Al-Farabi Kazakh National University, Almaty, Republic of Kazakhstan.
Kazakh British Technical University, Almaty, Republic of Kazakhstan.
Environ Sci Pollut Res Int. 2023 Mar;30(12):33206-33228. doi: 10.1007/s11356-022-24067-5. Epub 2022 Dec 7.
This paper presents the numerical results of particle propagation in open space, taking into account the temperature of the human body and the surface of the ground. And also, the settling of particles or droplets under the action of gravitational force and transport in the open air is taken into account, taking into account the temperature during the process of breathing and sneezing or coughing. The temperature of the body and the surface of the ground, different rates of particle emission from the mouth, such as breathing and coughing or sneezing, are numerically investigated. The effect of temperature, cross-inlet wind, and the velocity of particle ejection from a person's mouth on social distancing is being investigated using a numerical calculation. The variable temperature of the human body forms a thermal plume, which affects the increase in the trajectory of the particle propagation, taking into account the lateral air flow. The thermal plume affects the particles in the breathing zone and spreads the particles over long distances in the direction of the airflow. The result of this work shows that in open space, taking into account the temperature of the body and the surface of the ground, a 2-m social distance may be insufficient for the process of sneezing and social distance must be observed depending on the breathing mode.
本文给出了在开放空间中考虑人体温度和地面温度时颗粒传播的数值结果。此外，还考虑了在呼吸和打喷嚏或咳嗽过程中考虑温度时，颗粒或液滴在重力作用下的沉降和在空气中的传输。数值研究了人体温度和地面温度、从口腔中以不同速率释放的颗粒，例如呼吸、咳嗽或打喷嚏。使用数值计算研究了温度、交叉入口风以及人从口腔中喷射颗粒的速度对社会隔离的影响。人体的可变温度形成热羽流，这会影响颗粒传播轨迹的增加，并考虑到横向气流。热羽流会影响呼吸区域内的颗粒，并使颗粒在气流方向上远距离扩散。这项工作的结果表明，在开放空间中，考虑到人体温度和地面温度，2 米的社交距离可能不足以防止打喷嚏过程中的飞沫传播，必须根据呼吸方式保持社交距离。
