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| Motion Characteristics of Charged Particulate Matter in Diesel Particulate Matter Detection Device |
| DOI：10.13949/j.cnki.nrjgc.2019.03.016 |
| Key Words:charged particulate matter diesel particulate matter detection device motion track motion speed force on particulate matter |
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| Download times: 2015 |
| Abstract:A model coupling gas phase, electric field and particle phase was established to study the motion characteristics of charged particles in a diesel particulate detection device. The model was solved by the COMSOL Multiphysics software, and the motion track and velocity of as well as the force on the charged particles inside the diesel particulate detection device were obtained. The results show that under electric field force, the charged particles move towards the grounding plate and shifted from the original track. As a high voltage is applied to the ionization-charge region, and a square wave voltage to the electrostatic trapping region, the square wave current appears in the measurement region, achieving the conversion of particle concentration. The particle motion is slow and stable near the ionization-charge and electrostatic trap regions, making particles be fully charged in the ionization-charge region, and some particles be trapped in the electrostatic trap region. In the ionization-charged and electrostatic trapping zones, particles are affected by the electric field and the drag forces, and the drag force increases to some extent with the increase of the inlet flow velocity. |
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