Parametric study of the wetting transition of a moving meniscus SCIE SCOPUS

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Title
Parametric study of the wetting transition of a moving meniscus
Author(s)
Kim, Jihoon; Ko, Jin Hwan; Lee, Jaehyun; Byun, Doyoung
Publication Year
2017-02
Abstract
In this study, we investigated the wetting transition of a moving meniscus in a grooved microchannel through a detailed parametric study based on measurement by an optical tool and mu-particle image velocimetry (PIV) to avoid the transition in designing the microchannel. The parameters investigated were pitch, flow rate, and height of a microchannel. The contact angle, contact speed, and interfacial pressure difference were analyzed according to the parameters. We found that the pitch is most effective, the flow rate is moderately effective, and the height is least effective on that. The height even does not affect the contact angle, because the solid-fluid interaction at the groove edge is stronger than the fluid-air interaction. As the critical correlation, the contact angle, which is dependent on the pitch and the flow rate, and the height affect the air pressure between the grooves, which governs the air penetration flux and mainly determines the wetting transition. Therefore, a powerful way to delay the wetting transition is to reduce the degree of air pressure variation, specifically with a low pitch and a tall height with a low flow rate. Eventually, understanding dominant input parameters in relation to the wetting transition will be very useful in the design stage of microfluidic applications.
ISSN
1343-8875
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/2265
DOI
10.1007/s12650-016-0385-3
Bibliographic Citation
JOURNAL OF VISUALIZATION, v.20, no.1, pp.111 - 123, 2017
Publisher
SPRINGER
Subject
PARTICLE IMAGE VELOCIMETRY; SUPERHYDROPHOBIC SURFACES; ELECTROOSMOTIC FLOW; MICROFLUIDIC DEVICES; SLIP-FLOW; MICROCHANNELS; PERMEATION; SIMULATION; PDMS; POLY(DIMETHYLSILOXANE)
Keywords
Parametric analysis; Wetting transition; Moving meniscus; Grooved microchannel; Air penetration flux
Type
Article
Language
English
Document Type
Article
Publisher
SPRINGER
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