The collision efficiency of spherical dioctyl phthalate aerosol particles in the Brownian coagulation |
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Authors: | Feng Yu and Lin Jian-Zhong |
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Institution: | Department of Mechanics, Zhejiang University,
Hangzhou 310027, China; Department of Mechanics, Zhejiang University,
Hangzhou 310027, China;China Jiliang University, Hangzhou 310018, China |
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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. |
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Keywords: | aerosol particle Brownian coagulation collision efficiency Van Der Waals force |
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