Kinematic Characteristics and Thermophoretic Deposition of Inhalable Particles in Turbulent Duct Flow

›› 2008, Vol. 16 ›› Issue (2): 192-197.

Kinematic Characteristics and Thermophoretic Deposition of Inhalable Particles in Turbulent Duct Flow

杨瑞昌, 刘若雷, 周涛, 赵磊

Department of Thermal Engineering, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China

收稿日期:2007-05-14 修回日期:2008-01-07 出版日期:2008-04-28 发布日期:2008-04-28
通讯作者: YANG Ruichang,E-mail:yangrc@mail.tsinghua.edu.cn
基金资助:
the Special Funds for Major State Basic Research Project of China (2002CB211604)

Kinematic Characteristics and Thermophoretic Deposition of Inhalable Particles in Turbulent Duct Flow

YANG Ruichang, LIU Ruolei, ZHOU Tao, ZHAO Lei

Department of Thermal Engineering, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China

Received:2007-05-14 Revised:2008-01-07 Online:2008-04-28 Published:2008-04-28
Supported by:
the Special Funds for Major State Basic Research Project of China (2002CB211604)

摘要/Abstract

摘要： The kinematical characteristics and thermophoretic deposition of inhalable particles with the diameters of 0-2.5μm (hereafter referred to as PM2.5) suspended in turbulent air flow in a rectangular duct with temperature distribution were experimentally studied. Particle dynamics analyzer (PDA) was used for the on-line measurement of particle motion and particle concentration distribution in the cross-sections of the duct. The influences of the parameters such as the ratio of the bulk air temperature to the cold wall temperature and the air flow rate in the duct on the kinematical characteristics and the deposition efficiencies of PM2.5 were investigated. The experimental results show that the deposition efficiencies of PM2.5 mainly depend on the temperature difference between the air and the cold wall, while the air flow rate and the particle concentration almost affect hardly the deposition efficiency. The radial force thermophoresis to push PM2.5 to the cold wall is found the key factor for PM2.5 deposition. Based on the experimental results, an empirical modified Romay correlation for the calculation of thermophoretic deposition efficiency of PM2.5 is presented. The empirical correlation agrees reasonably well with the experimental data.

关键词: inhalable particles, thermophoresis, deposition efficiency

Abstract: The kinematical characteristics and thermophoretic deposition of inhalable particles with the diameters of 0-2.5μm (hereafter referred to as PM2.5) suspended in turbulent air flow in a rectangular duct with temperature distribution were experimentally studied. Particle dynamics analyzer (PDA) was used for the on-line measurement of particle motion and particle concentration distribution in the cross-sections of the duct. The influences of the parameters such as the ratio of the bulk air temperature to the cold wall temperature and the air flow rate in the duct on the kinematical characteristics and the deposition efficiencies of PM2.5 were investigated. The experimental results show that the deposition efficiencies of PM2.5 mainly depend on the temperature difference between the air and the cold wall, while the air flow rate and the particle concentration almost affect hardly the deposition efficiency. The radial force thermophoresis to push PM2.5 to the cold wall is found the key factor for PM2.5 deposition. Based on the experimental results, an empirical modified Romay correlation for the calculation of thermophoretic deposition efficiency of PM2.5 is presented. The empirical correlation agrees reasonably well with the experimental data.

Key words: inhalable particles, thermophoresis, deposition efficiency

杨瑞昌, 刘若雷, 周涛, 赵磊. Kinematic Characteristics and Thermophoretic Deposition of Inhalable Particles in Turbulent Duct Flow[J]. , 2008, 16(2): 192-197.

YANG Ruichang, LIU Ruolei, ZHOU Tao, ZHAO Lei. Kinematic Characteristics and Thermophoretic Deposition of Inhalable Particles in Turbulent Duct Flow[J]. , 2008, 16(2): 192-197.

