Development of a multi-slit virtual impactor as a high-volume bio-aerosol sampler
- Authors
- Lim, Jun-Hyung; Park, Daeui; Yook, Se-Jin
- Issue Date
- Nov-2020
- Publisher
- ELSEVIER
- Keywords
- Virtual impactor; Slit nozzle; Collection efficiency; Clean air; Wall loss
- Citation
- SEPARATION AND PURIFICATION TECHNOLOGY, v.250, pp.1 - 9
- Indexed
- SCIE
SCOPUS
- Journal Title
- SEPARATION AND PURIFICATION TECHNOLOGY
- Volume
- 250
- Start Page
- 1
- End Page
- 9
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/8804
- DOI
- 10.1016/j.seppur.2020.117275
- ISSN
- 1383-5866
- Abstract
- Virtual impactors are capable of aspirating aerosols in the air, concentrating particles of a certain size, and discharging these particles through a minor flow. In general, commonly used virtual impactor has a cut-off size of 1 mu m or more, a concentration ratio of 10-20 times, and an operating flowrate of 10 L/min; it is used to increase the detection probability of various aerosol measuring equipment. In this study, we developed a special-purpose virtual impactor aimed at the mass capturing of aerosols, including pathogens released by human respiration or coughing. For this purpose, we designed a virtual impactor exceeding the typical operating range, with a cut-off size of 0.3 mu m and a concentration ratio of 13.3. Five multi-slit nozzles were adopted to indicate a cut diameter of 0.3 mu m for a high aerosol flowrate of 170 L/min. Clean air was injected near the nozzle wall of the virtual impactor to minimize wall loss and further reduce the cut-off size. The performance of the designed virtual impactor was verified through numerical analyses and experimentation. As a result, aerosol aspirated at 170 L/min of flowrate was effectively concentrated in the minor flow with a cut-off size of 0.3 mu m.
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