Numerical and experimental study of aerosol dispersion in the Do728 aircraft cabin
Level 5 - mechanism / opinion, no new human data
Level 5 by design analogy; non-clinical experimental mock-up with thermal manikins and computational fluid dynamics simulations.
OpenAlex W4320913398 · doi:10.1007/s13272-023-00644-3
What was done
Researchers evaluated aerosol dispersion from a single index passenger in a Dornier 728 aircraft cabin using an aerosol-exhaling thermal manikin combined with steady and unsteady Reynolds-averaged Navier-Stokes (RANS/URANS) computational fluid dynamics simulations. They tested standard mixing ventilation (MV) against alternative floor-based cabin displacement ventilation (CDV), examining the effects of passenger seating position (standing vs. seated), mask wearing, and increased airflow rates.
What was found
Under mixing ventilation, the volume ratio of inhaled to exhaled aerosol particles dropped below 0.06% at distances greater than two seat rows from the source, though exposure was higher within the same row. Standing index passengers produced weaker dispersion than seated ones. Combining mask wearing with increased airflow rates reduced aerosol dispersion over distance. RANS simulations indicated that floor-based displacement ventilation reduced aerosol spreading distances and cabin dwell times compared to mixing ventilation, and URANS simulations showed that breath momentum decay and evaporation occurred within a few seconds.
Why it matters
This study quantifies spatial exposure risks in airplane cabins and shows that targeted ventilation concepts (such as displacement ventilation) paired with masks significantly limit the longitudinal spread of infectious aerosols.
Limits
The study was conducted in a specific aircraft mock-up (Do728) using static thermal manikins and computer simulations, lacking live human passenger movement, variable breathing or coughing dynamics, and real-world passenger interactions. Exact numerical values for displacement ventilation and mask filtration efficacy were not detailed in the abstract.
Cited by
- supports Commercial airplanes exchange cabin air roughly tenfold per hour and pass the air through HEPA filters to capture viral particles.