BPCPPDYSOE21 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 27: Fluid Physics 3 - organized by Stephan Weiss and Michael Wilczek (Göttingen)

DY 27.1: Hauptvortrag

Dienstag, 23. März 2021, 14:00–14:30, DYa

Human exhaled particles from nanometres to millimetres — •Gholamhossein Bagheri — Max Planck Institute for Dynamics and Self-Organization, Goettingen, Germany

COVID-19 and other airborne diseases are transmitted to healthy individuals by inhalation of pathogen-containing particles exhaled by infectious persons. Here I provide an overview of the mechanisms involved in formation of these particles and the flow physics of the exhaled air. I will present results of our comprehensive experimental study to characterise the size distribution of exhaled particles from more than 125 subjects aged 5-88 years using aerosol size spectrometers and in-line holography. I will also discuss the physics of the exhalation flows during different respiratory manoeuvres by presenting results from our size-resolved three-dimensional particle tracking imaged at 10-15 kHz, which are furthermore complemented by two-dimensional optical flow measurements. In total, we have collected and analysed 200 h of exhalation samples with the spectrometers, 9000 holograms, and more than three million images from the high-speed cameras. With this database, we are now able to predict risk of infection from human exhaled particles in indoor environments using conventional infection models as shown in our multilingual web application (https://aerosol.ds.mpg.de). Finally, we have further improved risk assessment models to account for particles containing multiple pathogens. This research is funded by the Max Planck Society, Universitätsmedizin Göttingen and Bundesweites Forschungsnetz Angewandte Surveillance und Testung project.