  We show that enhanced turbulent mixing can be used to mitigate airborne
COVID-19 transmission by dispersing virus-laden clouds in enclosed, poorly
ventilated spaces. A simple system of fan-driven turbulent jets is designed so
as to minimize peak concentrations of passive contaminants on time scales short
compared to the room ventilation time. Standard Reynolds-average and similarity
methods are used, and combinations of circular and radial wall jets are
considered. The turbulent diffusivity and contaminant mixing time are
calculated. Results indicate that this approach can significantly reduce peak
virus cloud concentrations, especially in small spaces with low occupancy, such
as restrooms. Turbulent mixing is, of course, ineffective in the absence of
ventilation.
