Abstract The collision efficiency in the Brownian coagulation is investigated. A new mechanical model of collision between two identical spherical particles is proposed, and a set of corresponding collision equations is established. The equations are solved numerically, thereby obtaining the collision efficiency for the monodisperse dioctyl phthalate spherical aerosols with diameters ranging from 100 to 760nm in the presence of van der Waals force and the elastic deformation force. The calculated collision efficiency, in agreement with the experimental data qualitatively, decreases with the increase of particle diameter except a small peak appearing in the particles with a diameter of 510nm. The results show that the interparticle elastic deformation force cannot be neglected in the computation of particle Brownian coagulation. Finally, a set of new expressions relating collision efficiency to particle diameter is established.
Received: 04 October 2007
Revised: 21 June 2008
Accepted manuscript online:
Fund: Project
supported by the State Key Program of the National Natural Science
Foundation of China (Grant No 10632070).
Cite this article:
Feng Yu (冯宇), Lin Jian-Zhong (林建忠) The collision efficiency of spherical dioctyl phthalate aerosol particles in the Brownian coagulation 2008 Chin. Phys. B 17 4547
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