Burgmann Sebastian, Janoske Uwe
Phys Fluids (1994). 2021 Mar;33(3):033321. doi: 10.1063/5.0044046. Epub 2021 Mar 23.
SARS-CoV-2 (COVID-19) as an airborne respiratory disease led to a bunch of open questions: how teaching in classrooms is possible and how the risk of infection can be reduced, e.g., by the use of air purifier systems. In this study, the transmission of aerosols in a classroom is analyzed numerically and experimentally. The aerosol concentration in a classroom equipped with an air purifier system was measured with an aerosol spectrometer (optical particle sizer, TSI Incorporated) at different locations. The transient reduction of the aerosol concentration, which was artificially generated by an aerosol generator (di-ethyl hexyl sebacate-atomizer, detected particle size ranging from 0.3 to 10 m), was monitored. The experimental results were used to validate a numerical simulation model of the classroom using the Open Source Computational Fluid Dynamics code OpenFOAM® (version 6). With the numerical simulation model, different scenarios with infected persons in the room have been analyzed, showing that the air purifier system leads to a significant reduction of airborne particles in the room dependent on the location of the infected person. The system can support additional ventilation strategies with fresh air, especially in cold seasons.
严重急性呼吸综合征冠状病毒2（SARS-CoV-2，即新冠病毒）作为一种空气传播的呼吸道疾病引发了一系列亟待解决的问题：如何在教室中进行教学以及如何降低感染风险，例如通过使用空气净化系统来实现。在本研究中，对教室中气溶胶的传播进行了数值分析和实验研究。使用气溶胶光谱仪（光学粒子计数器，TSI公司）在配备空气净化系统的教室中的不同位置测量气溶胶浓度。监测了由气溶胶发生器（癸二酸二乙酯雾化器，检测到的粒径范围为0.3至10微米）人工产生的气溶胶浓度的瞬态降低情况。实验结果用于验证使用开源计算流体动力学代码OpenFOAM®（版本6）建立的教室数值模拟模型。利用该数值模拟模型，分析了室内有感染者的不同场景，结果表明空气净化系统可使室内空气中的颗粒物显著减少，减少程度取决于感染者的位置。该系统可辅助采用新鲜空气进行额外通风的策略，尤其在寒冷季节。
