Numerical and experimental studies of collection efficiency of an ion electrostatic collector for a mini-volume electrical PM detector |
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| Institution: | 1. Research Unit of Electrostatic Applications in Energy and Environment, College of Integrated Science and Technology, Rajamangala University of Technology Lanna, Chiang Mai 50220, Thailand;2. Center of Excellence in Electromagnetic Energy Utilization in Engineering, Department of Mechanical Engineering, Faculty of Engineering, Thammasat University, Pathum Thani 12121, Thailand;1. Departament d’Enginyeria Electrònica, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain;2. Institut de Microelectrònica de Barcelona, IMB-CNM (CSIC), Campus UAB, Cerdanyola del Vallès, Spain;1. Institute of Advanced Materials & Technology, University of Science and Technology Beijing, Beijing 100083, China;2. Institute of Applied Chemistry, Xinjiang University, Urumqi 830046, China;3. Department of Mechanical Engineering, University of South Florida, Tampa FL 33620, USA;1. Institute of Nuclear Physics and Chemistry, Chinese Academy of Engineering Physics, Mianyang 621900, China;2. Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China;1. Biosystems Engineering & Soil Science Department, University of Tennessee, Knoxville, TN 37996, United States;2. Oak Ridge National Laboratory, Fuels, Engines and Emissions Research Center, Knoxville, TN 37932, United States;3. Mechanical, Aerospace and Biomedical Engineering, University of Tennessee, Knoxville, TN 37996, United States;4. Center for Renewable Carbon, University of Tennessee, Knoxville, TN 37996, United States |
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| Abstract: | The experimental efficiency was numerically and experimentally studied for collecting negative and positive ions in a coaxial cylindrical electrostatic collector for a mini-volume electrical PM detector. The commercial computational fluid dynamics software package COMSOL Multiphysics? was used to predict the behaviors of the flow and electric fields as well as the particle trajectories in the collecting zone of the ion collector. In the experiment, the ions were generated by a corona-needle ionizer with concentrations greater than 1013 ions/m3, the positively and negatively applied voltages at the inner electrode ranged from 0 to 45 V and the ion flow rates ranged from 1 to 5 L/min. For these ion flow rates, 1–5 L/min, the ion precipitates due to space charge and diffusion effects ranged from 92 to 97 % for positive ions and 91–97 % for negative ions. The total collection efficiency of the collector increased to 100% at collection voltages larger than 5, 20 and 40 V respectively for the ion flow rates of 1, 3 and 5 L/min for both positive and negative ions. Numerical calculation results of the ion trajectory in the collecting zone of the collector; showed good agreement with the experimental results of the total collection efficiency and can be used to support the bettering of designing in order to refine an ion collector after the charger or ionizer in a mini-volume electrical aerosol detector. Finally, this shows that this ion collector was proven to be particularly useful as an electrostatic collector for positive and negative ions after the charger or ionizer in a mini-volume electrical aerosol detector. |
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| Keywords: | Ion Aerosol Electrostatic Collector Collection efficiency |
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