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A novel reusable anti-COVID-19 transparent face respirator with optimized airflow

Alenezi, H; Cam, ME; Edirisinghe, M; (2020) A novel reusable anti-COVID-19 transparent face respirator with optimized airflow. Bio-Design and Manufacturing pp. 1-9. 10.1007/s42242-020-00097-1. (In press). Green open access

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Abstract

This novel face mask is designed to be a reusable respirator with a small and highly efficient disposable fabric filter. Respirator material requirements are reduced by 75% compared to traditional designs and allow repeated cleaning or sterilization. The probability of virus particle inhalation is reduced using novel air filtration pathways, through square-waveform design to increase filter airflow. Air enters the mask from right and left side filters, while the area in front of the mouth is isolated. Clear epoxy is used for a transparent frame, allowing lip-reading, and mask edges contain a silicone seal preventing bypass of the filters. The mask is manufactured using silicone molds, eliminating electricity requirements making it economical and viable in developing countries. Computational fluid dynamics numerical studies and Fluent ANSYS software were used to simulate airflow through the filter to optimize filter air path geometry and validate mask design with realistic human requirements. The breathing cycle was represented as a transient function, and N95 filter specifications were selected as a porous medium. The novel design achieved 1.2 × 10-3 kg s-1, 20% higher than human requirements, with air streamlines velocity indicating local high speed, forcing and trapping virus particles against filter walls through centrifugal forces.

Type: Article
Title: A novel reusable anti-COVID-19 transparent face respirator with optimized airflow
Location: Singapore
Open access status: An open access version is available from UCL Discovery
DOI: 10.1007/s42242-020-00097-1
Publisher version: https://doi.org/10.1007/s42242-020-00097-1
Language: English
Additional information: © 2020 Springer Nature Switzerland AG. This article is licensed under a Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/).
Keywords: COVID-19, Flow, Mask, Pressure, Prototype, Temperature
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10111430
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