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《中国化学工程学报(英文版)》 2008-02
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Kinematic Characteristics and Thermophoretic Deposition of Inhalable Particles in Turbulent Duct Flow

YANG Ruichang , LIU Ruolei , ZHOU Tao and ZHAO Lei Department of Thermal Engineering, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China  
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 pa- rameters 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 re- sults 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 effi- ciency. 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.
【Fund】: the Special Funds for Major State Basic Research Project of China (2002CB211604)
【CateGory Index】: TQ021.1
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1 LIU Ruolei,YANG Ruichang,YOU Changfu,ZHAO Lei,ZHOU Tao(Department of Thermal Engineering,Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Tsinghua University,Beijing 100084,China);Kinematic characteristics and thermophoretic deposition of inhalable particles in temperature gradient field[J];Journal of the Chemical Industry and Engineering Society of China;2009-07
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