Infectious cough droplet dynamics in a makeshift hospital isolation ward DOI
Leslie Kojo Norvihoho, Yi Liu, Jing Yin

et al.

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(2)

Published: Feb. 1, 2025

The COVID-19 pandemic highlighted the need for rapidly deployable healthcare facilities, leading to increased use of modular construction methods. Nonetheless, knowledge about airflow patterns and spread bioaerosols in these wards remains insufficient, potentially heightening risk cross-infection among workers patients. This paper presents a ventilation design negative-pressure ward aimed at reducing infectious particles. We investigate effects various designs, patient postures (sitting supine), air changes per hour (ACH) on cough droplets an airborne infection isolation room using large eddy simulation Eulerian–Lagrangian model. Findings show that ceiling exhaust grilles (design 2) resulted lowest radial dispersion (3.64 m) 12 ACH, while sidewall exhausts (baseline) performed best higher ACH levels. Seated patients had quicker droplet evaporation compared those supine position. setups survival included bed's bottom ceiling, maintaining minimum ACH. Cases 5 13, with over patient's head bottom, showed concentrations DPM, under 0.008 km−3 near source less than 0.001 mid-room. Sitting posture consistently led lower DPM concentrations. research emphasizes critical role placement re-circulation transmission risks, ultimately contributing improved strategies control AII rooms.

Language: Английский

Infectious cough droplet dynamics in a makeshift hospital isolation ward DOI
Leslie Kojo Norvihoho, Yi Liu, Jing Yin

et al.

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(2)

Published: Feb. 1, 2025

The COVID-19 pandemic highlighted the need for rapidly deployable healthcare facilities, leading to increased use of modular construction methods. Nonetheless, knowledge about airflow patterns and spread bioaerosols in these wards remains insufficient, potentially heightening risk cross-infection among workers patients. This paper presents a ventilation design negative-pressure ward aimed at reducing infectious particles. We investigate effects various designs, patient postures (sitting supine), air changes per hour (ACH) on cough droplets an airborne infection isolation room using large eddy simulation Eulerian–Lagrangian model. Findings show that ceiling exhaust grilles (design 2) resulted lowest radial dispersion (3.64 m) 12 ACH, while sidewall exhausts (baseline) performed best higher ACH levels. Seated patients had quicker droplet evaporation compared those supine position. setups survival included bed's bottom ceiling, maintaining minimum ACH. Cases 5 13, with over patient's head bottom, showed concentrations DPM, under 0.008 km−3 near source less than 0.001 mid-room. Sitting posture consistently led lower DPM concentrations. research emphasizes critical role placement re-circulation transmission risks, ultimately contributing improved strategies control AII rooms.

Language: Английский

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