The Effect of the Reynolds Number of Air Flow to the Particle Collection Efficiency of a Fibrous Filter Medium With Cylindrical Section

Kouropoulos, Giorgos P.

doi:10.4090/juee.2014.v8n1.003010

Cited by 8 publications

(5 citation statements)

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“…s), we expected and confirmed that actual outflow rates are much lower. This is due to very high Reynolds number for high air flow rate indicating non-laminar flow and increases in Mach number at higher pressures due to compressible air [33][34][35] . Flow rate saturates for each tubing configuration at approximately 200 mmHg vacuum (Fig.…”

Section: Discussionmentioning

confidence: 99%

A novel box for aerosol and droplet guarding and evacuation in respiratory infection (BADGER) for COVID-19 and future outbreaks

Novak

Janek

et al. 2021

Sci Rep

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The coronavirus disease 2019 (COVID-19) pandemic caused by the severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) has infected millions and killed more than 1.7 million people worldwide as of December 2020. Healthcare providers are at increased risk of infection when caring for patients with COVID-19. The mechanism of transmission of SARS-CoV-2 is beginning to emerge as airborne spread in addition to direct droplet and indirect contact as main routes of transmission. Here, we report on the design, construction, and testing of the BADGER (Box for Aerosol and Droplet Guarding and Evacuation in Respiratory Infection), an affordable, scalable device that contains droplets and aerosol particles, thus minimizing the risk of infection to healthcare providers. A semi-sealed environment is created inside the BADGER, which is placed over the head of the patient and maintains at least 12-air changes per hour using in-wall vacuum suction. Multiple hand-ports enable healthcare providers to perform essential tasks on a patient’s airway and head. Overall, the BADGER has the potential to contain large droplets and small airborne particles as demonstrated by simulated qualitative and quantitative assessments to provide an additional layer of protection for healthcare providers treating COVID-19 and future respiratory contagions.

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Section: Discussionmentioning

confidence: 99%

A novel box for aerosol and droplet guarding and evacuation in respiratory infection (BADGER) for COVID-19 and future outbreaks

Novak

Janek

et al. 2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…This is due to very high Reynolds number for high air flow rate indicating non-laminar flow and increases in Mach number at higher pressures due to compressible air. 26,33,34 Flow rate saturates for each tubing configuration at approximately 200 mmHg vacuum (Figure 5A) indicating higher order compressibility and turbulent flow effects, which are not modeled by Hagen-Poiseuille, influence the response. In our experience, the mixed setup (2 HEPA filters, 1.8 m of ventilator tubing and 3.2 m of 7 mm diameter suction tubing) would provide good balance between outflow rate, filter efficiency and easy of setup.…”

Section: Discussionmentioning

confidence: 99%

A Novel Box for Aerosol and Droplet Guarding and Evacuation in Respiratory Infection (BADGER) for COVID-19 and Future Outbreaks

Novak

Janek

et al. 2020

Preprint

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The coronavirus disease 2019 pandemic caused by the severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) has infected millions and killed hundreds of thousands of people worldwide as of May 2020. Healthcare providers are at increased risks of infection when caring for patients with COVID-19. The mechanism of transmission of SARS-CoV-2 is still not fully understood. However, there is growing evidence for airborne spread, in addition to direct droplet and indirect contact. Here, we report on the design, construction, and testing of the BADGER (Box for Aerosol and Droplet Guarding and Evacuation in Respiratory Infection), an affordable, scalable device that contains droplets and aerosol particles. A semi-sealed environment is created inside the BADGER, which maintains at least twelve-air changes per hour using in-wall vacuum suction, and multiple hand-ports enable healthcare providers to perform essential tasks on a patient's airway and head. Overall, the BADGER has the potential to contain large droplets and small airborne particles as demonstrated by simulated qualitative and quantitative assessments to provide an additional layer of protection for healthcare providers treating COVID-19 patients.

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“…The dynamics of aerosol particles must be understood in order to apply a filtration model. It is worth noting that filters are primarily designed for laminar airflow which is indicated by a relatively low Reynolds number of less than 2000 [40].…”

Section: Data Availability Statementmentioning

confidence: 99%

Digital Twin Geometry for Fibrous Air Filtration Media

Beckman

Berry

Cho

et al. 2021

Fibers

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Computational modeling of air filtration is possible by replicating nonwoven nanofibrous meltblown or electrospun filter media with digital representative geometry. This article presents a methodology to create and modify randomly generated fiber geometry intended as a digital twin replica of fibrous filtration media. Digital twin replicas of meltblown and electrospun filter media are created using Python scripting and Ansys SpaceClaim. The effect of fiber stiffness, represented by a fiber relaxation slope, is analyzed in relation to resulting filter solid volume fraction and thickness. Contemporary air filtration media may also be effectively modeled analytically and tested experimentally in order to yield valuable information on critical characteristics, such as overall resistance to airflow and particle capture efficiency. An application of the Single Fiber Efficiency model is incorporated in this work to illustrate the estimation of performance for the generated media with an analytical model. The resulting digital twin fibrous geometry compares well with SEM imagery of fibrous filter materials. This article concludes by suggesting adaptation of the methodology to replicate digital twins of other nonwoven fiber mesh applications for computational modeling, such as fiber reinforced additive manufacturing and composite materials.

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The Effect of the Reynolds Number of Air Flow to the Particle Collection Efficiency of a Fibrous Filter Medium With Cylindrical Section

Cited by 8 publications

References 1 publication

A novel box for aerosol and droplet guarding and evacuation in respiratory infection (BADGER) for COVID-19 and future outbreaks

A novel box for aerosol and droplet guarding and evacuation in respiratory infection (BADGER) for COVID-19 and future outbreaks

A Novel Box for Aerosol and Droplet Guarding and Evacuation in Respiratory Infection (BADGER) for COVID-19 and Future Outbreaks

Digital Twin Geometry for Fibrous Air Filtration Media

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