Mechanisms of indoor aerosol spread considering particle interactions and drying kinetics

就冠状病毒大流行而言，为了最大限度地减少感染风险，需要准确了解室内气溶胶传播机制。本研究项目的目的是考虑到颗粒的干燥动力学和动态相互作用，对空气中潜在含病毒气溶胶的传播机制进行实验表征。除了已知的通过飞沫传播传染病的途径外，本项目还将调查另一种传播的可能性，即病毒可以附着在汽化的气溶胶飞沫和空气中的灰尘的固体残留物（核）上，并可以远距离传播。以下研究问题将被调查：-唾液气溶胶在真实的室内空气环境中的传播行为是什么？-空气中唾液滴的干燥动力学与粉尘浓度的关系是什么？蒸发后残留物质的形态是什么？-液滴和液滴核在蒸发后与空气中的粒子有什么相互作用？尘埃粒子如何影响气溶胶的扩散？在本项目中，将对考虑液滴干燥动力学及其与细尘粒子相互作用的气溶胶扩散进行广泛的实验研究。通过这项调查，将了解影响室内潜在含病毒气溶胶传播的基本物理机制和效果。基于这些知识，可以在后续项目中开发出普遍适用的气溶胶扩散物理模型。

In connection with the corona pandemic, in order to minimize risk of the infection, a precise understanding of the indoor aerosol spreading mechanisms is required. The aim of this research project is the experimental characterization of the spreading mechanisms of potentially virus-containing aerosols in the air, considering the drying kinetics and dynamic interactions of the particles. Besides the known transmission routes of infectious diseases via droplets, this project will investigate another possibility of transmission, where the virus can attach to the solid residues (nuclei) of vaporized aerosol droplets and dust from the air and can be transported over long distances.The following research questions will be investigated:- What is the spreading behavior of a saliva aerosol in a real room air environment?- What is the drying kinetics of the saliva droplets in air as a function of dust concentration? What is the morphology of the residual substances after evaporation?- What interactions do the droplets and droplet nuclei exhibit with the airborne particles after evaporation? How do the dust particles influence the spreading of the aerosol?In this project, extensive experimental investigations of the aerosol spreading considering drying kinetics of droplets and their interactions with fine dust particles will be performed. Through this investigation, the basic physical mechanism and effect will be understood that influence the spreading of potentially virus-containing aerosols in a room. Based on this knowledge, a generally applicable physical model of aerosol spreading can be developed in subsequent projects.