標題: Thermophoretic deposition of particles in laminar and turbulent tube flows
作者: Tsai, CJ
Lin, JS
Aggarwal, SG
Chen, DR
環境工程研究所
Institute of Environmental Engineering
公開日期: 1-Feb-2004
摘要: Thermophoretic deposition of aerosol particles (particle diameter ranges from 0.038 to 0.498 mum) was measured in a tube (1.18 m long, 0.43 cm inner diameter, stainless steel tube) using monodisperse NaCl test particles under laminar and turbulent flow conditions. In the previous study by Romay et al., theoretical thermophoretic deposition efficiencies in turbulent flow regime do not agree well with the experimental data. In this study, particle deposition efficiencies due to other deposition mechanisms such as electrostatic deposition for particles in Boltzmann charge equilibrium and laminar and turbulent diffusions were carefully assessed so that the deposition due to thermophoresis alone could be measured accurately. As a result, the semiempirical equation developed by Lin and Tsai in laminar flow regime and the theoretical equation of Romay et al. in turbulent flow regime are found to fit the experimental data of thermophoretic deposition efficiency very well with the differences of less than 1.0% in both flow regimes. It is also found that Talbot's formula for the thermophoretic coefficient is accurate while Waldmann's free molecular formula is only applicable when Kn is greater than about 3.0.
URI: http://dx.doi.org/10.1080/02786820490251358
http://hdl.handle.net/11536/27066
ISSN: 0278-6826
DOI: 10.1080/02786820490251358
期刊: AEROSOL SCIENCE AND TECHNOLOGY
Volume: 38
Issue: 2
起始頁: 131
結束頁: 139
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