Effects of charge relaxation on the electrohydrodynamic breakup of leaky-dielectric jets

Nie, Qichun; Li, Fang; Ma, Qianli; Fang, Haisheng; Yin, Zhouping

doi:10.1017/jfm.2021.639

Cited by 13 publications

(9 citation statements)

References 54 publications

(162 reference statements)

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“…• The electric field does not affect the thinning rate asymptotically close to the pinching point, even though the polarization stress may diverge in that limit. A similar conclusion was obtained for both perfect 15 and non-perfect 16,21 conductors under a radial electric field. In these cases, the asymptotic self-similar solution becomes that of the non-electrified case.…”

Section: Articlesupporting

confidence: 80%

“…The tangential electrostatic force also plays a key role in the formation of quasi-spike structures during the breakup of viscoelastic electrically charged jets. 19 Lakdawala et al 20 showed that the local dynamics of a jet in a radial electric field might be altered when the conduction is weak, while Nie et al 21 have numerically shown that charge relaxation does not generally affect the self-similar dynamics at pinch-off of a leaky-dielectric jet.…”

Section: Introductionmentioning

confidence: 99%

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Effect of an axial electric field on the breakup of a leaky-dielectric liquid filament

et al. 2021

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We study experimentally and numerically the thinning of Newtonian leaky-dielectric filaments subjected to an axial electric field. We consider moderately viscous liquids with high electrical permittivity. We analyze the influence of the electric field on the formation of satellite droplets from the breakup of the filaments in the experiments. The electric force delays the free surface pinching. Two electrified filaments with the same minimum radius are thin at the same speed regardless of when the voltage is applied. The numerical simulations show that the polarization stress is responsible for the pinching delay observed in the experiments. Asymptotically close to the pinching point, the filament pinching is dominated by the diverging hydrodynamic forces. The polarization stress becomes subdominant even if this stress also diverges at this finite-time singularity.

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Section: Articlesupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Effect of an axial electric field on the breakup of a leaky-dielectric liquid filament

et al. 2021

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“…The effects of ink rheological and elec-trical properties and technological parameters on the cone jets/droplets morphology, fracture mode, and deposition behaviors were studied. As shown in Figure 3 [31][32][33][34][35][36], both qualitative and quantitative results were obtained. For example, the vibration model of the Taylor cone meniscus was developed, and the oscillation characteristics including frequency and mode were calculated [32].…”

Section: Electrohydrodynamic Direct-writing Technologymentioning

confidence: 81%

“…As shown in Figure 3(a), different from traditional "extrusion" inkjet printing technologies such as piezoelectric and thermal bubbles methods, electrohydrodynamic (EHD) jet [32][33][34], Copyright@2021, AIP; Copyright@2019, Elsevier; Copyright@2021, Cambridge University Press. (c) Novel technologies (Mechano-electrospinning, reprinted with permission from ref.…”

Section: Electrohydrodynamic Direct-writing Technologymentioning

confidence: 99%

Flexible electronics manufacturing technology and equipment

Yin

Huang

Yang

et al. 2022

Sci. China Technol. Sci.

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Flexible electronics such as mechanically compliant displays, sensors and solar cells, have important applications in the fields of energy, national defence and biomedicine, etc. Various types of flexible electronics have been proposed or developed by the improvements in structural designs, material properties and device integrations. However, the manufacturing of flexible electronics receives little attention, which limits its mass production and industrialization. The increasing demands on the size, functionality, resolution ratio and reliability of flexible electronics bring several significant challenges in their manufacturing processes. This work aims to report the state-of-art technologies and applications of flexible electronics manufacturing. Three key technologies including electrohydrodynamic direct-writing, flip chip and automatic optical inspection are highlighted. The mechanism and developments of these technologies are discussed in detail. Based on these technologies, the present work develops three kinds of manufacturing equipment, i.e., inkjet printing manufacturing equipment, robotized additive manufacturing equipment, and roll-to-roll manufacturing equipment. The advanced manufacturing processes, equipment and systems for flexible electronics pave the way for applications of new displays, smart sensing skins and epidermal electronics, etc. By reviewing the developments of flexible electronics manufacturing technology and equipment, it can be found that the existing advances greatly promote the applications and commercialization of flexible electronics. Since flexible electronics manufacturing contains many multi-disciplinary problems, the current investigations are confronted with great challenges. Therefore, further developments of the reviewed manufacturing technology and equipment are necessary to break the current limitations of manufacturing resolution, efficiency and reliability. flexible electronics, micro/nano manufacturing, electrohydrodynamic direct-writing, flip chip, automatic optical inspection

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“…The leaky-dielectric model and ALE technique have proven to be extremely applicable for simulating electrohydrodynamic problems, such as pinching of charged jets (Nie et al. 2021), tip streaming and emission of charged drops (Collins et al. 2008; Wagoner et al.…”

Section: Introductionmentioning

confidence: 99%

Electrohydrodynamic-induced partial coalescence between a droplet and a liquid–air interface

Chen

Yin

et al. 2023

J. Fluid Mech.

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When a droplet coalesces with a flat liquid–air interface, a secondary drop may be left behind resulting in only a partial coalescence rather than complete coalescence. In this paper, we employ an arbitrary Lagrangian–Eulerian method to demonstrate that applying an electric field favours the occurrence of partial coalescence. To understand this phenomenon, we systematically study the effect of an external electric field on the coalescence process between a droplet and a liquid–air interface. In an electric field, the induced electric stresses can overcome the downward flow of the droplet, thus lifting it upwards. As a result, the positive Laplace pressure in the neck region squeezes the droplet towards pinch-off. We observe that both the initial neck expansion and neck shrinkage are suppressed by the electric field. These effects become weaker as the Ohnesorge number $Oh$ increases. Based on the scaling analysis, we report a critical Ohnesorge number $O{h_c} = 14.39{\varGamma ^{3/2}} + 0.029$ to quantify the transition from partial coalescence to complete coalescence in the presence of an electric field, where $\varGamma $ represents the dimensionless electric Bond number. Finally, a relationship between the secondary droplet size and the two key dimensionless numbers of $Oh$ and $\varGamma $ has been developed, which could be useful for producing droplets of desired sizes in microfluidic applications.

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Effects of charge relaxation on the electrohydrodynamic breakup of leaky-dielectric jets

Abstract: Abstract

Cited by 13 publications

References 54 publications

Effect of an axial electric field on the breakup of a leaky-dielectric liquid filament

Effect of an axial electric field on the breakup of a leaky-dielectric liquid filament

Flexible electronics manufacturing technology and equipment

Electrohydrodynamic-induced partial coalescence between a droplet and a liquid–air interface

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