中国物理B ›› 2008, Vol. 17 ›› Issue (12): 4547-4553.doi: 10.1088/1674-1056/17/12/036

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The collision efficiency of spherical dioctyl phthalate aerosol particles in the Brownian coagulation

冯宇1, 林建忠2   

  1. (1)Department of Mechanics, Zhejiang University, Hangzhou 310027, China; (2)Department of Mechanics, Zhejiang University, Hangzhou 310027, China;China Jiliang University, Hangzhou 310018, China
  • 收稿日期:2007-10-04 修回日期:2008-06-21 出版日期:2008-12-20 发布日期:2008-12-20
  • 基金资助:
    Project supported by the State Key Program of the National Natural Science Foundation of China (Grant No 10632070).

The collision efficiency of spherical dioctyl phthalate aerosol particles in the Brownian coagulation

Feng Yu (冯宇)a, Lin Jian-Zhong (林建忠)ab   

  1. a Department of Mechanics, Zhejiang University, Hangzhou 310027, China; b China Jiliang University, Hangzhou 310018, China
  • Received:2007-10-04 Revised:2008-06-21 Online:2008-12-20 Published:2008-12-20
  • Supported by:
    Project supported by the State Key Program of the National Natural Science Foundation of China (Grant No 10632070).

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摘要： 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.

关键词: aerosol particle, Brownian coagulation, collision efficiency, Van Der Waals force

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.

Key words: aerosol particle, Brownian coagulation, collision efficiency, Van Der Waals force

中图分类号:  (Aerosols and foams)

  • 82.70.Rr
61.20.Ja (Computer simulation of liquid structure) 62.10.+s (Mechanical properties of liquids)