参考文献

1 Nishio, G., Kitani, S., Takahashi, K., “Thermophoretic deposition of aerosol particles in a heat-exchanger pipe”, Ind. Eng. Chem. Process Des. Dev., 13 (4), 408-415 (1974).
2 Walker, K.L., Homsy, G.M., Geyling, R.T., “Thermophoretic deposition of small particles in laminar tube flow”, J. Colliod Interface Sci., 69 (l), l38-l47 (1979).
3 Wu, C.K., Greif, R., “Thermophoretic deposition including an application to the outside vapor deposition process”, Int. J. Heat Mass Transfer, 39 (7), l429-l438 (1996).
4 Stratmann, F., Fissan, H., Papperger, A., Friedlander, S., “Suppression of particle deposition to surfaces by the thermophoretic force”, Aerosol Sci. Technol., 9, 115-l21 (1988).
5 Bae, G.N., Lee, C.S., Park, S. O., “Measurements and control of particle deposition velocity on a horizontal wafer with thermophoretic effect”, Aerosol Sci. Technol., 23, 32l-330 (1995).
6 Morawska, L., Zhang, J., “Combustion sources of particles: Health relevance and source signatures”, Chemosphere, 49, 1045-1058 (2002).
7 Zhou, Y., Levy, J.I., “Estimating population exposure to power plant emissions using CALPUFF: A case study in Beijing, China”, Atmos. Environ., 37 (6), 815-826 (2003).
8 Messerer, A., Niessner, R., P schl, U., “Thermophoretic deposition of soot aerosol particles under experimental conditions relevant for modern diesel engine exhaust gas systems”, J. Aerosol Sci., 34 (8), 1009-1021 (2003).
9 Zhou, T., Wang, Z.H., Yang, R.C., “Optimization and improvement of PM2.5 thermophoretic deposition efficiency in turbulent gas flowing over tube surfaces”, J. Colliod Interface Sci., 289 (1), 36-41 (2005).
10 Montassier, N., Boulaud, D., Stratmann, F., Fissan, H., “Comparison between experimenta1 study and theoretical model of thermophoretic particle deposition in laminar tube flow”, J. Aerosol Sci., 2l, S85-S88 (1990).
11 Montassier, N., Boulaud, D., Renoux, A., “Experimental study of thermophoretic particle deposition in laminar tube flow”, J. Aerosol Sci., 22 (5), 677-687 (1991).
12 Stratmann, F., Otto, E., Fissan, H., “Thermophoretic and diffusional particle transport in cooled laminar tube flow”, J. Aerosol Sci., 25 (7), l305-l3l9 (1994).
13 Chen, C.Y., (Arun) Ranade, M.B., Gentry, J.W., “Thermophoretic deposition in flow along an annular cross-section: Experiment and simulation”, J. Aerosol Sci., 38 (3), 407-428 (1995).
14 Lin, J.S., Tsai, C.J., “Thermophoreic deposition efficiency in a cylindrical tube taking into account developing flow at the entrance region, Aerosol Sci., 34, 569-583 (2003).
15 Zahmatkesh, I., “On the importance of thermophoresis and Brownian diffusion for the deposition of microand nanoparticles”, Int. Commun. Heat Mass Transfer, 35 (3), 369-375 (2008).
16 Batchelor, G.K., Shen, C., “Thermophoretic deposition of particles in gas flowing over cold surface”, J. Colliod Interface Sci., 107 (1), 21-37 (1985).
17 He, C., Ahmadi, G., “Particle deposition with thermophoresis in laminar and turbulent duct flows”, Aerosol Sci. Technol., 29, 525-546 (1998).
18 Tsai, C.J., Lin, J.S., Aggarwal, S.G., Chen, D.R., “Thermophoretic deposition of particles in laminar and turbulent tube flows”, Aerosol Sci. Technol., 38, 131-139 (2004).
19 Byers, R.L., Calvert, S., “Particle deposition from turbulent streams by means of thermal force”, Ind. Eng. Chem. Fundam., 8 (4), 646-655 (1969).
20 Wood, N.B., “The mass transfer of particles and acid vapour to cooled surfaces”, J. Inst. Energy, 76, 76-93 (1981).
21 Romay, F.J., Takagaki, S.S., Pui, D.Y.H., Liu, B.Y.H., “Thermophoretic deposition of aerosol particles in turbulent tube flow”, J. Aerosol Sci., 29 (8), 943-959 (1998).
22 Zhou, L.X., Theory and Numerical Modeling of Turbulent Gas-Particle Flows and Combustion, Science Press and CRC Press, Beijing (1993). 23 Zhang, Z.S., Cui, G.X., Fluid Dynamitics, Tsinghua University Press, Beijing, 321-322 (1999). (in Chinese)
24 Talbot, L., Cheng, R.K., Chefer, R.W., Willis, D.R., “Thermophoresis of particles in a heated boundary layer”, J. Fluid Mech., 101 (4), 737-758 (1980).
25 Gnielinski, V., “New equations for heat and mass transfer in turbulent pipe and channel flows”, Int. Chem. Eng., 16, 359-368 (1976).

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Kinematic Characteristics and Thermophoretic Deposition of Inhalable Particles in Turbulent Duct Flow

Kinematic Characteristics and Thermophoretic Deposition of Inhalable Particles in Turbulent Duct Flow

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