Modeling the effect of surface forces on the equilibrium liquid profile of a capillary meniscus

Soft Matter ◽  
2014 ◽  
Vol 10 (32) ◽  
pp. 6024-6037 ◽  
Author(s):  
Igor V. Kuchin ◽  
Omar K. Matar ◽  
Richard V. Craster ◽  
Victor M. Starov
Keyword(s):  
Contact Line ◽  
Surface Force ◽  
Surface Forces ◽  
Force Action ◽  
Phase Contact ◽  
Three Phase ◽  
Equilibrium Profile ◽  
Combined Action ◽  
Capillary Pressures ◽  
Effect Of Surface

The effect of the surface force action on the equilibrium profile of a meniscus in the vicinity of an apparent three phase contact line under a combined action of disjoining/conjoining and capillary pressures is modelled and analysed.

Effect of Surface Roughness on the Behavior of Bubbles Growing and Departing From a Heated Surface

2017 ◽  
Author(s):  
Navdeep S. Dhillon
Keyword(s):  
Surface Roughness ◽  
Contact Line ◽  
Bubble Growth ◽  
High Speed ◽  
Heated Surface ◽  
Scaling Analysis ◽  
Phase Contact ◽  
Bubble Behavior ◽  
Three Phase ◽  
Effect Of Surface

The phenomenon of bubble growth on a heated surface is of fundamental importance in many scientific and engineering applications, including boiling heat transfer. Although the growth of a homogeneous bubble in a pool of hot liquid is well understood, bubbles growing on hot solid surfaces involve evaporation from a three-phase contact line and therefore exhibit several peculiar features. One of these is the effect of surface texture and wetting properties on the size and timing of bubbles that form and depart from a uniformly heated surface. Here, we present pool boiling experimental results elucidating this important phenomenon. Using high-speed optical imaging, we perform a comparative study of the process of growth and departure of bubbles on plain and rough surfaces and explore the different factors that dictate this behavior. Using scaling analysis, we analyze the primary forces acting on a growing bubble and show that the effect of surface roughness on bubble behavior can be explained in terms of the dependence of these forces on the rate of bubble growth and in-turn on the rate of thin-film evaporation from the three-phase contact line of the bubble.

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

Faster Nucleation of Ice and Carbon Dioxide Hydrates at the Three-Phase Contact Line

2021 ◽  
Author(s):  
Aritra Kar ◽  
Awan Bhati ◽  
Palash V. Acharya ◽  
Ashish Mhadeshwar ◽  
Roger Bonnecaze ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Contact Line ◽  
Phase Contact ◽  
Three Phase

Effect of Charge Distribution at the Three Phase Contact Line for an Electrolyte Drop

2013 ◽  
Author(s):  
Dibyo Sarkar ◽  
Siddhartha Das ◽  
Sushanta K. Mitra
Keyword(s):  
Velocity Field ◽  
Electrolyte Solution ◽  
Contact Line ◽  
Electric Double Layer ◽  
Charged Surface ◽  
Electrokinetic Transport ◽  
Phase Contact ◽  
Advective Flux ◽  
Three Phase ◽  
First Time

In this paper, we obtain the velocity field in a wedge in a Three Phase Contact Line (TPCL) in an electrolyte drop which is evaporating on a charged solid. Combination of an electrolyte solution and the charged surface leads to the formation of an Electric Double Layer (EDL), which in presence of the evaporation-triggered pressure-driven transport, leads to the generation of a streaming current that causes an electrokinetic transport. Hence, we analyze for the first time an electrokinetic transport in a charged wedge in presence of an evaporation-induced advective flux. Our results exhibit flow patterns that are distinctly different as compared to that of the case where there is no such electrokinetic transport and the problem is merely that of evaporation in a wedge.

Numerical Simulation of Digital Microfluidics Based on Electro-Dynamic Model

2012 ◽  
Vol 2 (3) ◽  
pp. 14-23
Author(s):  
Liguo Chen ◽  
Mingxiang Ling ◽  
Deli Liu
Keyword(s):  
Numerical Simulation ◽  
Simulation Model ◽  
Contact Line ◽  
Contact Area ◽  
Digital Microfluidics ◽  
Phase Contact ◽  
Electrowetting On Dielectric ◽  
Three Phase ◽  
Internal Mechanism ◽  
Contact Domain

Aiming at the doubt and divarication about the internal mechanism of electrowetting on dielectric (EWOD) in digital microfluidics, the authors attempted to explain the internal mechanism of EWOD through electro-dynamic-based numerical simulation model. First, the boundary conditions for the governing equation were found. Then the influence of mesh number on simulation results was analyzed and feasibility of the simulation model was verified by comparing numerical results with theoretical ratiocination. Finally, they compared the electro-dynamic actuation force acting on the surface of droplet on three digital microfluidic structures, which have the same three-phase contact line but different area of contact domain. Analytical results showed that electro-dynamic force generated solely by the accumulation of induced charges in contact domain was three times larger than that generated by three-phase contact line. Induced charges accumulated on both three-phase contact line and contact area of droplet gave the contribution to EWOD, but contact area played a major role in the change of contact angle of droplet.

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