PNAS: Speech can produce jet-like transport relevant to asymptomatic spreading of virus

PNAS: Speech can produce jet-like transport relevant to asymptomatic spreading of virus. “Medical reports and news sources raise the possibility that flows created during breathing, speaking, laughing, singing, or exercise could be the means by which asymptomatic individuals contribute to spread of the SARS-CoV-2 virus. We use experiments and simulations to quantify how exhaled air is transported in speech. Phonetic characteristics introduce complexity to the airflow dynamics and plosive sounds, such as ‘P,’ produce intense vortical structures that behave like ‘puffs’ and rapidly reach 1 m. However, speech, corresponding to a train of such puffs, creates a conical, turbulent, jet-like flow and easily produces directed transport over 2 m in 30 s of conversation. This work should inform public health guidance for risk reduction and mitigation strategies of airborne pathogen transmission.”

MIT Technology Review: Loud talking could leave coronavirus in the air for up to 14 minutes

MIT Technology Review: Loud talking could leave coronavirus in the air for up to 14 minutes. “Thousands of droplets from the mouths of people who are talking loudly can stay in the air for between eight and 14 minutes before disappearing, according to a new study. The research, conducted by a team with the US National Institutes of Health and published in PNAS Wednesday, could have significant impact on our understanding of covid-19 transmission.”