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Filtration Based on Electrostatic Devices

Rahimi, Neda | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 46159 (58)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Saidi, Mohammad Said; Sani, Mahdi
  7. Abstract:
  8. Particulate air pollution is one of the top environmental health risks. Industrial processes like power generation from fossil fuels and steel and cement manufacturing release a huge amount of particles into the atmosphere. Moreover, internal combustion engines produce a considerable amount of particulate matter in populated areas. The usual way to overcome this risk is using air-cleaning devices such as filters. Filters are designed for specific purposes like removing aerosol particles, aerosol sampling and collecting valuable particles. Because of its diverse applications, filtration has become an active area of research and many kinds of filters are currently available. One type of filters, called electrostatic filter, separates particles on the basis of electrostatic precipitation. This type of filter is widely used in respiratory protection and clean rooms. In these filters particles are charged and forced to pass over collectors of opposite charges. This causes the particles to accelerate towards the collector walls. Particles hitting the walls are trapped and removed from the flow. The main purpose of this study is to investigate flow hydrodynamics, charging physics, electric field details, and particle transport in wire-plate type of electrostatic filters using a CFD/Multi-physics code (Fluent equipped with UDFs). The major outcome of the simulation is internal flow and electric field details and collection efficiency for three applied voltages 6.5 kV, 7.5 kV and 10.25 kV. During this study some UDFs are written and are compiled to Fluent. Simulation results are validated with available experimental data and they show good agreement within 2.5% difference. By comparing simulation results with experimental ones, it is concludedthat these UDFs are working fine
  9. Keywords:
  10. Particle Capture Efficiency ; Electrostatic ; Filters ; Particles ; Computational Fluid Dynamics (CFD) ; Charged Particles

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