Experimental Study on Repetition Frequency of Drop/Jet Movement in Electro-Spraying of Deionized Water

Wang, Zhentao; Tian, Lin; Xia, L.; Dong, Jingliang; Wang, Junfeng; Tu, Jiyuan

doi:10.4209/aaqr.2017.05.0174

Cited by 10 publications

(5 citation statements)

References 43 publications

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“…Different from the aforementioned dripping and microdripping modes, where spherical droplets are released regularly, only elongated spindle-like fragments are emitted intermittently in the spindle mode. The released liquid spindle would break up into a couple of smaller droplets with various diameters due to the electrostatic forces . Images of the spindle mode at different time intervals are shown in Figures S3b and S4b for the 22G and 32G capillaries, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Easily Recycled Porous Microparticles Prepared via Electrohydrodynamic Atomization for Selective Uranium Extraction with High Capacity

Chen

Zhu

et al. 2022

ACS Sustainable Chem. Eng.

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The current study explores the potential of combining the electrohydrodynamic atomization (EHDA) technique with high-performance uranium extraction for the first time, where composite microparticles (CPs) were facilely prepared via the EHDA technique, with the particle size being precisely controlled. The precursor is made of an environmentally friendly aqueous solution of polyamidoxime and sodium alginate. Key parameters for controlling droplet size and generation frequency were determined. The generated microdroplets were collected via a coagulating bath, while transforming the droplets into hydrogel particles. The hydrogel particles were found to be uniform in size (197.1 ± 13.3 μm), with an ultrahigh generating frequency of ∼400 Hz, indicating the formation of 1.44 × 106 particles per hour. The CPs were then obtained after freeze-drying, which were characterized to be a hollow structure, with interpenetrating nanopores being observed inside the particle shell. The CPs showed superior uranium extraction performance (maximum uranium adsorption capacity of 1497.4 mg g–1 at 298 K), pre-eminent uranium selectivity, and antimicrobial properties, which can be readily recovered via sedimentation. This work offers a novel route for generating high-performance uranium adsorbents with controllable size, in a high-efficient, facile, and low-cost way, which shows great potential for sustainable uranium extraction in a commercial scale.

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Section: Resultsmentioning

confidence: 99%

“…The released liquid spindle would break up into a couple of smaller droplets with various diameters due to the electrostatic forces. 34 Images of the spindle mode at different time intervals are shown in Figures S3b and S4b for the 22G and 32G capillaries, respectively.…”

Section: ■ Experimental Methodsmentioning

confidence: 99%

Easily Recycled Porous Microparticles Prepared via Electrohydrodynamic Atomization for Selective Uranium Extraction with High Capacity

Chen

Zhu

et al. 2022

ACS Sustainable Chem. Eng.

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“…The different electro-spraying modes could be clearly observed depending on strength of electric stresses in the liquid surface relative to the surface tension force, and the kinetic energy of liquid jet leaving the nozzle. The typical modes of dripping, micro-dripping, spindle, and cone-jet in electrospraying are usually characterized according to the geometrical forms of liquid at the outlet of capillary (drop, spindle, and jet) and the types of the jet behavior of disintegration into drops (Jaworek and Krupa, 1999;Wang et al, 2017Wang et al, , 2018b.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the atomization of water adopting electrohydrodynamic (EHD) is not widely reported in the literature although the extensive studies of other liquids have been done. The time evolution of deionized water drop or/and jet initiation, pulsation, deformation, and separation from capillary tip or meniscus was captured and analyzed in detail under different spraying modes (Wang et al, 2017(Wang et al, , 2018b. The classic and corona-assisted cone-jet modes in water electro-spraying were obtained at "high" and "low" voltage levels, respectively (Tang and Gomez, 1995).…”

Section: Introductionmentioning

confidence: 99%

Experimental study of electro-spraying modes of deionized water in atmospheric environment

