Deposition rates on smooth surfaces and coagulation of aerosol particles inside a test chamber |
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| Authors: | Tareq Hussein Aleš Hruška Pavla Dohányosová Lucie Džumbová Jiří Hemerka Markku Kulmala Jiří Smolík |
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| Institution: | 1. University of Helsinki, Department of Physics, P.O. Box 64, FI-00014 Helsinki, Finland;2. Faculty of Mechanical Engineering CTU in Prague, Department of Environmental Engineering, Technická 4, CZ-16607 Praha 6, Prague, Czech Republic;3. Institute of Chemical Process Fundamentals, Laboratory of Aerosol Chemistry and Physics, Rozvojová 135, CZ-16502 Praha 6, Prague, Czech Republic;1. Department of Civil and Environmental Engineering, Clarkson University, PO Box 5712, Potsdam, NY 13699, USA;2. Department of Chemical and Environmental Engineering, Yale University, USA;1. Department of Civil and Environmental Engineering, Soochow University, Suzhou, China;2. Department of Mechanical Engineering, Soochow University, Suzhou, China;1. School of Architecture, Harbin Institute of Technology, Harbin 150000, China;2. Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China;3. Department of Physics, China Jiliang University, Hangzhou 310028, China;4. Heilongjiang Provincial Key Laboratory of Building Energy Efficiency and Utilization, Harbin 150000, China;5. Key Laboratory of Aerosol Chemistry and Physics, Chinese Academy of Sciences, Xi''an China;6. Harbin Multi-Phase Water Treatment Tech. Co., Ltd, Harbin 150000, China |
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| Abstract: | Because aerosol particle deposition is an important factor in indoor air quality, many empirical and theoretical studies have attempted to understand the process. In this study, we estimated the deposition rate of aerosol particles on smooth aluminum surfaces inside a test chamber. We investigated the influence of turbulent intensity due to ventilation and fan operation. We also investigated two important processes in particle deposition: turbophoresis, which is significant for micron particles, and coagulation, which is relevant to ultrafine particles (UFP diameter <0.1 μm) at high particle concentrations. Our analysis included semi-empirical estimates of the deposition rates that were compared to available deposition models and verified with simulations of an aerosol dynamics model. In agreement with previous studies, this study found that induced turbulent intensity greatly enhanced deposition rates of fine particles (FP diameter <1 μm). The deposition rate of FP was proportional to the ventilation rate, and it increased monotonically with fan speed. With our setup, turbophoresis was very important for coarse particles larger than 5 μm. The coagulation of aerosol particles was insignificant when the particle concentration was less than 104 cm?3 during fan operation. The model simulation results verified that the aerosol dynamics module incorporated in our Multi-Compartment and Size-Resolved Indoor Aerosol Model (MC-SIAM) was valid. The behavior of aerosol particles inside our chamber was similar to that found in real-life conditions with the same ventilation rates (0.018–0.39 h?1) and similar air mixing modes. Therefore, our findings provide insight into indoor particle behavior. |
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