...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Building and Environment >Numerical analysis of particle deposition in ventilation duct
【24h】

Numerical analysis of particle deposition in ventilation duct

机译：通风管道内颗粒沉积的数值分析

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

This paper adopts computational fluid dynamics (CFD) to numerically analyze particle deposition in the ventilation duct. A three-dimensional drift-flux model combined with particle deposition boundary conditions for wall surfaces is presented. The numerical method is used to analyze the particle deposition velocity and deposited particle mass flux in the ventilation duct after validation. Twelve groups of particle size, two average air speeds in ducts are investigated to understand the particle deposition in the straight ventilation duct, which ensures a fully developed turbulent duct flow. And then, the particle accumulation by deposition in the ventilation duct is analyzed according to the cleaning code for air duct system in heating, ventilation and air conditioning (HVAC) systems of China. The cases with or without air filter installed are studied by assuming that the duct inlet particle concentration is that of outdoor air in Beijing city, China. The simulated results of dimensionless deposition velocity onto floor agree well with the measured data from others, while the discrepancies of vertical wall and ceiling are obvious. Both the simulated results in this paper and measured data from literature show that particle deposition onto the floor (upward wall) in the ventilation ducts is the most significant. The deposition velocity onto the floor is about 2 orders of magnitude larger than that onto the other walls of the duct. The filter is effective to defend the ventilation duct against particle pollution by deposition. A higher efficiency filter is helpful to postpone the cleaning time for ventilation duct, so the filter should be replaced often to maintain the filter efficiency.
机译：本文采用计算流体力学（CFD）对通风管道中的颗粒沉积进行数值分析。提出了结合壁面颗粒沉积边界条件的三维漂移流模型。验证后，使用数值方法分析通风管道中的颗粒沉积速度和沉积颗粒质量通量。研究了十二个颗粒大小，管道中的两个平均风速，以了解颗粒在直线通风管道中的沉积情况，从而确保充分发展的湍流管道流动。然后，根据中国供暖，通风和空调（HVAC）系统中风道系统的清洁规范，分析了在风道中沉积的颗粒堆积。通过假设管道进风口颗粒物浓度为中国北京市的室外空气浓度，研究安装或不安装空气过滤器的情况。地板上无量纲沉积速度的模拟结果与其他测得的数据吻合得很好，而垂直墙和天花板的差异很明显。本文的模拟结果和文献的实测数据均表明，颗粒在通风管道中的地板（上壁）上的沉积最为显着。在地板上的沉积速度比在管道其他壁上的沉积速度大约2个数量级。该过滤器可有效防止通风管道因沉积而污染颗粒。更高效率的过滤器有助于推迟通风管道的清洁时间，因此应经常更换过滤器以保持过滤器的效率。

著录项

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