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Parametric study of the wetting transition of a moving meniscus

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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 μ-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.

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Acknowledgments

This work was a part of a project entitled “Three-Dimensional Cloaking Meta-Materials by Developing Super-Fine Patterning Nano-Inkjet Technology”, funded by the National Research Foundation of Korea (NRF-2015R1A2A1A05001829) and was part of a project entitled “Core Technology Development for Hybrid Power Generation Based on Tidal Current Energy” funded by the Korea Institute of Ocean Science and Technology (PE99421). The authors thank Prof. Jongin Hong at Chung-Ang University for providing the information of the fabrication processes. The authors also thank Mr. Patrick Comiskey at the University of Illinois at Chicago for the valuable comments of this work.

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Authors and Affiliations

  1. Korea Institute of Ocean Science and Technology, Ansan, 15627, Republic of Korea

    Jihoon Kim & Jin Hwan Ko

  2. Sungkyunkwan University, Suwon, 16419, Republic of Korea

    Jaehyun Lee & Doyoung Byun

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  1. Jihoon Kim
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  2. Jin Hwan Ko
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  3. Jaehyun Lee
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  4. Doyoung Byun
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Correspondence to Jin Hwan Ko or Doyoung Byun.

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Kim, J., Ko, J.H., Lee, J. et al. Parametric study of the wetting transition of a moving meniscus. J Vis 20, 111–123 (2017). https://doi.org/10.1007/s12650-016-0385-3

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