Numerical assessment of ceiling-mounted air curtain on the particle distribution in surgical zone

Tan, Huiyi; Wong, Keng Yinn; Lee, Chew Tin; Wong, Syieluing; Nyakuma, Bemgba Bevan; Wahab, Roswanira Abdul; Lee, Kee Quen; Chiong, Meng Choung; Ho, Wai Shin; Othman, Mohd Hafiz Dzarfan; Yau, Yat Huang; Kek, Hong Yee; Kamar, Haslinda Mohamed

doi:10.1007/s10973-022-11466-6

Cited by 22 publications

(10 citation statements)

References 40 publications

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“…In CFD simulations, there is a trade-off between the precision of the model and the computational cost (i.e., time of the process, size of the file and memory requirement) [ 52 , 53 ]. In this study, which involved many simulations, physics-controlled mesh was created in coarse element size, which was considered sufficient for obtaining satisfactory results.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of a Novel Cuboid Hollow Fiber Hemodialyzer Design Using Computational Fluid Dynamics

Umatheva

Ghosh

2023

Membranes

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Conventional hollow fiber hemodialyzers have a cylindrical shell-and-tube design. Due to their circular cross-section and radial flow distribution and collection in the headers, the flow of blood in the header as well as in the hollow fiber membranes is non-uniform. The creation of high shear stress and high shear rate zones or stagnation zones could result in problems, such as cell lysis and blood clotting. In this paper, a novel cuboid hemodialyzer design is proposed as an alternative to the conventional cylindrical hemodialyzer. The primary motivation behind the proposed design is to create uniform flow conditions and thereby minimize some of the above-mentioned adverse effects. The most salient feature of the proposed design is a cuboid shell within which the hollow fiber membrane bundle is potted. The lumen of the fibers is fed from one side using a flow distributor consisting of embedded primary and secondary channels, while the fibers are drained from the other side using a flow collector, which also has embedded primary and secondary channels. The flow characteristics of the lumen side of the cuboid hemodialyzer were compared with those of a conventional hemodialyzer based on computational fluid dynamics (CFD) simulations. The results of CFD simulations clearly indicated that the flow of liquid within the cuboid dialyzer was significantly more uniform. Consequently, the shear rate and shear stress were also more uniform. By adopting this new design, some of the problems associated with the conventional hemodialyzer design could potentially be addressed.

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Section: Methodsmentioning

confidence: 99%

Evaluation of a Novel Cuboid Hollow Fiber Hemodialyzer Design Using Computational Fluid Dynamics

Umatheva

Ghosh

2023

Membranes

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“…In a CFD analysis, insufficient grid density could yield an under/over-predicted result [28]. To make sure that the numerical errors in the simulated results are insignificant, a grid-independent test (GIT) was carried out [29]. GIT is a method used to identify the ideal grid condition that contains the fewest grids while producing a converged and reliable simulated result.…”

Section: Grid Independence Testmentioning

confidence: 99%

“…According to our previous validation work, an RNG k-ε model was proven to be more reliable in predicting the indoor airflow velocities in low turbulence healthcare facilities [29], as compared to Reynolds-Averaged Navier-Stokes (RANS) models such as standard k-ε, realizable k-ε, and SST k-ω. The validation work shows a good agreement with previous studies, with a relative error of less than 10 % [11].…”

Section: Airflow Turbulence and Discrete Phase Modelsmentioning

confidence: 99%

A CFD assessment on ventilation strategies in mitigating healthcare-associated infection in single patient ward

Kek

Tan

Sheng

et al. 2023

PROGEE

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A promising ventilation strategy is an effective measure to enhance indoor air quality and protect the patients against healthcare-acquired infection. The Computational Fluid Dynamics (CFD) model represents a patient ward that was constructed using Computer-Aided Design (CAD) software. The simulated results were verified and validated based on the published data. A Renormalization Group (RNG) k-epsilon model based on the Eulerian approach was used to simulate the airflow turbulence, while a discrete phase model (DPM) based on the Lagrangian approach was used to predict the dispersion of airborne particles. This study examined four cases of ventilation strategies, with varying ventilation rates, positioning of supply air diffusers, and location of exhaust grilles. This study revealed that the installation of air curtain jet coupled with a ceiling-mounted air supply diffuser (case 3) above the patient-occupying zone has the highest wiping efficiency against the infectious particles. The utilization of ventilation strategy in case 3 managed to reduce the particle by approximately 3.3 times as compared to the baseline case. The study outcome also suggested that the exhaust grilles should be placed on the upper wall, to ensure a proper mixing of fresh air in the entire patient ward.

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“…However, the matter of debate remains due to the controversial findings of LAF or mixing ventilation in ensuring the sterility of OR. To maximize the ventilation performance and reduce the risk of surgical site infection, the concept of air curtain [63,64], wall-mounted horizontal LAF system [37] and mobile LAF unit [65][66][67][68] were integrated into OR. Hybrid ventilation systems including the temperature-controlled airflow (TAF) system which combined both LAF and turbulent mixing system were also developed in maintaining the air cleanliness in OR [69].…”

Section: Ventilation Strategies In Mitigating Airborne Infectionmentioning

confidence: 99%

Ventilation Strategies for Mitigating Airborne Infections in Healthcare Facilities: A Mini-Review and Bibliometric Analysis (1970 to 2021)

Saupi¹,

Kek²,

Tan³

et al. 2023

Preprint

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Over the years, researchers have been developing different ventilation strategies as a potential solution for controlling infectious airborne transmissions in healthcare facilities. The effects of ventilation systems on airflow characteristics have been extensively discussed among researchers since SARS-CoV-2 outbreak in 2019. Based on a bibliometric study of 154 publications from 1970 to 2021 retrieved from the Web of Science (WoS) database, this paper examines the research landscape on the effects of ventilation strategies on airflow analysis in healthcare facilities. Results show that China is the most productive country due to its significant contributions to the top prolific authors and funding agencies, which have promoted the research development of the topic. Several research hotspots were identified through keyword co-occurrence analysis. Cluster 1 highlights the ventilation studies involving ventilation layouts and ventilation rates in healthcare facilities. Cluster 2 underlines the computational analysis of ventilation performance for reducing the exposure risk of occupants, which promotes the development of infection control measures. Cluster 3 strengthens the knowledge of the emission and dispersion characteristics of respiratory droplets in healthcare facilities. Overall, this paper highlights the future direction of the current research field other than identifying strategic collaborators and suitable publication outlets for interested researchers.

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Numerical assessment of ceiling-mounted air curtain on the particle distribution in surgical zone

Cited by 22 publications

References 40 publications

Evaluation of a Novel Cuboid Hollow Fiber Hemodialyzer Design Using Computational Fluid Dynamics

Evaluation of a Novel Cuboid Hollow Fiber Hemodialyzer Design Using Computational Fluid Dynamics

A CFD assessment on ventilation strategies in mitigating healthcare-associated infection in single patient ward

Ventilation Strategies for Mitigating Airborne Infections in Healthcare Facilities: A Mini-Review and Bibliometric Analysis (1970 to 2021)

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