Researchers at the University of Cambridge and Imperial College London in the United Kingdom said that when speaking, they spit out small droplets, or aerosols, that easily spread around the room and accumulate in poorly ventilated areas. In contrast, coughs expel larger droplets, which they are likely to settle on the surface after being released, they said. Scientists agree that the majority of Covid-19 cases, whether aerosols or droplets, are spread by indoor infections.
Researchers pointed out that it only takes a few seconds for the aerosol to spread to 2 meters without a mask. This means that the physical distance in the absence of ventilation is not sufficient to provide the safety of long exposure. However, they said that wearing any type of mask slows breathing, filters some of the exhaled droplets, and reduces the amount of virus in the aerosol that can spread throughout the space. ..
The team has developed a mathematical model that shows how the SARS-CoV-2 virus that causes Covid-19 spreads to different indoor spaces, depending on size, occupancy, ventilation, and whether a mask is worn. I used it. Based on the results of the model, the researchers developed Airborne.cam. It’s a free open source tool that helps users understand how ventilation and other measures affect the risk of indoor infections and how that risk changes over time. The team used the characteristics of the virus, such as the infected person’s spoilage rate and viral load, to estimate the risk of infection in the indoor environment due to normal speech or short coughing by the infected person.
For example, we have shown that the risk of infection after an hour of speaking in a typical lecture room is high, but proper ventilation can significantly reduce the risk. Researchers say Airborne.cam can be used by people who manage public spaces such as stores, workplaces, and classrooms to determine if ventilation is appropriate. “This tool helps us use fluid mechanics to make better choices, adapt our daily activities and environment, and reduce the risk of both ourselves and others,” co-authored the study. Says Savvas Gkantonas. App development by Pedrode Oliveira, Faculty of Engineering, Cambridge.
Researchers have quantified the important role of ventilation in the Covid-19 epidemic, and in poorly ventilated areas, the virus spreads more than 2 meters per second, far more likely to spread through longer conversations than coughing. I found it expensive. “We look at all aspects of aerosol and droplet propagation to understand, for example, the fluid dynamics associated with coughing and conversation,” said Professor Epaminodas Mastracos, also the lead author of research at the Faculty of Engineering.
“The role of turbulence and how it sinks due to gravity and affects droplets floating in the air is not particularly well understood.” These and other new results will be announced in the future. I hope it will also be implemented as an app safety factor. To investigate, “Mastrakos added.
Is your office Covid-secure? Free online tools can calculate the risk of spreading the virus in poorly ventilated areas, Health News, ET Health World
Source link Is your office Covid-secure? Free online tools can calculate the risk of spreading the virus in poorly ventilated areas, Health News, ET Health World