Open the windows while eating Christmas dinner: a simulation reveals how fresh air drains coronavirus particles into the dining room
- The simulation was made by experts from Hexagon Manufacturing Intelligence from Japan
- He looked at what was happening to the particles thrown out of the mouths of infected people
- Detecting window and door openings to improve ventilation has a significant impact on the number of infectious particles in a room
A shocking new video reveals the risks that people take on Christmas dinner with someone who lives in another household.
It shows how in a typical British dining room, coronavirus particles thrown out of someone’s mouth circulate and infect other people.
Experts from Hexagon Manufacturing Intelligence in Japan have built a model that shows the level of risk an asymptomatic person poses to other people at the table.
Engineers hope their simulation can help individuals and families assess the risk of interference during the holiday season.
The researchers worked on room dimensions of 4.9mx 3.7m (16ft x 12ft) and performed two versions of their simulation, with the room being closed without ventilation (left) and the other with two windows and an open door, ten each minute (right)
The researchers worked on room dimensions of 4.9mx 3.7m (16ft x 12ft) and performed two versions of their simulation, with the room closed without ventilation and the other with two windows and an open door, each for ten minutes.
In the videos, the researchers map the particles ejected from a person’s mouth during regular breathing and talking.
This causes a relatively pedestrian spread of the particles relative to coughing or sneezing.
‘Hexagon engineers in Japan created the simulation as part of a public education effort, to help authorities and the general public understand how best to protect themselves and each other from transmitting COVID-19,’ Keith Perrin, industry director for Hexagon, told MailOnline.
“Being Japanese, they were used to socially distancing themselves and carrying PPE when they were sick, so they were intrigued by other attitudes.”
The heat from the radiators, food and people sitting around the dinner table forces the particles towards the ceiling, but if there is not enough ventilation, they have nowhere to run and are forced to go back down and spin around the room.
However, if there is enough ventilation from open windows, the particles are almost immediately sucked in and separated from other people.
“Good ventilation is key – just make sure as many windows and doors are open as possible so that air circulates and particles don’t accumulate,” Mr Perrin said.
In the videos, researchers map particles ejected from a person’s mouth during regular breathing and talking. This causes a relatively pedestrian spread of the particles relative to coughing or sneezing
The heat from the radiators, food and people sitting around the dinner table forces the particles towards the ceiling, but if there is not enough ventilation, they have nowhere to run and are forced to go back down and spin around the room
If there is enough ventilation from open windows, infectious particles are almost immediately sucked in and away from other people.
‘Social distancing is important regardless of room ventilation, but it’s not safe – an unventilated simulation shows that the number of infected particles accumulates and travels over recommended distances of at least 2 m, so room airflow is very important to maximize social distancing efficiency. .
‘However, at the end of the segment there are some elements that compare the effect of an open window.’
He reveals that based on their calculations, an infected person in an unventilated room would continue to infect six more people.
However, in a ventilated average dining room statistically no one else would be infected.
‘This simple effort results in a significant statistical change.
‘To give you some idea, over three repetitions of transmission, assuming similar conditions, it’s mathematically 215 less infected people!’ He says.
‘Our studies show that the question is not’ whether ‘there will be a transfer, but the question of’ when ‘.’
The Hexagon team used their expertise throughout the pandemic to show people how invisible droplets and aerosols can spread without people knowing it.
One of their videos shows that choking sneezing with your elbow is better than not stopping at all, but it can still endanger people nearby.
Another visualization showed what can happen if a person does not wear a mask on a pipe or on a train.
How walking down a narrow hallway BEHIND an infected person increases the risk of catching Covid-19
Coronavirus particles ejected from a person’s uncovered mouth in a narrow space like a hallway can linger behind them for seconds, the study warns.
The discovery comes from computer simulations that show how particles behave after someone coughs them up to move forward.
Swirling air and vortices allow particles to float at waist height in the air up to 16 meters (five meters) behind the infected person, which poses significant problems for social distancing and increases the risk of infecting children.
Researchers from the Chinese Academy of Sciences in Beijing used as an example a 1.8 m (5 ft 11 inch) man walking at a speed of 1.5 m / s.
They modeled what would happen if he coughed, without a mask on his face, both in wide open spaces and in a narrow hallway.
Previous studies have focused almost exclusively on the spread of infectious particles in unrestricted places. This new research investigated how the behavior of particles differs if they are physically written.
They found that while walking indoors, droplets in the air carrying the deadly virus followed a certain pattern, called “separate mode.”
Computer visualization shows that particles fly behind a person with air currents that are created during walking, and a cloud of droplets separates from the body and creates a floating stain of infectious aerosols a few meters behind the individual.