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Littérature scientifique sur le sujet « Charged pendant droplet »

Auteur : Grafiati

Publié le 29 mars 2025

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Articles de revues sur le sujet "Charged pendant droplet"

Xu, Lei, et Chao Wang. « Electric Field of the Tip-Plane Electrode Configuration in Electrohydrodynamic Printing ». Applied Mechanics and Materials 278-280 (janvier 2013) : 101–4. http://dx.doi.org/10.4028/www.scientific.net/amm.278-280.101.

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Electrohydrodynamic printing draws much attention as it is a promising micro/nano patterning method and can ejects high-viscosity solution. The solution is pulled out of a nozzle under a high voltage. A used tip-plane electrode configuration is composed of a conducting plane collector and a hyperbola-shaped solution pendant adhered to a steel nozzle in electrohydrodynamic printing. The electric field between electrodes is extremely non-uniform owing to structural complexity of electrode configuration. We disintegrate the overall electric field into three components: a charge-free space field, a charged droplet field and an ion field. Proper models for those fields are set up and analyzed. The result shows that the elliptic-cylinder model, a dominant component for the jetting, is available for the field. The charged droplet field hardly deforms the space field in low-frequency pulsation mode, but influences the jetting in high-frequency pulsation mode. The ion field caused by space ions is little and negligible.

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Mestel, A. J. « Electrohydrodynamic stability of a slightly viscous jet ». Journal of Fluid Mechanics 274 (10 septembre 1994) : 93–113. http://dx.doi.org/10.1017/s0022112094002053.

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Many electro-spraying devices raise to a high electric potential a pendant drop of weakly conducting fluid, which may adopt a conical shape from whose apex a thin, charged jet is emitted. Such a jet eventually breaks up into fine droplets, but often displays surprising longevity. This paper examines the stability of an incompressible cylindrical jet carrying surface charge in a tangential electric field, allowing for the finite rate of charge relaxation. The viscosity is assumed to be small so that the shear resulting from the tangential surface stress can be large, even for relatively small fields. This shear can suppress surface tension instabilities, but if too large, it excites electrical ones. For imperfect conductors, surface charge is redistributed by the rapid fluid reaction to variations in tangential stress as well as by conduction. Phase differences between the effects due to the tangential field and the surface charge lead to charge ‘over-relaxation’ instabilities, but the maximum growth rate can still be lower than in the absence of electric effects.

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Mestel, A. J. « Electrohydrodynamic stability of a highly viscous jet ». Journal of Fluid Mechanics 312 (10 avril 1996) : 311–26. http://dx.doi.org/10.1017/s0022112096002029.

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When a pendant drop of weakly conducting fluid is raised to a high electric potential, it frequently adopts the shape of a Taylor cone from whose apex a thin, charged jet is emitted. Such a jet can display surprising longevity, but eventually breaks up into fine droplets, a fact utilized in electro-spraying devices. This paper examines the linear stability of an incompressible cylindrical jet carrying surface charge q in a tangential electric field E, for various values of the permittivity ratio λ and the finite rate of charge relaxation, τ. The viscosity is assumed to be large. It is shown that all axisymmetric temporal modes can be stabilized for suitable values of (q, E), but sinuous modes with logarithmically large wavelengths are unstable. If these very long waves are excluded, the jet can sometimes be completely stabilized. It is also shown that an uncharged jet with low permittivity is unstable to sinuous waves for large E, contrary to previous belief.

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Biswal, Debabrat, Bahni Ray, Debabrata Dasgupta, Rochish M. Thaokar et Y. S. Mayya. « Study of electro-migration and capture of particles by a charged pendant droplet ». Journal of Aerosol Science, décembre 2023, 106313. http://dx.doi.org/10.1016/j.jaerosci.2023.106313.

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Thèses sur le sujet "Charged pendant droplet"

Dokmak, Akaber. « Investigating the effect of an electric field on the properties and kinetics of a drying pendant droplet : A new experimental approach ». Electronic Thesis or Diss., Ecole nationale des Mines d'Albi-Carmaux, 2025. http://www.theses.fr/2025EMAC0001.

