Airflow Study of A Closed Room in the Public Spaces and Mass Transportation for Healthy and Safe from The Transmission of Covid19

We present engineering airflow to intercept the transmission of Covid19 in public spaces and transportations, which relatively fast simple. This technique is suppress effectively as massive possible spread aerosols droplets contaminated with COVID-19 virus that flying air by providing a vertical downward flow using fans placed on ceilings use floors certain material so aerosol microdroplets will not bounce back up, difficult roll, firmly attached floor. The numerical simulation shows positioning fan ceiling room cause particle move faster downward, push fall floor more quickly, quickly away from most risk organs transmission, namely mouth nose. contactangle test results several materials always show value fewer than 90 degrees. These phenomena or stick tightly easily roll. phenomenon be sterile may Covid19. healthier safer. can solution inexpensive simple implement field scale very effective reducing radius closed spaces, both transportation, such trains city buses are susceptible transmission.