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2020.08.12
News

A Clear Picture of Face Mask Airflow to Help Combat Covid-19

A group of researchers including Prof. Itsuro Honda, Prof. Osamu Kawanami, and Asst. Prof. Naohisa Takagaki of the University of Hyogo Graduate School of Engineering has harnessed visualization techniques and the principles of fluid mechanics to map the flow of air in the vicinity of a face mask. In doing so, the group seeks to satisfy the public demand for knowledge regarding the effectiveness of face masks in preventing infection as people around the world are being encouraged to wear them in response to the global outbreak of Covid-19. There is, however, no agreement on the “scientifically correct” way to wear a mask.

Because airborne droplets and viruses are spread and inhaled via breath, this study focused on the airflow in the area of the mouth when breathing. The team used lasers to make the airflow visible in order to investigate in detail the differences when wearing and not wearing a face mask.

As a result of successfully making the airflow visible, the study confirmed that exhaled air emerges like a jet when a mask is not worn, and revealed that masks—made of both woven and non-woven cloth—prevent this jet-like eruption of air.

See how breath causes air to flow through YouTube; turn on closed-caption subtitles for English.

It is hoped that the information generated through this study will prove relevant for public health purposes, and contribute to the industrial community in the form of support for mask development.