Wang

Jiang

et al. 2020

Exp. Comput. Multiph. Flow

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The liquid emitting from capillary subjected to a high electric voltage could be dispersed in different ways depending on applied potential and flow rate. The electro-spraying of deionized water was experimentally studied adopting the high-speed camera under different operating parameters. The time resolved images and evolution of drop or/and jet initiation, pulsation, deformation, and separation from capillary tip or meniscus were captured and analyzed. The known electro-spraying modes were identified according to the geometrical forms of meniscus, jet, or/and drop. A spherical droplet with diameter larger than the outer diameter of capillary could be generated in dripping mode at low potential, while a spherical droplet with diameter smaller than outer diameter of capillary could be observed in micro-dripping mode with relative high potential. Spindle-like droplet could be found in spindle mode and usually further disperse into a few of drops with different size for larger flow rate. In the range of applied potential and flow rate, oscillating jet and simple jet could be found, where a long jet could be elongated by electric stresses and further break up into finer drops with highly charged drops. In addition, the operating parameters and drop sizes for different modes are also discussed. Meanwhile, the spraying modes with double capillaries were also observed and discussed.

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“…The periodic dripping (PD), dripping faucet (DF), and jetting (J) regimes are classified according to the geometrical forms of the mass of liquid that is ejected from the outlet of the capillary tube [7][8][9][10]. For low flow rates, discrete and uniform drops with constant mass periodically detach from the tube, which is repetitive process that is known as the dripping regime [11,12]. For high flow rates, liquids are emitted from the tube as long jets, which typically subsequently break up into drops downstream due to Rayleigh-Plateau instability, which is called the jetting regime [13,14].…”

Section: Introductionmentioning

confidence: 99%

An experimental study on drop formation from a capillary tube

Wang

Zhang

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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The dispersal of liquid into ambient air through a tube is a common method of identical drop formation. In the present work, the regimes and dynamics of droplet and/or jet formation during ejection from a vertical capillary nozzle are experimentally studied. The time evolutions of regimes of droplet and/or jet formation are recorded using a high-speed camera. The periodic dripping (PD), dripping faucet (DF), and jetting (J) regimes of deionized (DI) water and anhydrous ethanol are clearly observed as the Weber (We = ρV 2 D/σ) number increases. In the PD regime, drops periodically detach from the end of the capillary tube due to gravity overcoming the surface tension force. The mass of the detaching drops starts to vary from periodic to quasi-periodic in the DF regime, and a continuous jet with a smooth interface is formed in the J regime. The transition from PD to J occurs with an increase in the Weber number. The DF regime is difficult to identify and observe for anhydrous ethanol due to the lower surface tension. Over a complete period of dripping, a drop gradually changes from spherical-to pear-shaped. A liquid thread connects the top portion of the drop, and the remaining liquid at the end of tube gradually forms and pinches off over time. The period of drop emission of DI water is substantially longer than that of anhydrous ethanol for a selected tube due to the larger surface tension force. The dimensionless length Z tip /D 0 continues to gradually increase with oscillations for DI water, while initially exhibiting very slight oscillations and subsequently suddenly increasing to its maximum value for ethanol. A linear relation between the period of drop emission and number of drops is identified in the PD regime. The dimensionless length of the drops increases and the dimensionless width varies minimally as the flow rate increases. The dimensionless limiting length (or thread) depends strongly on the flow rate and the tube diameter. Meanwhile, the liquid thread that connects the top portion of the droplet to the remainder of the liquid in the tube gradually thins as the tube diameter decreases, and faster narrowing was observed.

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Experimental Study on Repetition Frequency of Drop/Jet Movement in Electro-Spraying of Deionized Water

Cited by 10 publications

References 43 publications

Easily Recycled Porous Microparticles Prepared via Electrohydrodynamic Atomization for Selective Uranium Extraction with High Capacity

Easily Recycled Porous Microparticles Prepared via Electrohydrodynamic Atomization for Selective Uranium Extraction with High Capacity

Experimental study of electro-spraying modes of deionized water in atmospheric environment

An experimental study on drop formation from a capillary tube

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