scholarly journals ANALYSIS OF LIQUID PENETRATION BY CAPILLARY FORCE CONSIDERING DYNAMIC ALTERATION OF CONTACT ANGLE IN A CAPILLARY TUBE

2019 ◽  
Vol 75 (1) ◽  
pp. 37-46
Author(s):  
Yuya KANEUJI ◽  
Tomoyo TANIGUCHI
Keyword(s):  
Contact Angle ◽  
Capillary Force ◽  
Capillary Tube ◽  
Liquid Penetration ◽  
Dynamic Alteration

On an approximate model for the shape of a liquid–air interface receding in a capillary tube

1997 ◽  
Vol 342 ◽  
pp. 87-96 ◽  
Author(s):  
E. RAMÉ
Keyword(s):  
Boundary Condition ◽  
Contact Angle ◽  
Static Pressure ◽  
Capillary Tube ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Approximate Model ◽  
Viscous Stress ◽  
Air Interface ◽  
Constant Static Pressure

A good approximation to modelling the shape of a liquid–air meniscus advancing or receding in a capillary tube of radius a can be constructed by balancing the curvature of the interface with the sum of a viscous stress valid near the contact line and a constant static pressure. This model has unique solutions for each value of the boundary condition, i.e. the dynamic contact angle. When the meniscus recedes at very small capillary numbers, the model predicts a critical receding velocity beyond which a liquid layer of the receding fluid (a liquid tail) develops along the solid (see figure 4). The length of the layer increases as the receding speed and the contact angle decrease. This layer regime is characterized by menisci whose macroscopic curvature is >1/a.

Three-dimensional micropatterning of semiconducting polymers via capillary force-assisted evaporative self-assembly

Soft Matter ◽  
2019 ◽  
Vol 15 (19) ◽  
pp. 3854-3863 ◽  
Author(s):  
Jae In Shin ◽  
Su Jung Cho ◽  
Jisoo Jeon ◽  
Kwang Hee Lee ◽  
Jeong Jae Wie
Keyword(s):  
Self Assembly ◽  
Capillary Force ◽  
Capillary Tube ◽  
Three Dimensional ◽  
Semiconducting Polymers ◽  
3 Dimensional

Controlled evaporative self-assembly of P3HT is conducted in a 3-dimensional capillary tube.

Influence of paper properties on adhesive strength of starch gluing

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Claudia Anna Dohr ◽  
Ulrich Hirn
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Main Parameter ◽  
External Pressure ◽  
Liquid Penetration ◽  
Surface Wetting ◽  
Paper Properties ◽  
Substantial Correlation ◽  
The Relationship ◽  
Effect Of Surface

Abstract The effect of paper properties on the strength of starch gluing for Kraft sack papers has been investigated. We analyzed the effect of surface roughness, wettability and glue penetration. Surface roughness was found not to be related to gluing strength, also surface wetting measured by contact angle showed only a weak relation. Liquid penetration measured by ultrasound (ULP) was found to have a substantial correlation to gluing strength. Comparing ULP liquid penetration speed with actual glue uptake during the gluing process we found that they are only moderately connected. We are attributing this to the fact that the penetration and spreading of the glue on the paper is driven by applying an external pressure during the gluing process, which is not the case for the liquid penetration measurement. Investigating how asymmetrical glue penetration affects gluing strength we found that the relationship was low. The best indication for gluing strength turned out to be the surface wetting/substrate swelling parameter from the ultrasonic liquid penetration measurement. We conclude that the main parameter capturing gluing strength combines the influence of fiber wetting and penetration of the glue into the fibers.

Capillarity, wetting, and surface (interfacial) tension

Surfactants ◽  
2019 ◽  
pp. 25-52
Author(s):  
Bob Aveyard
Keyword(s):  
Contact Angle ◽  
Interfacial Tension ◽  
Solid Surface ◽  
Vapour Pressure ◽  
Pressure Difference ◽  
Capillary Tube ◽  
Intermolecular Forces ◽  
Liquid Interface ◽  
Interfacial Tensions ◽  
Drop Radius

Capillarity reflects the action of interfacial tension and has been central to understanding intermolecular forces. When a liquid meets a solid surface (with contact angle θ‎) it forms a meniscus which is associated with the rise/depression of liquid in a capillary tube, hence the term capillarity. Interfacial tensions also determine how a liquid wets and adheres to a solid or another liquid. Liquid menisci are curved, and Young, Laplace, and Kelvin have all thrown light upon the properties of curved liquid surfaces. The Young–Laplace equation relates the pressure difference across a curved liquid interface to both the interfacial tension and curvature of the interface. Interfacial tension also gives rise to a dependence of the vapour pressure (and solubility) of a liquid on the curvature of its surface (e.g. drop radius), as expressed in the Kelvin equation. Common methods for measurement of interfacial tensions are described in an Appendix.

