Liquid Transfer in Printing Processes: Liquid Bridges with Moving Contact Lines

Kumar, Satish

doi:10.1146/annurev-fluid-010814-014620

Cited by 164 publications

(125 citation statements)

References 117 publications

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“…Note that the two disks are nominally identical with the same contact angles in all cases considered in the present study. The symmetric rupture is consistent with the results of previously reported liquid partitioning studies [17][18][19] .…”

Section: Relative Rupture Location and Partial Liquid Volumesupporting

confidence: 92%

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A Combined Experimental and Numerical Modeling Study of the Deformation and Rupture of Axisymmetric Liquid Bridges under Coaxial Stretching

Zhuang

2015

Langmuir

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Abstract:The deformation and rupture of axisymmetric liquid bridges being stretched between two fully wetted coaxial disks are studied experimentally and theoretically. We numerically solve the time-dependent Navier-Stokes equations while tracking the deformation of the liquid-air interface using the Arbitrary Lagrangian-Eulerian (ALE) moving mesh method to fully account for the effects of inertia and viscous forces on bridge dynamics. The effects of the stretching velocity, liquid properties, and liquid volume on the dynamics of liquid bridges are systematically investigated to provide direct experimental validation of our numerical model for stretching velocities as high as 3 m/s. The Ohnesorge number (Oh) of liquid bridges is a primary factor governing the dynamics of liquid bridge rupture, especially the dependence of the rupture distance on the stretching velocity. The rupture distance generally increases with the stretching velocity, far in excess of the static stability limit. For bridges with low Ohnesorge numbers, however, the rupture distance stay nearly constant or decreases with the stretching velocity within certain velocity windows due to the relative rupture position switching and the thread shape change. Our work provides an experimentally validated modeling approach and experimental data to help establish foundation for systematic further studies and applications of liquid bridges.

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Section: Relative Rupture Location and Partial Liquid Volumesupporting

confidence: 92%

“…Other studies examined the post-rupture behavior of liquid bridges, such as satellite droplet formation 16 and volume partitioning [17][18][19] . These phenomena are particularly relevant for printing industry.…”

Section: Introductionmentioning

confidence: 99%

A Combined Experimental and Numerical Modeling Study of the Deformation and Rupture of Axisymmetric Liquid Bridges under Coaxial Stretching

Zhuang

2015

Langmuir

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“…the sliding droplets on an inclined surface and the evaporating droplet on a horizontal surface). The understanding of the force associated with the vertical detachment of droplets from solid surfaces benefits a broad range of applications, such as the transportation of droplets, 53 self-propelled droplets for enhanced condensation, 54 on-demand capture and release of organic droplets, 55 offset printing, 56 fabrication of solar cells 57 and fabrication of particles with negative curvature. 58 To achieve facilitated droplet detachment for applications such as the transportation of droplets, as revealed in this study, surfaces engineered with pillars are the preferred candidate over pores.…”

Section: Comment On Implications Of This Studymentioning

confidence: 99%

Direct Measurements of Adhesion Forces for Water Droplets in Contact with Smooth and Patterned Polymers

SunYujin

Jiang

ChoiChang-Hwan

et al. 2017

Surface Innovations

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A microelectronic balance system was employed to measure the force of spreading (snap-in force) during water droplet attachment and spreading on polymer surfaces and the water-polymer adhesion forces (maximum adhesion and pulloff forces) after droplet compression, retreat and detachment. Equipped with a charge-coupled device camera and data acquisition software, the instrument measured directly the forces; monitored droplet-surface separation, including distances over which droplet stretched; and collected optical images simultaneously. The images were used to analyze capillary and surface tension forces based on measured droplet shape, surface curvature, droplet base radius and values of contact angles. The forces measured with the microbalance were compared to calculated capillary/surface tension forces. Nearly excellent agreement between directly measured and calculated forces was verified for polymers with smooth surfaces. Experiments with patterned polymers with pores and pillars revealed that interpretation of forces requires knowledge of a triple-contact-line characteristic. One relevant parameter, named normalized contact line length, was introduced to surface tension forces to quantify forces measured directly with a microbalance.

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“…This can be deduced for systems with a variational structure 2 by representing the potential energy with respect to all dynamically accessible configurations: There are more possible configurations with less potential energy for less-constrained equilibrium states and, therefore, more possible modes of instability 41,45,46 . Applications of these concepts to contact-line constraints, which are of interest to contact-drop dispensing, have been discussed in recent reviews [47][48][49] . By definition, CAH is a relationship between the surface wettability and contact-line constraint on non-ideal surfaces and, thus, is expected to influ- Figure 4: Pinned-to-free contact-line transition scenarios to be examined for stability loss of liquid bridges on surfaces with CAH.…”

Section: Stability-constraint Relationship: Overviewmentioning

confidence: 99%

Liquid-bridge stability and breakup on surfaces with contact-angle hysteresis

Akbari

Hill

2016

Soft Matter

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We study the stability and breakup of liquid bridges with a free contact line on surfaces with contact-angle hysteresis (CAH) under zero-gravity conditions. Non-ideal surfaces exhibit CAH because of surface imperfections, by which the constraints on three-phase contact lines are influenced. Given that interfacial instabilities are constraintsensitive, understanding how CAH affects the stability and breakup of liquid bridges is crucial for predicting the drop size in contact-drop dispensing. Unlike ideal surfaces on which contact lines are always free irrespective of surface wettability, contact lines may undergo transitions from pinned to free and vice-versa during drop deposition on non-ideal surfaces. Here, we experimentally and theoretically examine how stability and breakup are affected by CAH, highlighting cases where stability is lost during a transition from a pinned-pinned (more constrained) to pinned-free (less constrained) interface-rather than a critical state. This provides a practical means of expediting or delaying stability loss. We also demonstrate how the dynamic contact angle can control the contact-line radius following stability loss. *

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Liquid Transfer in Printing Processes: Liquid Bridges with Moving Contact Lines

Cited by 164 publications

References 117 publications

A Combined Experimental and Numerical Modeling Study of the Deformation and Rupture of Axisymmetric Liquid Bridges under Coaxial Stretching

A Combined Experimental and Numerical Modeling Study of the Deformation and Rupture of Axisymmetric Liquid Bridges under Coaxial Stretching

Direct Measurements of Adhesion Forces for Water Droplets in Contact with Smooth and Patterned Polymers

Liquid-bridge stability and breakup on surfaces with contact-angle hysteresis

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