Because of the COVID-19, the world has been affected significantly. Not only health and
medical problems but also the decline in life quality and economic activity due to the
suspension of social activities cannot be disregarded. It is assumed that the virus is
transmitted through coughing and sneezing; however, the possibility of airborne infection
by aerosols containing viruses scattered in the air has become a popular topic recently.
In airborne infections, the risk of infection increases when the mucous membrane is
exposed to exhaled aerosols for a significant amount of time. Therefore, in this study, we
visualize human breath using the smoke of electronic cigarettes as tracer particles.
Exhalation when speaking was visualized for four human posture patterns. The result shows
that the exhaled breath is affected by the body wall temperature; it rises when it remains
in the boundary layer by wearing a mask. On the other hand, without a mask, it initially
flows downward due to the structure of the nose and mouth, so it flows downward due to
inertia and diffuses randomly. This finding is effective in reducing the risk of infection
during face-to-face customer service.
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