A recent breakout of the COVID-19 pandemic inspired researchers to find ideal solutions for removing SARS-CoV-2 from indoor air. In-duct ultraviolet germicidal irradiation was employed in rooms with heating, ventilation, and air conditioning (HVAC) systems to stop the spread of COVID-19. The current investigation introduces Bunimovich stadium-inspired flow channels inside the square-shaped duct. The impact of the Bunimovich channel shape on light distribution is studied and compared with the traditional rectangular-shaped duct. The core of the Bunimovich channel is a square with δ and γ equal to 0.5. A semi-circle surrounds the square's left and right sides. The air velocity in the HVAC system with the Bunimovich channels varies from 10 m/s to 15 m/s, resulting in variation in aerosol particles’ residence period in front of the ultraviolet-C (UVC) source. The Bunimovich channel delivered better UVC irradiance uniformity than a rectangular duct. The uniformity ratio for the Bunimovich channel was 0.788 compared to 0.6949 for the rectangular duct. The UVC dose delivered by the source in the Bunimovich channel varies from 1.48 mJ/cm2 to 3.03 mJ/cm2. The delivered dose is higher than the required 1.2 mJ/cm2 dose for log-4 reduction (i.e. 99.99%).

中文翻译：

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基于布尼莫维奇体育场的紫外-C通道供暖、通风和空调管道设计与光学模拟

最近爆​​发的 COVID-19 大流行激发了研究人员寻找从室内空气中去除 SARS-CoV-2 的理想解决方案。在配有供暖、通风和空调 (HVAC) 系统的房间内采用管道内紫外线杀菌照射来阻止 COVID-19 的传播。目前的研究介绍了方形管道内受布尼莫维奇体育场启发的流动通道。研究了布尼莫维奇通道形状对光分布的影响，并与传统的矩形管道进行了比较。布尼莫维奇通道的核心是一个δ和γ等于0.5的正方形。正方形的左右两侧各有一个半圆。具有 Bunimovich 通道的 HVAC 系统中的空气速度从 10 m/s 到 15 m/s 不等，导致气溶胶颗粒在紫外线 C (UVC) 源前面的停留时间发生变化。 Bunimovich 通道比矩形管道提供更好的 UVC 辐照度均匀性。 Bunimovich 通道的均匀度比为 0.788，而矩形管道的均匀度比为 0.6949。 Bunimovich 通道中光源发出的 UVC 剂量变化范围为 1.48 mJ/cm2至 3.03 毫焦/厘米2。输送剂量高于所需的 1.2 mJ/cm22log-4 减少的剂量（即 99.99%）。