Previous studies reported that specially designed ventilation systems provide good air quality and safe environment by removing airborne droplets that contain viruses expelled by infected people. These water droplets can be stable in the environment and remain suspended in air for prolonged periods. Encounters between droplets may occur and droplet interactions should be considered. However, the previous studies focused on other physical phenomena (air flow, drag force, evaporation) for droplet transport and neglected droplet interactions. In this work, we used computational fluid dynamics (CFD) to simulate the transport and fate of airborne droplets expelled by an asymptomatic person and considered droplet interactions. Droplet drag with turbulence for prediction of transport and fate of droplets indicated that the turbulence increased the transport of 1 µm droplets, whereas it decreased the transport of 50 µm droplets. In contrast to only considering drag and turbulence, consideration of droplet interactions tended to increase both the transport and fate. Although the length scale of the office is much larger than the droplet sizes, the droplet interactions, which occurred at the initial stages of release when droplet separation distances were shorter, had a significant effect in droplet fate by considerably manipulating the final locations on surfaces where droplets adhered. Therefore, it is proposed that when an exact prediction of transport and fate is required, especially for high droplet concentrations, the effects of droplet interactions should not be ignored.

先前的研究报告称，专门设计的通风系统通过去除空气中含有被感染者排出的病毒的飞沫，提供良好的空气质量和安全的环境。这些水滴可以在环境中保持稳定并长时间悬浮在空气中。液滴之间可能会发生相遇，应考虑液滴相互作用。然而，以前的研究集中在液滴传输的其他物理现象（气流、阻力、蒸发）上，而忽略了液滴相互作用。在这项工作中，我们使用计算流体动力学 (CFD) 来模拟无症状人员排出的空气中飞沫的运输和命运，并考虑飞沫相互作用。具有湍流的液滴阻力预测液滴的运输和命运表明湍流增加了 1 µm 液滴的运输，而减少了 50 µm 液滴的运输。与仅考虑阻力和湍流相比，考虑液滴相互作用往往会增加运输和命运。尽管办公室的长度尺度远大于液滴大小，但在液滴分离距离较短时发生在释放初始阶段的液滴相互作用通过显着操纵表面上的最终位置，对液滴命运产生了显着影响。附着的液滴。因此，建议当需要准确预测运输和归宿时，尤其是对于高液滴浓度，