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http://dx.doi.org/10.9713/kcer.2022.60.2.282

Microdroplet Impact Dynamics at Very High Velocity on Face Masks for COVID-19 Protection  

Choi, Jaewon (School of Mechanical Engineering, Soongsil University)
Lee, Dongho (School of Mechanical Engineering, Soongsil University)
Eo, Jisu (School of Mechanical Engineering, Soongsil University)
Lee, Dong-Geun (School of Mechanical Engineering, Soongsil University)
Kang, Jeon-Woong (School of Mechanical Engineering, Soongsil University)
Ji, Inseo (School of Mechanical Engineering, Soongsil University)
Kim, Taeyung (School of Mechanical Engineering, Soongsil University)
Hong, Jiwoo (School of Mechanical Engineering, Soongsil University)
Publication Information
Korean Chemical Engineering Research / v.60, no.2, 2022 , pp. 282-288 More about this Journal
Abstract
Facial masks have become indispensable in daily life to prevent infection and spread through respiratory droplets in the era of the corona pandemic. To understand how effective two different types of masks (i.e., KF-94 mask and dental mask) are in blocking respiratory droplets, i) we preferentially analyze wettability characteristics (e.g., contact angle and contact angle hysteresis) of filters consisting of each mask, and ii) subsequently observe the dynamic behaviors of microdroplets impacting at high velocities on the filter surfaces. Different wetting properties (i.e., hydrophobicity and hydrophilicity) are found to exhibit depending on the constituent materials and pore sizes of each filter. In addition, the pneumatic conditions for stably and uniformly dispensing microdroplets with a certain volume and impacting behaviors associated with the impacting velocity and filter type change are systematically explored. Three distinctive dynamics (i.e., no penetration, capture, and penetration) after droplet impacting are observed depending on the type of filter constituting the masks and droplet impact velocity. The present experimental results not only provide very useful information in designing of face masks for prevention of transmission of infectious respiratory diseases, but also are helpful for academic researches on droplet impacts on various porous surfaces.
Keywords
Facial masks; Corona pandemic; Droplet impacts; Hydrophobicity; Hydrophilicity;
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