The Coagulation of Soot Particles with van der Waals Forces

Stephen J. Harris; Ian M. Kennedy

doi:10.1080/00102208808947110

The Coagulation of Soot Particles with van der Waals Forces

Stephen J. Harris, Ian M. Kennedy

Mechanical and Aerospace Engineering

Research output: Contribution to journal › Article › peer-review

80 Scopus citations

Abstract

A detailed calculation of the coagulation kinetics of a soot aerosol has been performed by simulating numerically the coagulation kinetics with the inclusion of van der Waals forces. The van der Waals forces between two soot particles at 1600 K and 1 atmosphere give rise to a collision rate enhancement which varies between a maximum of about 2.4 for 1 nm diameter particles to just over 1 for particles of dissimilar sizes. The total coagulation rate with the estimated enhancement factors was about twice the unenhanced rates; this compares favorably with experiment. Over the duration of the computation the soot aerosol size distribution approaches closely the self-preserving form, whether or not the collisional enhancement factors are included.

Original language	English (US)
Pages (from-to)	443-454
Number of pages	12
Journal	Combustion Science and Technology
Volume	59
Issue number	4-6
DOIs	https://doi.org/10.1080/00102208808947110
State	Published - Jun 1 1988

ASJC Scopus subject areas

Chemical Engineering(all)
Chemistry(all)
Energy Engineering and Power Technology
Fuel Technology
Physics and Astronomy(all)

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N2 - A detailed calculation of the coagulation kinetics of a soot aerosol has been performed by simulating numerically the coagulation kinetics with the inclusion of van der Waals forces. The van der Waals forces between two soot particles at 1600 K and 1 atmosphere give rise to a collision rate enhancement which varies between a maximum of about 2.4 for 1 nm diameter particles to just over 1 for particles of dissimilar sizes. The total coagulation rate with the estimated enhancement factors was about twice the unenhanced rates; this compares favorably with experiment. Over the duration of the computation the soot aerosol size distribution approaches closely the self-preserving form, whether or not the collisional enhancement factors are included.

AB - A detailed calculation of the coagulation kinetics of a soot aerosol has been performed by simulating numerically the coagulation kinetics with the inclusion of van der Waals forces. The van der Waals forces between two soot particles at 1600 K and 1 atmosphere give rise to a collision rate enhancement which varies between a maximum of about 2.4 for 1 nm diameter particles to just over 1 for particles of dissimilar sizes. The total coagulation rate with the estimated enhancement factors was about twice the unenhanced rates; this compares favorably with experiment. Over the duration of the computation the soot aerosol size distribution approaches closely the self-preserving form, whether or not the collisional enhancement factors are included.

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The Coagulation of Soot Particles with van der Waals Forces

Abstract

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