Motion of Fractal-Like Aggregates: Particle Settling Velocity and Thermophoresis

A theoretical approach to calculation of the parameters of fractal-like aggregates based on gas-kinetic results for homogeneous spheres is presented. The essence of the approach consists in the replacement of a real fractal aggregate by a sphere equivalent in mobility and approximation of the aggreg...

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Bibliographic Details
Published in:Atmospheric and oceanic optics 2019-09, Vol.32 (5), p.528-533
Main Authors: Beresnev, S. A., Vasiljeva, M. S., Kochneva, L. B.
Format: Article
Language:English
Subjects:
Aerosols
Aggregates
Approximation
Divergence
Fractals
Hydrosoles
Lasers
Mathematical analysis
Optical Devices
Optics
Optics of Clusters
Particle settling
Photonics
Physics
Physics and Astronomy
Settling rate
Settling velocity
Spheres
Thermal conductivity
Thermophoresis
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Summary:A theoretical approach to calculation of the parameters of fractal-like aggregates based on gas-kinetic results for homogeneous spheres is presented. The essence of the approach consists in the replacement of a real fractal aggregate by a sphere equivalent in mobility and approximation of the aggregate density and thermal conductivity by their effective values. The effectiveness of the approach has been confirmed in comparison with known experimental data. It has two important restrictions: a fractal aggregate should consist of a great number of primary particles (100 and more), and primary particles should be monodisperse. Violation of these conditions leads to considerable divergence between theoretical and experimental results.
ISSN:1024-8560
2070-0393
DOI:10.1134/S102485601905004X