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Hydrodynamic analysis of the advancing dynamic contact angle in microtube

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Abstract

We explored the hydrodynamic features of dynamic wetting both theoretically and experimentally. We studied the triple-line motions of glycerol-water solutions of various viscosities (85-456 mPa·s) in microglass tubes (300, 500 and 1000 μm in diameter). First, dynamic (advancing) contact angles were measured and compared with those of a well-known hydrodynamic model (O.V. Voinov, Hydrodynamics of Wetting, Fluid Dynamics (1976)). Second, the internal flow structures near moving menisci were visualized using micro-particle image velocimetry (μ-PIV). Several differences in flow shape (compared to those predicted by theory) were observed. Ultimately, we present a new method by which dynamic contact angles may be predicted, derived from analysis of wall shearing stress at the moving contact line to reflect on the liquid-solid interaction effect. Our analysis has the advantage of incorporating the effect of contact angle hysteresis on the dynamic contact angle. The modified approach yielded data in good agreement with our experimental results and other open-literature data. We thus fundamentally explored the hydrodynamic aspects of dynamic wetting.

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Authors and Affiliations

  1. Research Center for Heat and Mass Transfer, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, 100190, China

    Seol Ha Kim, Tao Wang, Lei Zhang & Yuyan Jiang

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Tao Wang, Lei Zhang & Yuyan Jiang

Authors
  1. Seol Ha Kim
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  2. Tao Wang
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  3. Lei Zhang
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  4. Yuyan Jiang
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Corresponding authors

Correspondence to Tao Wang or Yuyan Jiang.

Additional information

Recommended by Associate Editor Hyoung-Bum Kim

Kim, SeolHa graduated from POSTECH (South Korea) for Bachelor & Master degree (Mechanical engineering) and Doctor degree (Nuclear engineering). He worked in Korea Atomic Energy Research Institute for Post doctor researcher, studying the thermal hydraulics in nuclear engineering safety issues. Currently, He is working in CAS, IET, China, researching about fundamental phenomena in triple line of multiphase flow system.

Wang Tao graduated from UCAS (China) for Doctor degree in Thermophysics Engineering and worked in CAS, IET for Post doctor researcher. He had numerous research experience about phase change heat transfer under experimental work. Currently, He is working at the CAS, IET as an Associate Professor.

Jiang Yuyan graduated from Xi’an Jiaotong University for Bachelor, Tsinghua University (China) for Master and Tokyo University (Japan) for Doctor degree in Mechanical engineering field. Currently, he is working about various thermal engineering research projects at the CAS, IET as a Full Professor.

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Kim, S.H., Wang, T., Zhang, L. et al. Hydrodynamic analysis of the advancing dynamic contact angle in microtube. J Mech Sci Technol 32, 5305–5314 (2018). https://doi.org/10.1007/s12206-018-1029-4

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  • DOI: https://doi.org/10.1007/s12206-018-1029-4

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