Computational and experimental study of aerosol dispersion in a ventilated room
Computational and experimental study of aerosol dispersion in a ventilated room
复制标题
通风室内气溶胶扩散的计算与实验研究
DOI：
10.1080/02786826.2022.2145179
复制
发表时间：
2022
影响因子：
5.2
通讯作者：
Downing G
中科院分区：
文献类型：
--
作者：
Downing G
对于许多呼吸道疾病，主要的传播方式是通过气溶胶和飞沫吸入。COVID-19大流行加速了对室内环境中气溶胶扩散的研究。大多数气溶胶扩散的研究都是计算流体动力学的结果，很少包括详细的实验验证，而且许多计算很复杂，很难扩展到更大的空间。本研究提出了一个典型的通风教室内气溶胶扩散的计算模拟和测量的比较。测量使用定制的低成本传感器网络完成，该网络由15个市售光学粒度仪组成，可提供有关0.3-40µm直径颗粒的数量浓度和时间动态的尺寸分辨信息。测量结果与稳态reynolds - average Navier-Stokes k-epsilon模型计算的扩散和损失率进行了比较。结果表明，新建立的气溶胶输运模型能准确地模拟气溶胶的扩散，并能准确地预测不同地点和时间的气溶胶浓度。计算模型的开发考虑了可伸缩性，因此它可以适用于更大的空间。实验结果表明，通风系统中气溶胶的回收量取决于气溶胶液滴的大小，而不能通过循环空气与外界空气的比率来预测。此外，正如一些计算方法所假定的那样，气溶胶再循环是不可忽略的。模拟和测量都表明，根据房间内的位置，最大气溶胶浓度可能比平均浓度高出许多倍，从而增加了感染的风险。
For many respiratory diseases, a primary mode of transmission is inhalation via aerosols and droplets. The COVID-19 pandemic has accelerated studies of aerosol dispersion in indoor environments. Most studies of aerosol dispersion present computational fluid dynamics results, which rarely include detailed experimental verification, and many of the computations are complex, making them hard to scale to larger spaces. This study presents a comparison of computational simulations and measurements of aerosol dispersion within a typical ventilated classroom. Measurements were accomplished using a custom-built low-cost sensor network composed of 15 commercially available optical particle sizers, which provided size-resolved information about the number concentrations and temporal dynamics of 0.3–40 µm diameter particles. Measurement results are compared to the computed dispersal and loss rates from a steady-state Reynolds-Averaged Navier–Stokes k-epsilon model. The results show that a newly developed aerosol-transport-model can accurately simulate the dispersion of aerosols and faithfully predict measured aerosol concentrations at different locations and times. The computational model was developed with scalability in mind such that it may be adapted for larger spaces. The experiments highlight that the fraction of aerosol recycled in the ventilation system depends on the aerosol droplet size and cannot be predicted by the recycled-to-outside air ratio. Moreover, aerosol recirculation is not negligible, as some computational approaches assume. Both modeling and measurements show that, depending on the location within the room, the maximum aerosol concentration can be many times higher than the average concentration, increasing the risk of infection.
登录
查看更多内容
影响因子：
13.6
作者：
Hedworth HA;Karam M;McConnell J;Sutherland JC;Saad T
通讯作者：
Saad T
估算通风系统中空气再循环的简单方法
DOI：
--
发表时间：
1988
期刊：
影响因子：
--
作者：
C. Göthe;R. Bjurström;K. Ancker
通讯作者：
K. Ancker
DOI：
10.1063/1.168744
发表时间：
1998-11-01
期刊：
COMPUTERS IN PHYSICS
影响因子：
--
作者：
Weller, HG;Tabor, G;Fureby, C
通讯作者：
Fureby, C
SARS-CoV-2 的空气传播是主要传播途径：飞沫和气溶胶。
DOI：
--
发表时间：
2021
期刊：
Le infezioni in medicina
影响因子：
--
作者：
A. Rabaan;Shamsah H. Al;M. Al;R. Alsubki;S. Ezzikouri;F. Al;R. Sah;Abbas Al Mutair;S. Alhumaid;J. Al;Awad Al;Ayman M Al;M. Al;R. Tirupathi;Mohammad Al Hamad;N. Al;T. Sulaiman;Arwa Alsubait;Rachana Mehta;Elfadil Abass;M. Alawi;F. Alshahrani;D. Shrestha;M. Karobari;S. Pecho;K. Arteaga;D. C. Bonilla Aldana;A. Rodríguez
通讯作者：
A. Rodríguez
旋转对快速剪切均匀湍流和被动标量传输的影响。
影响因子：
3.7
作者：
G. Brethouwer
通讯作者：
G. Brethouwer