Solution for sudden contamination transport through air duct system: Under a puff release
Solution for sudden contamination transport through air duct system: Under a puff release
复制标题
通过风道系统突然输送污染物的解决方案：在抽吸释放下
DOI：
10.1016/j.buildenv.2016.01.024
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发表时间：
2016
影响因子：
7.4
通讯作者：
Xu Zhang
中科院分区：
文献类型：
--
作者：
Jun Gao;Lingjie Zeng;Li Wu;Xihui Ding;Xu Zhang
当化学或生物制剂突然释放到通风管道中时，应迅速准确地确定沿着整个管道系统的制剂浓度。在这项工作中，对流扩散模型的建议来计算剂在空气管道中的传输。建立了一个节点模型，用于描述管道连接处的药剂扩散。在管道系统中的药剂的喷吹喷射下，将两个模型集成以导出浓度动态的理论解。以癸二酸二乙己酯（DEHS）气溶胶为代表性污染物，进行了管道内浓度动态实验。即使在截面积非常大的情况下，理论预测与实验结果也吻合得很好。在这项研究中，时间特性进一步定义和讨论，研究剂浓度沿着流动方向在管道系统中的连续正态分布模式。这样的讨论有助于确定药剂在抽吸释放后到达并经过某个位置的确切时间。它还用于获得管道系统出口处的潜在暴露。预计目前的工作将有助于对通风管道系统中可能发生的化学或生物制剂攻击进行预警和确定来源。
When a chemical or biological agent is suddenly released into ventilation ducts, agent concentration along the whole ductwork should be promptly and accurately determined. In this work, an advection-diffusion model was suggested to calculate the agent transport in the air ducts. A node model was constructed for the agent dispersion at the duct junctions. Under a puff injection of the agent in the ductwork, the two models were integrated to derive the theoretical solution for the concentration dynamics. An experiment, using DEHS (diethylhexyl sebacate) aerosols as the representative agent pollution, was conducted to present the concentration dynamics within an air ductwork. Well agreement was observed between the theoretical predictions and the experimental results even with the extremely large sectional area. In this study, time characteristics were further defined and discussed to investigate the continuous normal distribution pattern of agent concentration along the flow direction in the ductwork. Such discussion helped to determine the exact time when the agent arrived at and traveled through a certain location after a puff release. It was also used to obtain the potential exposure at the outlets of the ductwork. The present work was expected to assist the early-warning and source identification of a potential chemical or biological agent attack in the ventilation ductwork.