Hydrodynamic analysis of the advancing dynamic contact angle in microtube

다국어 초록 (Multilingual 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.

참고문헌 (Reference)

1 H. K. Moffatt, "Viscous and resistive eddies near a sharp corner" 18 : 1-18, 1964

2 S. H. Kim, "The role of surface energy in heterogeneous bubble growth on ideal surface" 108 : 1901-1909, 2017

3 T. D. Blake, "The physics of moving wetting lines" 299 (299): 1-13, 2006

4 Y. D. Shikmurzaev, "The moving contact line on a smooth solid surface" 19 (19): 589-610, 1993

5 A. M. Barajas, "The effects of contact angle on two-phase flow in capillary tubes" 19 (19): 337-346, 1993

6 R. G. Cox, "The dynamics of the spreading of liquids on a solid surface" 168 : 169-194, 1986

7 C. W. Choi, "Surface wettability effect on flow pattern and pressure drop in adiabatic twophase flows in rectangular microchannel with T-junction mixer" 35 (35): 1086-1096, 2011

8 Y. Yamamoto, "Modeling of the dynamic wetting behavior in a capillary tube considering the macroscopic-microscopic contact angle relation and generalized Naiver boundary condition" 59 : 106-112, 2014

9 T. D. Blake, "Kinetics of liquid/liquid displacement" 30 (30): 421-423, 1969

10 C. Y. Lee, "Influence of surface wettability on transition of two-phase flow pattern in round mini-channels" 34 (34): 706-711, 2008

11 Voinov, "Hydrodynamics of wetting" 11 : 714-721, 1976

12 C. Huh, "Hydrodynamic model of steady movement of solid/liquid/fluid contact line" 35 (35): 85-101, 1971

13 J. D. Zimmerman, "High resolution measurements near a moving contact line using micro-PIV" Portland State University 2011

14 J. Y. Zhu, "Forced wetting dynamics of sodium dodecyl sulfate glycerol solution on solid substrates" 34 (34): 2286-2296, 2013

15 C. W. Choi, "Flow boiling behaviors in hydrophilic and hydrophobic microchannels" 35 (35): 816-824, 2011

16 M. Heshmati, "Experimental investigation of dynamic contact angle and capillary rise in tubes with circular and noncircular cross sections" 30 (30): 14151-14162, 2014

17 Z. Q. Liu, "Experiment research into the relationship between consistence and viscosity coefficient of glycerol (Chinese)" 24 (24): 58-59, 2005

18 F. Heslot, "Experiment on wetting on the scale of nanometers: Influence of the surface energy" 65 (65): 599-602, 1990

19 M. de Ruijter, "Effect of temperature on the dynamics contact angle" 144 : 235-243, 1998

20 Y. Deendarlianto, "Effect of static angle on the droplet dynamics during the evaporation of a water droplet on the hot walls" 71 : 691-705, 2014

21 J. G. Petrov, "Dynamics of partial wetting and dewetting in well-defined systems" 107 (107): 1634-1645, 2003

22 F. Brochard-Wyart, "Dynamics of partial wetting" 39 : 1-11, 1992

23 S. R. Ranabothu, "Dynamic wetting:Hydrodynamic or Molecular-kinetic?" 288 (288): 213-221, 2005

24 T. D. Blake, "Dynamic wetting by liquids of different viscosity" 253 (253): 196-202, 2002

25 K. Katoh, "Dynamic wetting behavior of a triple phase contact line in several experimental systems" 60 : 354-360, 2015

26 X. Wang, "Dynamic wetting and stress singularity on contact line" 46 (46): 407-417, 2003

27 M. Schneemilch, "Dynamic wetting and dewetting of a low-energy surface by pure liquids" 14 (14): 7047-7051, 1998

28 B. J. Zhang, "Dropwise steam condensation on various hydrophobic surfaces:Polyphenylene sulfide (PPS), polytetrafluoroethyele (PTFE), and self-assembled mcro/nano silver (SAMS)" 89 : 353-358, 2015

29 L. Chen, "Convex nanobending at a moving contact line: The missing mescopic link in dynamic wetting" 8 (8): 11493-11498, 2014

30 M. J. de Ruijter, "Contact angle relaxation during the spreading of partially wetting drops" 13 (13): 7293-7298, 1997

31 R. L. Hoffmann, "A study of advancing interface 1. Interface shape in liquid-gas systems" 50 (50): 228-241, 1975

32 P. G. Petrov, "A combined molecularhydrodynamic approach to wetting kinetics" 8 (8): 1762-1767, 1992