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Aggregate size distribution evolution for Brownian coagulation-sensitivity to an improved rate constant.
1Chemical Engineering Department, Yale University, New Haven, CT 06520-8286, USA.
Journal of Colloid and Interface Science
|May 18, 2004
Summary
Brownian motion drives aerosol aggregate growth. Updated coagulation models reveal changes in aggregate size distribution, impacting light scattering and particle behavior.
Area of Science:
- Aerosol science
- Physical chemistry
- Computational fluid dynamics
Background:
- Aerosol aggregates grow via Brownian motion and collisions in gaseous environments.
- Sintering (coalescence) is often slower than aggregate formation.
- Aggregate populations are polydisperse, requiring advanced modeling.
Purpose of the Study:
- To investigate the impact of improved coagulation frequency laws on fractal-like aggregate populations.
- To analyze changes in the asymptotic aggregate size distribution.
- To assess the implications for light-scattering and inertial impaction.
Main Methods:
- Utilized the quadrature method of moments (MOM).
- Employed Monte Carlo simulations for aggregate growth.
- Focused on fractal-like aggregates characterized by volume or number of spherules.
Main Results:
- Recent advancements in free molecule regime coagulation frequency laws were incorporated.
- Systematic changes in the asymptotic aggregate size distribution were observed.
- These changes significantly affect light-scattering properties and inertial impaction behavior.
Conclusions:
- Improved coagulation models alter the predicted aerosol aggregate size distribution.
- Accurate modeling of coagulation is crucial for understanding aerosol behavior.
- Findings have implications for aerosol characterization and applications involving light scattering and particle transport.