Enhancement of filtration efficiency by electrical charges on nebulized particles |
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| Institution: | 1. Environmental Technology Division, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;2. Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Tsinghua University, Beijing 100084, China;1. Dept. of Electrical and Electronic Engineering, Kanagawa Institute of Technology, 1030 Shimo-ogino, Atsugi, Kanagawa 243-0292, Japan;2. Dept. of Applied Bioscience, Kanagawa Institute of Technology, 1030 Shimo-ogino, Atsugi, Kanagawa 243-0292, Japan;3. Dept. of Nutrition and Life Science, Kanagawa Institute of Technology, 1030 Shimo-ogino, Atsugi, Kanagawa 243-0292, Japan;1. Process Engineering, Institute of Materials Science, Badgasteiner Strasse 3, 28359 Bremen, Germany;2. Lydall Gutsche GmbH & Co. KG, Hermann-Muth-Str. 8, 36039 Fulda, Germany;3. Particles and Process Engineering, University of Bremen, Bibliothekstrasse 1, 28359 Bremen, Germany;1. CIEMAT Nuclear Safety Unit, Nuclear Fission Division, Avda. Complutense, 40, 28040 Madrid, Spain;2. Institut de Radioprotection et de Sûreté Nucléaire (IRSN), St Paul lez Durance, France;3. Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA) Via Martiri di Monte Sole, 4, Bologna, Italy;4. Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH Schwertnergasse 1, 50667 Köln, Germany;1. Institute of Atmospheric Sciences and Climate (ISAC)-CNR, Bologna, Italy;2. Department of Physics and Earth Sciences, University of Ferrara, 44122, Ferrara, Italy;3. ECSIN — European Center for the Sustainable Impact of Nanotechnology, Veneto Nanotech Scpa, Rovigo, Italy;4. Regional Agency for Prevention, Environment and Energy of Emilia-Romagna (ARPAE), Bologna, Italy;5. University of Eastern Piedmont “A. Avogadro”, Department of Science and Technology Innovation, Alessandria, Italy |
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| Abstract: | There have been few investigations of effects of electrical charge, carried by lab-generated particles, on filtration efficiency testing. Here, we measured the elementary charge on particles and the fraction of particles carrying that charge with a combined electrometer, differential mobility analyzer, and scanning mobility particle sizer. A typical solid NaCl aerosol and liquid diethylhexyl sebacate (DEHS) aerosol were generated with Collison and Laskin nebulizers, respectively. Our experimental results showed that NaCl aerosols carried more charge after aerosol generation. The average net elementary charge per particle was approximately 0.07. The NaCl aerosol was overall positively charged but contained a mixture of neutral and charged particles. Individual particles could carry at most four elementary charges. According to constant theorem, we speculated that original NaCl aerosol contained 17% neutral, 45% positive-, and 38% negative-charged particles in the diameter range from 30 to 300 nm. A Kr-85 neutralizer was used to decrease the charge on the NaCl particles. Our results indicated that the DEHS aerosol was electrically neutral. The effects of electric charge on particle collection by electret and electroneutral high efficiency particulate air (HEPA) filters were analyzed. Theoretical calculations suggested that charges on original NaCl aerosol particles enhanced the filtration efficiency of HEPA filters. |
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| Keywords: | Nebulization Artificial aerosol Electrical charges Charge distribution Electret HEPA filter Penetration |
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