Effect of a triple contact line on the thermokinetics of dropwise condensation on an immiscible liquid surface

RSC Advances ◽  
2016 ◽  
Vol 6 (47) ◽  
pp. 41506-41515 ◽  
Author(s):  
Sanat Kumar Singha ◽  
Prasanta Kumar Das ◽  
Biswajit Maiti
Keyword(s):  
Contact Line ◽  
Liquid Surface ◽  
Molecular Transport ◽  
Line Tension ◽  
Immiscible Liquid ◽  
Dropwise Condensation ◽  
Collective Influence

An extended thermokinetic model is developed for liquid-substrate-induced condensation by considering the collective influence of the line tension and the two mechanisms of molecular transport.

Test of the stability of a three-phase contact line with negative line tension

1999 ◽  
Vol 96 (9) ◽  
pp. 1335-1339 ◽  
Author(s):  
ALAN E. VAN GIESSEN, DIRK JAN BUKMAN, B.
Keyword(s):  
Contact Line ◽  
Line Tension ◽  
Phase Contact ◽  
Three Phase ◽  
The Stability

Contact Line Pinning Effects Influence Determination of the Line Tension of Droplets Adsorbed on Substrates

2018 ◽  
Vol 122 (30) ◽  
pp. 17184-17189 ◽  
Author(s):  
Hongguang Zhang ◽  
Shan Chen ◽  
Zhenjiang Guo ◽  
Yawei Liu ◽  
Fernando Bresme ◽  
...  
Keyword(s):  
Contact Line ◽  
Line Tension ◽  
Contact Line Pinning

Resistant Energy Analysis of Dropwise Condensation on Superhydrophobic Surfaces With Hierarchical Roughness

2017 ◽  
Author(s):  
Jiangtao Cheng
Keyword(s):  
Contact Line ◽  
Growth Dynamics ◽  
Adhesion Energy ◽  
Superhydrophobic Surfaces ◽  
Dropwise Condensation ◽  
Textured Surfaces ◽  
Biomimetic Surfaces ◽  
Molecular Kinetic Theory ◽  
Submicron Scale ◽  
Second Tier

Recently there have appeared multiscale lotus-leaf-like superhydrophobic surfaces that can enhance dropwise condensation in well-tailored supersaturation conditions. However, designs of most biomimetic surfaces were not driven by the understanding of underlying physical mechanisms. We report energy-based analysis of growth dynamics of condensates from surface cavities. As observed in condensation experiments, these textured surfaces with two tier roughness are superior to flat or solely nanotextured surfaces in spatial control of condensate droplets. To understand the role of condensate state transition in enhancing condensation heat transfer, we considered adhesion energy, viscous dissipation and contact line dissipation as the main portion of resistant energy that needs to be overcome by the condensates formed in surface cavities. By minimizing the energy barrier associated with the self-pulling process, we optimized first tier roughness on the hierarchically textured surfaces allowing condensates to grow preferentially in the out-of-plane direction. The nano-roughness of the second tier plays an important role in abating the adhesion energy in the cavities and contact line pinning. From the perspective of molecular kinetic theory, the dual scale engineered surface is beneficial to remarkably mitigating contact line dissipation. This study indicates that scaling down surface roughness to submicron scale can facilitate self-propelled condensate removal.

Effect of surface modification on interfacial nanobubble morphology and contact line tension

Soft Matter ◽  
2015 ◽  
Vol 11 (26) ◽  
pp. 5214-5223 ◽  
Author(s):  
Kaushik K. Rangharajan ◽  
Kwang J. Kwak ◽  
A. T. Conlisk ◽  
Yan Wu ◽  
Shaurya Prakash
Keyword(s):  
Atomic Force Microscopy ◽  
Surface Modification ◽  
Contact Line ◽  
Line Tension ◽  
Surface Hydrophobicity ◽  
Saturation State ◽  
Force Microscopy ◽  
Atomic Force ◽  
Mode Atomic Force Microscopy ◽  
Effect Of Surface

Using tapping mode atomic force microscopy, changes to interfacial nanobubble morphology and associated characteristics are analyzed as a function of surface hydrophobicity and solvent–air saturation state.

Contact Line Quadrilateral Relation. Generalization of the Neumann Triangle Relation To Include Line Tension

Langmuir ◽  
1996 ◽  
Vol 12 (24) ◽  
pp. 5956-5962 ◽  
Author(s):  
P. Chen ◽  
J. Gaydos ◽  
A. W. Neumann
Keyword(s):  
Contact Line ◽  
Line Tension

Experimental and Theoretical Study of Evaporation of a Volatile Liquid Lens on an Immiscible Liquid Surface

Langmuir ◽  
2019 ◽  
Vol 35 (40) ◽  
pp. 12979-12985 ◽  
Author(s):  
Lu Liu ◽  
Chuang Xu ◽  
Lutong Zhao ◽  
Menglong Mi ◽  
Chunxi Li
Keyword(s):  
Theoretical Study ◽  
Liquid Surface ◽  
Immiscible Liquid ◽  
Liquid Lens ◽  
Volatile Liquid

The spreading of surfactant-laden liquids with surfactant transfer through the contact line

2001 ◽  
Vol 440 ◽  
pp. 205-234 ◽  
Author(s):  
ENRIQUE RAMÉ
Keyword(s):  
Contact Line ◽  
Liquid Surface ◽  
Fluid Motion ◽  
Dynamic Contact ◽  
Contact Angles ◽  
Moving Contact Line ◽  
Surface Diffusivity ◽  
Moving Contact ◽  
Pure Fluid ◽  
Surfactant Transfer

We examine the spreading of a liquid on a solid surface when the liquid surface has a spread monolayer of insoluble surfactant, and the surfactant transfers through the contact line between the liquid surface and the solid. We show that, as in surfactant-free systems, a singularity appears at the moving contact line. However, unlike surfactant-free systems, the singularity cannot be removed by the same assumptions as long as surfactant transfer takes place. In an attempt to avoid modelling difficulties posed by the question of how the singularity might be removed, we identify parameters which describe the dynamics of the macroscopic spreading process. These parameters, which depend on the details of the fluid motion next to the contact line as in the pure-fluid case, also depend on the state of the spread surfactant in the macroscopic region, in sharp contrast to the pure-fluid case where actions at the macroscopic scale did not affect material spreading parameters. A model of the viscous-controlled region near the contact line which accounts for surfactant transfer shows that, at steady state, some ranges of dynamic contact angles and of capillary number are forbidden. For a given surfactant–liquid pair, these disallowed ranges depend upon the actual contact angle and on the transfer flux of surfactant.We also examine a possible inner model which accounts for the transfer via surface diffusivity and regularizes the stress via a slip model. We show that the asymptotic behaviour of this model at distances from the contact line large compared to the inner length scale matches to the viscous-controlled region. An example of how the information propagates is given.

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