Breakup characteristics of aqueous droplet with surfactant in oil under direct current electric field

Luo, Xiaoming; Yan, Huijie; Huang, Xin; Yang, Donghai; Wang, Jing; He, Limin

doi:10.1016/j.jcis.2017.06.042

Cited by 21 publications

(17 citation statements)

References 37 publications

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“…The high voltage is supplied across the electrodes and dynamics are captured by using cameras. In these studies, some authors have also introduced surfactants at the liquid-liquid interface [ 27 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 , 84 , 85 , 86 , 87 , 88 , 89 ]. A summary of the most prominent works related to droplet EHD are summarized in Table 1 .…”

Section: Approaches Used To Study the Droplet Electrohydrodynamicsmentioning

confidence: 99%

“…The influence of interfacial properties on the droplet deformation and breakup under an electric field has also been a topic of profound interest for decades [ 27 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 , 84 , 85 , 86 , 87 ]. The surface-active molecules prompt to change in the interracial and rheological properties, leading to interfacial perturbations and breakups [ 23 , 71 , 136 , 137 , 138 ].…”

Section: Surfactant-laden Dropletsmentioning

confidence: 99%

“…The larger the deformation, larger is the increased interfacial area, leading to an increased dilution and hindering the deformation significantly. The transient deformation showed an interesting result that the droplet-stretching velocity decreased with an increase in the non-dimensional surfactant concentration (

), however, as the surfactant concentration increased beyond critical micelle concentration (

), there was no further decrease [ 27 ] (See Figure 7 B). The understanding of this dynamics is rather complex.…”

Section: Surfactant-laden Dropletsmentioning

confidence: 99%

“…( A ) Steady deformation represented by degree of stretching ( l ) vs. electric capillary number (

) at different surfactant concentrations (

). ( B ) Stretching dynamics [ 27 ]. ( C ) Breakup modes.…”

Section: Figurementioning

confidence: 99%

“…Subsequently, the validation of the model was reported, and more accurate models emerged [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ]. Recent EHD studies have explored more complex EHD interface topologies related to multiple phase emulsion droplets, and also covered the broader aspects, such as the emulsion instabilities, breakups, and particles manipulation at the emulsion interface forming novel colloidal assemblies [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ]. Though it has been almost six decades since the research in this area commenced, it is only until recently that a few studies pertaining to the droplet EHD with applicative prospects have been reported [ 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 ,…”

Section: Introductionmentioning

confidence: 99%

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Electro-Hydrodynamics of Emulsion Droplets: Physical Insights to Applications

et al. 2020

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The field of droplet electrohydrodynamics (EHD) emerged with a seminal work of G.I. Taylor in 1966, who presented the so-called leaky dielectric model (LDM) to predict the droplet shapes undergoing distortions under an electric field. Since then, the droplet EHD has evolved in many ways over the next 55 years with numerous intriguing phenomena reported, such as tip and equatorial streaming, Quincke rotation, double droplet breakup modes, particle assemblies at the emulsion interface, and many more. These phenomena have a potential of vast applications in different areas of science and technology. This paper presents a review of prominent droplet EHD studies pertaining to the essential physical insight of various EHD phenomena. Here, we discuss the dynamics of a single-phase emulsion droplet under weak and strong electric fields. Moreover, the effect of the presence of particles and surfactants at the emulsion interface is covered in detail. Furthermore, the EHD of multi-phase double emulsion droplet is included. We focus on features such as deformation, instabilities, and breakups under varying electrical and physical properties. At the end of the review, we also discuss the potential applications of droplet EHD and various challenges with their future perspectives.

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Section: Approaches Used To Study the Droplet Electrohydrodynamicsmentioning

confidence: 99%

Section: Surfactant-laden Dropletsmentioning

confidence: 99%

), however, as the surfactant concentration increased beyond critical micelle concentration (

), there was no further decrease [ 27 ] (See Figure 7 B). The understanding of this dynamics is rather complex.…”

Section: Surfactant-laden Dropletsmentioning

confidence: 99%

“…( A ) Steady deformation represented by degree of stretching ( l ) vs. electric capillary number (

) at different surfactant concentrations (

). ( B ) Stretching dynamics [ 27 ]. ( C ) Breakup modes.…”

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electro-Hydrodynamics of Emulsion Droplets: Physical Insights to Applications

et al. 2020

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Non‐coalescence behavior of neutral droplets suspended in oil under a direct current electric field

Huang

Luo

et al. 2019

AIChE Journal

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The excessive electric field gives rise to droplet non-coalescence and droplet chains in the electric dehydrator, which severely deteriorates oil-water separation efficiency and even leads to short circuit. To reveal the underlying mechanism of droplet noncoalescence, dynamic behavior of two neutral droplets in silicone oil under a direct current electric field is investigated by using high-speed photography. The experimental results show that there exists a critical electric field strength above which two droplets will bounce off after the contact. The critical electric field strength of droplet non-coalescence is affected by the initial separation distance between droplets, the radius of droplet, and the surfactant concentration. Whether the non-coalescence behavior occurs in the electric field is determined by the competition of electric force and capillary force, which dominates the evolution of tiny connection channel.

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Droplet dynamic response in low‐viscosity fluid subjected to a pulsed electric field and an alternating electric field

Huang

Luo

et al. 2019

AIChE Journal

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Droplet dynamic response in low‐viscosity fluid under a pulsed direct‐current (DC) electric field and a sinusoidal electric field is investigated by experiments and numerical simulations. The coupled level set and volume of fluid method is employed to capture moving interface and the numerical method is validated by experimental results. This article focuses on the effects of waveform, frequency and initial phase on the dynamic response. The deformation period is identical with the electric period for the pulsed DC electric field but the deformation period is half of the electric period for the sinusoidal electric field. As the frequency increases, the maximum deformation degree Dmax first climbs steadily to a peak value, then decreases steeply and finally approaches an equilibrium value. The maximum Dmax appears at f = 50 Hz for the pulsed DC electric field and appears at f = 100 Hz for the sinusoidal electric field according to numerical results. These results are helpful for the optimization of electro‐coalescence.

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Breakup characteristics of aqueous droplet with surfactant in oil under direct current electric field

Cited by 21 publications

References 37 publications

Electro-Hydrodynamics of Emulsion Droplets: Physical Insights to Applications

Electro-Hydrodynamics of Emulsion Droplets: Physical Insights to Applications

Non‐coalescence behavior of neutral droplets suspended in oil under a direct current electric field

Droplet dynamic response in low‐viscosity fluid subjected to a pulsed electric field and an alternating electric field

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