Microobjects Gripping with Controllable Menisci Based on Pressure Adjustment

2013 ◽  
Vol 373-375 ◽  
pp. 116-121 ◽  
Author(s):  
Le Feng Wang ◽  
Nan Nan Guan ◽  
Wei Bin Rong ◽  
Li Ning Sun
Keyword(s):  
Liquid Bridge ◽  
Capillary Force ◽  
Capillary Tube ◽  
Liquid Level ◽  
Height Difference ◽  
Nozzle Orifice ◽  
Lifting Force ◽  
Fluent Software

Flexible and reliable gripping is a fundamental task in various micromanipulation and microassembly fields. Shape-controllable menisci based on pressure adjustment were proposed to pick up microobjects. Lifting force is provided by a controllable liquid bridge which is formed between the capillary tube and the microobject. The volume and the shape of the meniscus could be regulated dynamically by changing the pressure at the capillary nozzle orifice, thus the capillary force alters correspondingly. The pressure adjustment was realized by adjusting the height of the reservoir device precisely. Fluent software was used to simulate the fluid meniscus under different pressures. Experiments were performed to achieve controllable meniscus with different height difference of liquid level between the reservoir device and the capillary nozzle orifice, and microobjects griping operations were executed to verify the method.

scholarly journals Short timescale wetting and penetration on porous sheets measured with ultrasound, direct absorption and contact angle

RSC Advances ◽  
2018 ◽  
Vol 8 (23) ◽  
pp. 12861-12869 ◽  
Author(s):  
Krainer Sarah ◽  
Hirn Ulrich
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Porous Media ◽  
Measurement Methods ◽  
Liquid Penetration ◽  
Direct Absorption ◽  
Short Timescale ◽  
Thin Porous Media

Liquid penetration and wetting on thin, porous media is studied using three different measurement methods, and using testing liquids with tailored viscosity, polarity and surface tension.

Effect of Contact Angle Hysteresis on Liquid Bridge while Sphere Particles are in Relative Movement

2013 ◽  
Vol 634-638 ◽  
pp. 2945-2948
Author(s):  
Song Yang ◽  
Jun Hua Wu ◽  
Xin Wang
Keyword(s):  
Contact Angle ◽  
Liquid Bridge ◽  
Capillary Force ◽  
Contact Angle Hysteresis ◽  
Capillary Forces ◽  
Hysteresis Effect ◽  
Liquid Volume ◽  
Liquid Bridges ◽  
Relative Movement ◽  
Important Impact

Hysteresis effect of contact angle has an important impact on liquid bridges between sphere particles. This effect is not limited to increasing liquid volume of fixed particles. The hysteresis effect of contact angle is expressed by fixed liquid volume while the two sphere particles are in relative movement. The hysteresis effect of contact angle on the liquid bridge is also significant. In this paper, the hysteresis effect of contact angle on capillary forces of liquid bridges is analyzed when the two sphere particles are in relative movement. Results indicate that contact angle hysteresis effects on capillary force are significant.

Thin Liquid Film Profile Near the Interline Region in a Capillary Tube

2007 ◽  
Author(s):  
Wei Qu ◽  
Jianchao Feng ◽  
Tongze Ma
Keyword(s):  
Heat Transfer ◽  
Contact Angle ◽  
Film Thickness ◽  
Liquid Film ◽  
Perturbation Method ◽  
Analytical Solutions ◽  
Capillary Tube ◽  
Thin Liquid Film ◽  
Axial Curvature ◽  
Film Profile

Thin liquid film profile is important for heat transfer in microscale space. The asymptotic analytical solutions for thin liquid film profile in a capillary tube are obtained by the perturbation method. The variation of the film thickness, the contact angle of the vapor-liquid interface and its axial curvature depend on the effects of the disjoinng pressure and the capillary pressure. The thin liquid film profile will change significantly near the interline region. The obtained solutions are convenient and applicable for problems of thin liquid film in a capillary tube.

scholarly journals Hydrodynamic Study of an Oscillating Meniscus in a Square Mini-Channel

2009 ◽  
Author(s):  
Yajuvendra Singh Shekhawat ◽  
Sameer Khandekar ◽  
Pradipta Kumar Panigrahi
Keyword(s):  
Contact Angle ◽  
High Speed ◽  
Capillary Tube ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Glass Capillary ◽  
Two Fluids ◽  
Silicon Oil ◽  
Static Contact ◽  
Micro Systems

Miniaturized fluidic systems like MEMS may involve single-phase or multi-phase flows with oscillations/ pulsations. Understanding the hydrodynamics of such flows can help in manipulating the performance parameters and improving the efficiency of micro-systems. This work focuses on hydrodynamics of a sinusoidally oscillating meniscus in a square mini-channel. The interfacial contact line behavior of a single oscillating meniscus formed between liquid slug and air, inside the square capillary tube, has been explored. An eccentric cam follower system has been fabricated to provide sinusoidal oscillations of fluid in the square glass capillary having hydraulic diameter of 2.0 mm. Experiments are conducted with two fluids, water and silicon oil. Dynamic contact angle measurements are carried out for water at two oscillating frequencies, 0.25 Hz and 0.50 Hz using high speed videography. It is seen that an increase in the oscillating frequency increases the difference in the advancing angle and receding angle of the meniscus, with the static contact angle of water on glass surface around 21°. For silicon oil the experiments have been performed at eight different frequencies in the range of 0.20 Hz and 1.00 Hz. It is seen that the meniscus is pinned at the extreme end of the stroke, unlike that in the case of water, and there is a film of silicon oil during oscillations. The thickness of the film formed increases with increase in oscillating frequency. There is considerable difference in the hydrodynamics of silicon oil and water.

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