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Aerosol Particle Charging and Neutralizing

Shaygani, Afshin | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 44929 (58)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Saeedi, Mohammad Saeed; Sani, Mehdi
  7. Abstract:
  8. Knowledge of the properties of aerosols is of great importance in aerosol science. To gain a better understanding of particle properties, behaviors and dynamics, measurement capabilities are crucial and inevitable. The most critical steps in the aerosol size measurements based on electrical techniques are the processes of particle charging and neutralizing. Corona discharge is a paramount method among all aerosol charging methods because of highest concentration of produced ions, which is essential for the efficient particle charging, based on diffusion and field charging mechanisms. The only known method, which could be applied to provide required conditions for these two charging mechanisms, is corona discharge. These charged aerosol particles acquire different mobilities related to their charges under the influence of an electrical field, and could be classified according to their electrical mobilities for later estimations of size distribution of the particles. In this work we are going to review and report all the information needed for prediction and measurement of aerosol size distributions, from simulation of the corona discharge for neutralizing or charging particles, to survey the charging mechanisms and required optimization procedures. Particle tracking and 2D axisymmetric corona simulations were carried out using a computational fluid dynamics code which could be either a commercially available one or the in-house arbitrary polyhedral grid co-located incompressible finite volume solver, called RAYAN code
  9. Keywords:
  10. Aerosol Charging ; Aerosol Neutralizing ; Diffusion Charging ; Corna Disharge ; Electrical Mobility ; Field Charging

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