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Le séchage assisté par champ électrique est une technique prometteuse pour la manipulation des produits thermosensibles, mais son étude à l'échelle de la goutte reste limitée en raison du manque de dispositifs expérimentaux adaptés. Cette étude présente un dispositif permettant d'analyser la déformation et le séchage de gouttes pendantes électriquement chargées de CuSO4.5H4O sous un champ électrique (0-800 kV/m) et à différentes concentrations en solides (0-25 % wt/wt). Les résultats montrent une réduction de la tension interfaciale pouvant atteindre 42 % avec l'intensité du champ. L'expansion de surface et la déformation sont également influencées. En séchage diffusif, le champ réduit initialement le taux d'évaporation et le flux évaporatoire des gouttes déformées avant qu'il n'augmente et se stabilise, tandis qu'en séchage convectif, l'expansion de surface réduit temporairement le flux avant stabilisation. Ces résultats apportent de nouvelles perspectives sur les effets électrohydrodynamiques lors du séchage à l'échelle de la goutte
Electrically assisted drying is a promising technique for thermosensitive products, however its study at the droplet scale remains limited due to the lack of suitable experimental setups. This study introduces a novel device to analyze the deformation and drying of pendant electrically charged droplets of CuSO4.5H4O under an electric field (0-800 kV/m) and varying solid concentrations (0 - 25 wt/wt %). Results show up to a 42 % reduction in interfacial tension with increasing field intensity. Surface expansion and deformation are influenced by both field intensity and solid content. In terms of drying, results show that under diffusive drying, the field initially reduces the evaporative flux of highly deformed droplets before it increases and stabilizes, while in convective drying, surface expansion temporarily reduces the flux before stabilization. These findings provide new insights into electrohydrodynamic effects on droplet scale drying dynamics

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Actes de conférences sur le sujet "Charged pendant droplet"

Qu, Jie, Luis Escobar, Zhonghao Rao et Ben Xu. « Experimental Study of Brine Droplet Evaporation and Crystallization at Various Temperatures and Humidity Using EDB Method and Pendant Droplet Method ». Dans ASME 2019 Heat Transfer Summer Conference collocated with the ASME 2019 13th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ht2019-3644.

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Abstract In this study, both electro-dynamic balance (EDB) method and pendant droplet method were employed to study the evaporation and crystallization process of brine droplet. The EDB setup was used to levitate the charged micrometer sized droplets to study the evaporation process. The pendant droplet method could hang millimeter sized droplet to study the crystallization process. The evaporation of brine droplets with different mass concentrations was visualized by a high speed camera under different temperatures and relative humidity in the test chamber. The results showed that EDB method could get the accurate droplet evaporation results which obeyed the classic D2-law. It was found that the evaporation was increased with the decrease of relative humidity. Due to the attractive force provided by sodium and chloride ion on water molecules, evaporation rate of brine droplet was smaller than pure water, therefore the evaporation rate decreased with the increase of mass concentration by showing a linear relationship. In addition, a salt shell could be formed at the outside of droplet which still contained some amount of salt solution inside. Consequently, the water molecules need to overcome the pressure difference inside and outside the salt shell, and diffuse through the shell for further evaporation. For a higher relative humidity, a more round shell would be formed during the evaporation, and the growth of crystallization along the filament is weaker than that of smaller relative humidity. We hope this study can provide a different perspective to the heat transfer community about the evaporation of brine droplet.

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Biswal, Debabrat, Bahni Ray et Debabrata DasGupta. « Stability of charged and uncharged pendant droplets at the tip of different size needles ». Dans Proceedings of the 26thNational and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference December 17-20, 2021, IIT Madras, Chennai-600036, Tamil Nadu, India. Connecticut : Begellhouse, 2022. http://dx.doi.org/10.1615/ihmtc-2021.3630.

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BISWAL, DEBABRAT, Bahni Ray, Debabrata Dasgupta, Rochish Thaokar et Y. S. Mayya. « Video : Oscillation and breaking of two charged pendant droplets with particle collection under DC electric field ». Dans 76th Annual Meeting of the APS Division of Fluid Dynamics. American Physical Society, 2023. http://dx.doi.org/10.1103/aps.dfd.2023.gfm.v0052.

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