Removal of reactive gases at indoor surfaces: Combining mass transport and surface kinetics |
| |
| Institution: | 1. School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA;2. Environmental Control Systems, Boeing Commercial Airplanes, Everett, WA 98203, USA;3. School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China;1. Department of Environmental Engineering, Technical University of Crete, Polytechneioupolis, 73100 Chania, Greece;2. Norwegian Institute for Air Research (NILU), Instituttveien 18, 2007, Kjeller, Norway;1. Mechanical and Materials Engineering, Portland State University, Portland, OR, 97201, USA;2. Nanyang Technological University and Berkeley Education Alliance for Research in Singapore, Singapore, 138602;3. Architectural Engineering Department, Pennsylvania State University, University Park, PA, 16802, USA;1. Centre for Environmental Risk Assessment and Remediation, University of South Australia, Building X, Mawson Lakes Campus, South Australia 5095, Australia;2. Istituto di Ricerca Sulle Acque, Consiglio Nazionale delle Ricerche, Viale F. De Blasio 5, Bari 70123, Italy;3. Mawson Institute, University of South Australia, Building V, Mawson Lakes Campus, South Australia 5095, Australia;4. Department of Agricultural and Environmental Science – DISAAT, University of Bari Aldo Moro, 165/A Via G. Amendola, 70126 Bari, Italy;5. National Risk Management Research Laboratory, US Environmental Protection Agency, 5995 Centre Hill Avenue, Cincinnati, OH 45224, USA |
| |
| Abstract: | The rate of deposition of reactive gaseous pollutants onto indoor surfaces is examined, taking into account mass transport processes and the kinetics of gas-surface interactions. A conceptual model for predicting indoor deposition velocities is proposed, and approximate analysis based on this model is used to obtain algebraic expressions for the deposition velocity of reactive gases under three model airflow conditions: (1) forced laminar convection parallel to a flat plate, (2) laminar natural convection flow along an isothermal vertical plate, and (3) homogeneous turbulence in an enclosure. Numerical simulations are used to refine the approximate analysis results and to predict reactive gas deposition under laminar natural convection flow in an enclosure. The kinetics of gas-surface interactions are modeled in terms of the reaction probability γ, defined as the fraction of pollutant molecular collisions with a surface that result in irreversible removal. Values of γ for the reaction of ozone with surfaces are obtained from published reaction chamber and tube penetration experiments. For common indoor materials, values range from as low as O(10−7) for glass and aluminium to O(10−5–10−4) for materials such as bricks, concrete and latex paint. Our results indicate that ozone deposition occurs at the transport-limited rate when γ > − 3 × 10−4 for typical indoor air flow conditions, and that ozone deposition can be predicted by surface kinetics alone if γ < ∼ 5 × 10−7. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
