Findings in this study, by researchers at the Indian Institute of Technology Bhubaneswar, show the need for new mask designs that reduce side and bottom droplet leakage and good ventilation systems that take into account the aerosolized particle leakage that occurs with breathing and normal conversation as a way to reduce the spread of COVID-19 in enclosed spaces.
In an experimental setup, researchers connected a mechanical breathing simulator to a 5 foot 8 inch mannequin, and they filled a fog generator with water and glycerin to emulate saliva droplets. Droplet exposure was illuminated and captured by video camera.
Among the findings:
The researchers say the findings show that social distancing is equally important as mask wearing when people indoors are just breathing or participating in normal conversation. The findings also show the need for good ventilation systems that take into account the 5% to 10% of aerosolized particle leakage that occurs when just breathing as a way to reduce droplet concentration in enclosed spaces.
The researchers note that the noticeable droplets settling below the face shield is concerning, and pairing surgical masks with shields is not adequate in hospitals and other places where strict social distancing guidelines are difficult to follow.Read More >>