標題: Influence of impaction plate diameter and particle density on the collection efficiency of round-nozzle inertial impactors
作者: Huang, CH
Tsai, CJ
環境工程研究所
Institute of Environmental Engineering
公開日期: 1-Jun-2002
摘要: This study has investigated the influence of impaction plate diameter (Dc) and particle density on the particle collection efficiency of single round-nozzle inertial impactors numerically assuming incompressible flow. The study shows that computed rootSt(50) values range from 0.473 to 0.485, which are nearly independent of W/Dc (W is the nozzle diameter) for the nozzle Reynolds number, Re > 1500, and when W/Dc < 0.32. &RADIC;St(50) values agree quite well with the theoretical values of Rader and Marple (1985), 0.49, and Marple and Liu (1974), 0.477. For a smaller impactor plate diameter such that W/Dc > 0.32, rootSt(50) will increase slightly. It increases from 0.483 to 0.507 (Re = 3000) or from 0.479 to 0.495 (Re = 1500) when W/Dc is increased from 0.32 to 0.48. When the nozzle Reynolds number is smaller than 1500, the influence of W/Dc on rootSt(50) is found to be much more pronounced. The effect of particle density on the collection efficiency has also been investigated. When particle gravity is included, the results show that rootSt(50) is not affected by particle density ranging from 0.5 to 10 g/cm(3), although the particle collection efficiency increases slightly with increasing particle density at high ends of the collection efficiency curves at high nozzle Reynolds number due to an ultra-Stokesian effect. The particle interception effect does not affect the collection efficiency curves at high Reynolds numbers at all, and the effect is negligibly small at low Reynolds numbers.
URI: http://dx.doi.org/10.1080/02786820290038410
http://hdl.handle.net/11536/28775
ISSN: 0278-6826
DOI: 10.1080/02786820290038410
期刊: AEROSOL SCIENCE AND TECHNOLOGY
Volume: 36
Issue: 6
起始頁: 714
結束頁: 720
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