...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Size-Resolved Ultrafine Particle Deposition and Brownian Coagulation from Gasoline Vehicle Exhaust in an Environmental Test Chamber
【24h】

Size-Resolved Ultrafine Particle Deposition and Brownian Coagulation from Gasoline Vehicle Exhaust in an Environmental Test Chamber

机译：在环境试验室中汽油车尾气的尺寸分辨超细颗粒沉积和布朗尼凝结

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Size-resolved deposition rates and Brownian coagulation of particles between 20 and 900 nm (mobility diameter) were estimated in a well-mixed environmental chamber from a gasoline vehicle exhaust with a total peak particle concentration of 10~5-10~6 particles/cm~3 at 12.24-25.22 ℃. A deposition theory with modified friction velocity and coagulation model was also employed to predict particle concentration decay. Initially during particle decay, approximately 85% or more of the particles had diameters of ＜ 100 nm. Particle deposition rates with standard deviations were highly dependent on particle size ranges, and varied from 0.012 ± 0.003 to 0.48 ± 0.02 h~(-1). In the experiment, the friction velocity obtained was in the range 1.5-2.5 cm/s. The most explainable fractal dimension and Hamaker constant in coagulation model were 2.5-3 and 20 kT, respectively, and the contribution from coagulation dominated the total particle decay during the first 1 h of decay. It is considered that the modified friction velocity and best fitted fractal dimension and Hamaker constants could be further used to analyze gasoline vehicle exhaust particle dynamics and assess human exposure to vehicle particle pollutants in urban areas, tunnels, and underground parking lots.
机译：在一个充分混合的环境室中，从汽油车尾气中估算出尺寸分解的沉积速率和20-900 nm（迁移率直径）之间的粒子的布朗凝聚现象，总峰值粒子浓度为10〜5-10〜6个粒子/ cm在12.24-25.22℃〜3。还采用了具有改进的摩擦速度和凝固模型的沉积理论来预测颗粒浓度的衰减。最初，在粒子衰减期间，大约85％或更多的粒子的直径<100 nm。具有标准偏差的颗粒沉积速率高度依赖于颗粒尺寸范围，并且在0.012±0.003至0.48±0.02h〜（-1）之间变化。在实验中，获得的摩擦速度在1.5-2.5cm / s的范围内。在混凝模型中，最可解释的分形维数和Hamaker常数分别为2.5-3和20 kT，并且在衰变的前1 h，凝结作用占总颗粒衰变的主导。人们认为，修改后的摩擦速度，最佳拟合分形维数和Hamaker常数可进一步用于分析汽油车辆排气颗粒动力学，并评估人类在市区，隧道和地下停车场中暴露于车辆颗粒污染物的程度。

著录项

  • 来源
    《Environmental Science & Technology》 |2015年第20期|12153-12160|共8页
  • 作者

    Yu Zhao; Fang Wang; Jianing Zhao;

  • 作者单位

    School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China;

    School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China;

    School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号