Enhancement of submicron particle deposition on a semi-circular surface in turbulent flow
| Autor: | Haolun Xu, Christopher Y.H. Chao, Wing Tong Leung, Sau Chung Fu, Tsz Wai Lai |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
010504 meteorology & atmospheric sciences Turbulence Suspended particles Public Health Environmental and Occupational Health Air pollution Mechanics 010501 environmental sciences medicine.disease_cause 01 natural sciences Air cleaner Circular surface medicine 0105 earth and related environmental sciences Particle deposition |
| Zdroj: | Indoor and Built Environment. 29:101-116 |
| ISSN: | 1423-0070 1420-326X |
| DOI: | 10.1177/1420326x19853862 |
| Popis: | Air pollution due to suspended particles in the built environment threatens people’s health. The collection of submicron particles using air cleaners is especially difficult due to their tiny sizes. Surface patterned structures can enhance submicron particle deposition, thus improving the performance of an air cleaner. In this study, a semi-circular micro-structured surface was designed and optimized by considering particle deposition enhancement and reduction of pressure differential. The maximum efficiency ratio at the pitch-to-height ratio ([Formula: see text]) of 3 reached 1137 for the 1 µm particles but only 3.4 for 0.01 µm particles. The main mechanism of enhancing submicron particle deposition depends on the capture of the recirculation wake induced by semi-circular structures and entrainments of large turbulence kinetic energy to the near-wall regions. Submicron particles was observed to deposit between cavities on the semi-circular surface at a small [Formula: see text]. This study shows that surface patterned structures in the semi-circular shape at small [Formula: see text] can enhance the submicron deposition efficiency, thus providing a possible approach to improve the overall efficiency of air cleaners. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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