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Design, Numerical Flow Simulation and Construction Feasibility Study of Light Scattering Aerosol Spectrometer

Amir Farzad, Forughi | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43966 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saidi, Mohammad Said
  7. Abstract:
  8. Aerosols are significant two-phase systems that have an important effect on environmental, biological, health, industrial and other scientific and engineering fields. According to chief aerosol effects, various instruments namely “Aerosol Spectrometer” have been developed to measure aerosols. Optical Particle Counters (OPCs) are one of this instruments that can count and measure the particles size distribution in the aerosols.
    In the current project, an optical particle counter has been designed. For validating the correct operation of the designed plan, it is needed to simulate the instrument optically and mechanically, so the Mie theory was used to simulate the intensity of the scattered light by particles. The optical parts of the instrument were designed using geometrical optic principals. To survey the flow and particles path in the instrument, fluid flow was simulated by ANSYS Fluent and particles were tracked by means of a particle tracking UDF code in Lagrangian approach. Since the difference in particles’ refractive indices can lead to a wrong measured size, a novel method based on measurement of scattered light in different angular intervals is presented. This new method is checked by Mie theory simulation and its successful performance was investigated. The scattered light by particles was studied experimentally. This study showed that there is a good agreement between Mie theory and experimental study results
  9. Keywords:
  10. Aerosol Spectrometer ; Mie Scattering Theory ; Particles Simulation ; Multi-Angular Scattering

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