Electrostatic assist of liquid transfer between plates and cavities

Huang, Chenfu; Carvalho, Márcio S.; Kumar, Satish

doi:10.1103/physrevfluids.4.044005

Cited by 4 publications

(1 citation statement)

References 41 publications

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“…We choose a VOF approach with a diffuse interface based on its success in prior studies with moving contact lines. Alternative approaches to incorporating moving contact lines split between those where the dynamic contact angle is an input [68,69] and those where it is an output [70,71] of the numerical simulation. We choose as an 'input' contact-line model the Kistler empirical correlation [72] since this experimentally determined correlation has demonstrated engineering utility.…”

Section: Simulation Perspectivementioning

confidence: 99%

Sweeping by Sessile Drop Coalescence

Ludwicki,

Steen

2020

Preprint

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During coalescence of liquid drops contacting a solid, the liquid sweeps wetted and solid-projected areas. The extent of sweeping dictates the performance of devices such as self-cleaning surfaces, antifrost coatings, water harvesters, and dropwise condensers. For these applications, weakly-and non-wetting solid substrates are preferred as they enhance drop dynamical behavior. Accordingly, our coalescence studies here are restricted to drops with contact angle 90°≤ θ0 ≤ 180°. Binary sessile drop coalescence is the focus, with volume of fluid simulations employed as the primary tool. The simulations, which incorporate a Kistler dynamic contact angle model, are first validated against three different experimental substrate systems and then used to study the influence of solid wettability on sweeping by modifying θ0. With increasing θ0 up to 150°, wetted and projected swept areas both increase as drop center of mass heightens. For θ0 ≥ 150°, coalescence-induced drop jumping occurs owing to the decreasing wettability of the substrate and a focusing of liquid momentum due to the symmetry-breaking solid. In this regime, projected swept area continues to increase with θ0 while wetted swept area reaches a maximum and then decreases. The sweeping results are interpreted using the mechanical energy balance from hydrodynamic theory and also compared to free drop coalescence.

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Section: Simulation Perspectivementioning

confidence: 99%

Sweeping by Sessile Drop Coalescence

Ludwicki,

Steen

2020

Preprint

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Breakup mechanism of the electrically induced conical liquid bridge

Wang

et al. 2022

Physics of Fluids

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The breakup mechanism of a conical liquid bridge, based on the previously proposed electrostatic liquid loading method, is reported for the first time. The breakup criterion in terms of interface feature size is derived. Based on the criterion, the breakup mechanism can be categorized as either spontaneous breakup or stretching breakup. The evolution of interface and velocity for two breakup behaviors is subsequently investigated. For spontaneous breakup, the remnant volume Vd depends primarily on the top radius Rt and is proportional to the square of Rt. For stretching breakup, the remnant volume depends on the early stage of the stretching and Vd is proportional to the cube of Rt. In addition, the influence of stretching velocity U is examined. Results show that U has a weaker effect on the change of remnant volume than the top radius Rt for large capillary numbers. This study is helpful in understanding the liquid bridge breakup mechanism and improving the transfer printing process.

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Review on the Dynamics of Isothermal Liquid Bridges

Montanero

Ponce-Torres

2019

Applied Mechanics Reviews

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In this review, we describe both theoretical and experimental results on the dynamics of liquid bridges under isothermal conditions with fixed triple contact lines. These two major restrictions allow us to focus on a well-defined body of literature, which has not as yet been reviewed in a comprehensive way. Attention is mainly paid to liquid bridges suspended in air, although studies about the liquid–liquid configuration are also taken into account. We travel the path from equilibrium to nonlinear dynamics of both Newtonian liquid bridges and those made of complex fluids. Specifically, we consider equilibrium shapes and their stability, linear dynamics in free and forced oscillations under varied conditions, weakly nonlinear behavior leading to streaming flows, fully nonlinear motion arising during stretching and breakup of liquid bridges, and problems related to rheological effects and the presence of surfactant monolayers. Although attention is mainly paid to fundamental aspects of these problems, some applications derived from the results are also mentioned. In this way, we intend to connect the two approaches to the liquid bridge problem, something that both theoreticians and experimentalists may find interesting.

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Electrostatic assist of liquid transfer between plates and cavities

Cited by 4 publications

References 41 publications

Sweeping by Sessile Drop Coalescence

Sweeping by Sessile Drop Coalescence

Breakup mechanism of the electrically induced conical liquid bridge

Review on the Dynamics of Isothermal Liquid Bridges

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