| 可吸入颗粒物在管内湍流流动时的动力学特性及热泳沉积 |
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| 引用本文： | 杨瑞昌,刘若雷,周涛,赵磊. 可吸入颗粒物在管内湍流流动时的动力学特性及热泳沉积[J]. 中国化学工程学报, 2008, 16(2): 192-197. DOI: 10.1016/S1004-9541(08)60061-0 |
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| 作者姓名： | 杨瑞昌 刘若雷 周涛 赵磊 |
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| 作者单位： | Department of Thermal Engineering, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China |
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| 基金项目： | 国家重点基础研究发展计划(973计划) |
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| 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 re- sults show that the deposition efficiencies of PM2.5 mainly depend on the temperature difference between the air and the cold wail, wffile the air flow rate and the particlecon~centration almost affect hardly tile clep0si-tion-effi ciency. The radial force thermophoresis to push PM2.5 to the cold wail 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 presenlext. The empirical correlation agrees reasonably well with the experimental data.
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| 关 键 词： | inhalable particles thermophoresis deposition efficiency |
| 收稿时间： | 2007-05-14 |
| 修稿时间： | 2007-05-14 |
Kinematic characteristics and thermophoretic deposition of inhalable particles in turbulent duct flow |
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| YANG Ruichang,LIU Ruolei,ZHOU Tao,ZHAO Lei. Kinematic characteristics and thermophoretic deposition of inhalable particles in turbulent duct flow[J]. Chinese Journal of Chemical Engineering, 2008, 16(2): 192-197. DOI: 10.1016/S1004-9541(08)60061-0 |
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| Authors: | YANG Ruichang LIU Ruolei ZHOU Tao ZHAO Lei |
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| Affiliation: | Department of Thermal Engineering, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China |
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| Abstract: | The kinematical characteristics and thermophoretic deposition of inhalable particles with the diametersof 0-2.5μm (hereafter referred to as PM2.5) suspended in turbulent air flow in a rectangular duct with temperaturedistribution were experimentally studied. Particle dynamics analyzer (PDA) was used for the on-hne measurementof 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 ducton 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 airand 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 thermophoreticdeposition efficiency of PM2.5 is presented. The empirical correlation agrees reasonably well with the experimental data. |
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| Keywords: | inhalable particles thermophoresis deposition efficiency |
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