008
Subject(s) - aerosol , particle (ecology) , chemistry , dispersity , mechanics , radius , particle size , nucleation , diffusion , boundary layer , critical radius , thermodynamics , physics , spheres , oceanography , computer security , organic chemistry , computer science , geology , astronomy
A simple model is presented for simultaneous nucleation and coagulation in combination with convective and diffusive particle transport in gas‐phase aerosol reactors over the entire particle‐size spectrum. This model is applied to a spatially inhomogeneous aerosol reactor. The flow and reaction characteristics correspond to a confined coflow diffusion flame of SiCl 4 and NH 3 in a wall‐heated flow. The reactor geometry and the initial and boundary conditions suggest the application of the boundary layer approximations. The reaction process is described by the flame‐sheet model. The particle‐size spectrum is approximated by a unimodal lognormal function. The characteristics of the SiN 4 aerosol (concentration, polydispersity, and average particle size) calculated at every point in the reactor vary significantly in space. At the position of the reaction zone in the outlet cross section, for example, the average particle radius is small (r g ≈1 nm) and the standard deviation is large (σ > 2). At other radial positions the particles are much larger (r g ≈15 nm) and the size distribution is almost self‐preserving (σ≈1.36).