COVID-19: Mask prevents splash spread: Predicted at Fugaku
COVID-19:
Kobe University: RIKEN Team
To reduce the risk of COVID-19 infection, we are investigating the diffusion routes of droplets in daily life.
On August 24, it was shown that “a handmade cloth mask also has the effect of preventing splash spread”.
Supercomputer “Togaku” is used for research.
Calculate how the splash spreads:
A non-woven mask and a hand-made cloth mask are used to calculate and compare how the droplets spread when coughing.
Cloth masks are inferior to non-woven masks, but it was found that 70 to 80% of them can catch droplets.
KYODO communication
https://this.kiji.is/670560002694349921
Simulate how flight spreads
RIKEN research group newly announced on August 17th.
There are four types of simulation videos in total.
1. 4 people in the office
In either case, the flight distance is about 2 meters, and it will affect the person in front.
On the other hand, also found that it hardly affected people next to me or diagonally in front.
2. 18 people at the office
“Turning on the air conditioner to create a temperature difference from the outside” is important for ventilation.
3. Hospital room
We found that if the air conditioner was turned on and the window was opened, the spread flight would fade in a short time.
Analyzed that thorough ventilation is effective to prevent nosocomial infections.
4. Train
We found that if the car is vacant, “the effect of ventilation will be three times that of ordinary offices”.
When crowded on a crowded train, it means that the air flow is uneven, and there is insufficient ventilation.
https://www3.nhk.or.jp/news/html/20200617/k10012473941000.html