Experimental study on the falling and coalescence characteristics of droplets under alternating electric fields

Sun, Yongxiang; Yang, Donghai; Sun, Huayao; Wu, Huanyu; Chang, Qing; Shi, Leicheng; Cao, Yun; He, Yan; Xie, Tengteng

doi:10.1016/j.colsurfa.2020.125136

Cited by 20 publications

(14 citation statements)

References 54 publications

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“…The structure of the experimental cell, which is similar to that used before [ 42 ], is shown in Figure 1 . To facilitate the observation of the experimental process, the cell was made of transparent Perspex.…”

Section: Experimental Set-up and Proceduresmentioning

confidence: 99%

Study on the Effect of Nanoparticle Used in Nano-Fluid Flooding on Droplet–Interface Electro-Coalescence

Yang

Sun

Chang³

et al. 2021

Nanomaterials

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Nano-fluid flooding is a new method capable of improving oil recovery; however, nanoparticles (NPs) significantly affect electric dehydration, which has rarely been investigated. The effect of silica (SiO2) NPs on the droplet–interface coalescence was investigated using a high-speed digital camera under an electric field. The droplet experienced a fall, coalescence, and secondary droplet formation. The results revealed that the oil–water interfacial tension and water conductivity changed because of the SiO2 NPs. The decrease of interfacial tension facilitated droplet deformation during the falling process. However, with the increase of particle concentration, the formed particle film inhibited the droplet deformation degree. Droplet and interface are connected by a liquid bridge during coalescence, and the NP concentration also resulted in the shape of this liquid bridge changing. The increase of NP concentration inhibited the horizontal contraction of the liquid bridge while promoting vertical collapse. As a result, it did not facilitate secondary droplet formation. Moreover, the droplet falling velocity decreased, while the rising velocity of the secondary droplet increased. Additionally, the inverse calculation of the force balance equation showed that the charge of the secondary droplet also increased. This is attributed to nanoparticle accumulation, which resulted in charge accumulation on the top of the droplet.

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Section: Experimental Set-up and Proceduresmentioning

confidence: 99%

Study on the Effect of Nanoparticle Used in Nano-Fluid Flooding on Droplet–Interface Electro-Coalescence

Yang

Sun

Chang³

et al. 2021

Nanomaterials

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“…These effects together affect the static and dynamic behavior of nanodrop wetting. 9 The wetting behavior is primarily determined by the contact angle θ , where a decrease in θ indicates the enhancement of wettability. The value of θ may be enhanced by modifying the surface material 10 or the surface weave pattern.…”

Section: Introductionmentioning

confidence: 99%

Dynamical behaviors of nanodroplets impinging on solid surfaces in the presence of electric fields

et al. 2023

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“…By exceeding the critical field strength, devastating effects like Taylor cone will appear at drop's ends and on the water-oil interface and also drops decline to coalesce with one another or with water-oil interface [5,19,[23][24][25][26][27][28]. Achieving the critical electric field depends on a variety of variables such as type of applied waveform, frequency, drop diameter, interfacial tension and some other variables [29][30][31][32][33][34]. Disadvantages of utilizing a DC electric field, such as corrosion, great energy consumption and short circuit, make using pulsatile electric field (PEF) an inevitable selection in the electro-coalescence technology.…”

Section: Introductionmentioning

confidence: 99%

“…They reported secondary droplets formation when the applied field strength exceeds a critical value beyond which the undesirable pattern of coalescence i.e., partial coalescence occurred. They found the value of critical field was highest for pulsed DC in comparison with sine AC and square electric field and concluded pulsed DC is more effective in prohibiting secondary droplets formation [42].…”

Section: Introductionmentioning

confidence: 99%

Response surface methodology for modeling of the critical electric field of a single drop subjected to different electric waveforms

Shahmoradi

Mousavi

2023

Preprint

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Electro-coalescence has been an environmentally friendly technology for decades. However, electric field strength should not exceed a critical value (Ecrit) to inhibit droplets from disintegrating during coalescence. In this study, response surface methodology (RSM) with a D-optimal design was utilized to develop a model to achieve the maximum Ecrit of a single drop. Waveform, frequency, drop diameter and interfacial tension were statistically significant. Frequency change revealed Ecrit increases with a moderate slope for all waveforms. This was attributed to less degree of drop deformation due to shorter on-time intervals of pulsatile electric field and non-compliance of drop vibration with field frequency. Following the revelation of interaction between diameter and frequency, it was observed elevated frequencies have a significant impact on larger droplets, and the sensitivity of Ecrit to the diameter decreases with frequency. This suggests higher frequencies as a useful and fast controllable variable to compensate for the effect of droplet size distribution. Optimization suggested a minimum drop diameter and a maximum frequency that can be used as two important limits for the robust design of electro-coalescers. The best and worst results in all cases corresponded to Pulse 90 and 10 waveforms respectively.

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Experimental study on the falling and coalescence characteristics of droplets under alternating electric fields

Cited by 20 publications

References 54 publications

Study on the Effect of Nanoparticle Used in Nano-Fluid Flooding on Droplet–Interface Electro-Coalescence

Study on the Effect of Nanoparticle Used in Nano-Fluid Flooding on Droplet–Interface Electro-Coalescence

Dynamical behaviors of nanodroplets impinging on solid surfaces in the presence of electric fields

Response surface methodology for modeling of the critical electric field of a single drop subjected to different electric waveforms

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