Inhalability of micro-particles through the human nose breathing at high free-stream airflow velocities

Naseri, Arash; Emdad, Homayoun; Mehrabi, Samrad; Sadrizadeh, Sasan; Abouali, Omid

doi:10.1016/j.buildenv.2020.106948

Cited by 3 publications

(2 citation statements)

References 48 publications

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“…When a person speaks, breathes, coughs, or sneezes, droplets are released by the respiratory system [ [14], [15]]. These droplets can transport infections and cause infectious diseases in people because of their wide size distribution.…”

Section: Introductionmentioning

confidence: 99%

Can Airflow Manipulation Disrupt the Transmission of COVID-19 Variants and Highly Infectious Droplets?

Saad,

Hassan,

Hanafy

et al. 2024

Preprint

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In the ongoing battle against new variants of COVID-19 and airborne-transmitted diseases, the focus on indoor air quality, particularly in enclosed spaces, has intensified. This study utilizes computational fluid dynamics (CFD) modelling to investigate how different air distribution setups can impact the spread of airborne COVID-19 particles. Air distribution systems are at the forefront of this research, specifically examining supply and exhaust diffuser placements and their effects on droplet dispersion dynamics. Results reveal a promising reduction (10–21%) in residual droplet mass over a 10-second period when exhaust diffusers are strategically located above cough sources. This underscores the pivotal role of ventilation design in curbing airborne transmission. Furthermore, the analysis sheds light on variations (2.7–8.9%) in droplet Sauter mean diameter across different configurations, underscoring the significance of airflow patterns in dictating droplet size distribution and infection control efficacy. The study also emphasizes the importance of maintaining social distancing measures, showcasing a substantial decrease (82–89%) in viral concentration at a 2-meter distance, despite ventilation imperfections. In summary, this study highlights the critical role of ventilation design in combating airborne COVID-19 transmission within office environments. These findings offer valuable insights into optimizing airflow patterns, enhancing overall safety measures, and informing effective strategies to tackle the pandemic.

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Section: Introductionmentioning

confidence: 99%

Can Airflow Manipulation Disrupt the Transmission of COVID-19 Variants and Highly Infectious Droplets?

Saad,

Hassan,

Hanafy

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…Airborne transmission diseases can spread via released droplets from the human respiratory system. These droplets transfer during speaking, breathing, sneezing, and coughing [ 1 , 2 ]. Due to evaporation, these water droplets can have various size distributions [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Reducing the risk of viral contamination during the coronavirus pandemic by using a protective curtain in the operating room

Sadeghian

Cao

et al. 2022

Patient Saf Surg

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Background Airborne transmission diseases can transfer long and short distances via sneezing, coughing, and breathing. These airborne repertory particles can convert to aerosol particles and travel with airflow. During the Coronavirus disease 2019 (COVID-19) pandemic, many surgeries have been delayed, increasing the demand for establishing a clean environment for both patient and surgical team in the operating room. Methods This study aims to investigate the hypothesis of implementing a protective curtain to reduce the transmission of infectious contamination in the surgical microenvironment of an operating room. In this regard, the spread of an airborne transmission disease from the patient was evaluated, consequently, the exposure level of the surgical team. In the first part of this study, a mock surgical experiment was established in the operating room of an academic medical center in Norway. In the second part, the computational fluid dynamic technique was performed to investigate the spread of airborne infectious diseases. Furthermore, the field measurement was used to validate the numerical model and guarantee the accuracy of the applied numerical models. Results The results showed that the airborne infectious agents reached the breathing zone of the surgeons. However, using a protective curtain to separate the microenvironment between the head and lower body of the patient resulted in a 75% reduction in the spread of the virus to the breathing zone of the surgeons. The experimental results showed a surface temperature of 40 ˚C, which was about a 20 ˚C increase in temperature, at the wound area using a high intensity of the LED surgical lamps. Consequently, this temperature increase can raise the patient's thermal injury risk. Conclusion The novel method of using a protective curtain can increase the safety of the surgical team during the surgery with a COVID-19 patient in the operating room.

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Aspiration efficiency and respiratory tract deposition of indoor suspended micro-particles during steady and transient breathings

Kuga,

Kizuka,

Abouelhamd

et al. 2024

Building and Environment

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Inhalability of micro-particles through the human nose breathing at high free-stream airflow velocities

Cited by 3 publications

References 48 publications

Can Airflow Manipulation Disrupt the Transmission of COVID-19 Variants and Highly Infectious Droplets?

Can Airflow Manipulation Disrupt the Transmission of COVID-19 Variants and Highly Infectious Droplets?

Reducing the risk of viral contamination during the coronavirus pandemic by using a protective curtain in the operating room

Aspiration efficiency and respiratory tract deposition of indoor suspended micro-particles during steady and transient breathings

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