An experimental investigation on hydrodynamics of charged water droplets in dielectric liquid medium in the presence of electric field

Hokmabad, Babak Vajdi; Sadri, Behnam; Charan, Mehdi Rezayati; Esmaeilzadeh, E.

doi:10.1016/j.colsurfa.2012.02.043

Cited by 35 publications

(14 citation statements)

References 17 publications

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“…1 [1][2][3][4][5]. Interestingly, even though we apply just a static electric field (the field direction does not change with time), the water droplet keeps bouncing.…”

Section: Introductionmentioning

confidence: 91%

“…In Physical chemistry, the droplet contact charging phenomena was used in understanding intermolecular forces between two immiscible fluids system by measuring the interfacial tension [57] or by molecular dynamics simulation [66]. Modeling of drop/particle motion experiencing the contact charging phenomenon is one of the key subjects in this field [4][5][6]66,[74][75][76][77][78][79][80][81][82]. In microfluidics field, the direct contact charging is used to manipulate droplet [38,[83][84][85][86] or particle motions [20,75] in microchannels in addition to digital microfluidic approaches [6,23,70,77,[87][88][89].…”

Section: Historymentioning

confidence: 99%

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Next generation digital microfluidic technology: Electrophoresis of charged droplets

2015

Korean J. Chem. Eng.

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Contact charging of a conducting droplet in a dielectric medium is introduced as a novel and useful digital microfluidic technology as well as an interesting scientific phenomenon. The history of this phenomenon, starting from original observations to its interpretations and applications, is presented. The basic principle of the droplet contact charging is also presented. Several fundamental aspects of the droplet contact charging from view points of electrochemistry, surface science, electrocoalescence, and electrohydrodynamics are mentioned. Some promising results for future applications and potential features as a next generation digital microfluidic technology are discussed, especially for 3D organ printing. Finally, implications and significance of the proposed technology for chemical engineering community are discussed.

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“…1 [1][2][3][4][5]. Interestingly, even though we apply just a static electric field (the field direction does not change with time), the water droplet keeps bouncing.…”

Section: Introductionmentioning

confidence: 91%

Section: Historymentioning

confidence: 99%

Next generation digital microfluidic technology: Electrophoresis of charged droplets

2015

Korean J. Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…Hokmabad et al experimentally studied the rhythmic motion of a liquid jet with both dielectrophoresis and electrophoresis and the motion of the emanated droplets caused by jet instability in a traverse electric field [19]. The motion, deformation, and instability of charged liquid jets were examined by using a nozzle-ring electrode apparatus by Hokmabad et al [20]. A preliminary study on manipulating the trajectory of a low-pressure water jet with corresponding modeling in COMSOL was performed by Mohanty et al [21].…”

Section: Introductionmentioning

confidence: 99%

Response of High-Pressure Micro Water Jets to Static and Dynamic Nonuniform Electric Fields

Shi

Cao

Ehmann

2018

Journal of Micro and Nano-Manufacturing

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The manipulation of the trajectory of high-pressure micro water jets has the potential to greatly improve the accuracy of water jet related manufacturing processes. An experimental study was conducted to understand the basic static and dynamic responses of high-pressure micro water jet systems in the presence of nonuniform electric fields. A single electrode was employed to create a nonuniform electric field to deflect a high-pressure micro water jet toward the electrode by the dielectrophoretic force generated. The water jet's motions were precisely recorded by a high-speed camera with a 20× magnification and the videos postprocessed by a LabVIEW image processing program to acquire the deflections. The experiments revealed the fundamental relationships between three experimental parameters, i.e., voltage, pressure, and the distance between the water jet and the electrode and the deflection of the water jet in both nonuniform static and dynamic electric fields. In the latter case, electric signals at different frequencies were employed to experimentally investigate the jet's dynamic response, such as response time, frequency, and the stability of the water jet's motion. A first-order system model was proposed to approximate the jet's response to dynamic input signals. The work can serve as the basis for the development of closed-loop control systems for manipulating the trajectory of high-pressure micro water jets.

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“…Recently, the direct charging of a droplet in a dielectric medium with an electrified bare electrode has been proposed as a novel actuation method of droplets . Due to its essential merits, such as the intuitive and straightforward actuation and minimal contact with solid substrates, the direct charging method has been used in a growing number of studies .…”

Section: Introductionmentioning

confidence: 99%

Characterization of electrode alignment for optimal droplet charging and actuation in droplet‐based microfluidic system

Ahn

Yoo

et al. 2015

Electrophoresis

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The actuation method using electric force as a driving force is utilized widely in droplet-based microfluidic systems. In this work, the effects of charging electrode alignment on direct charging of a droplet on electrified electrodes and a subsequent electrophoretic control of the droplet are investigated. The charging characteristics of a droplet according to different electrode alignments are quantitatively examined through experiments and systematic numerical simulations with varying distances and angles between the two electrodes. The droplet charge acquired from the electrified electrode is directly proportional to the distance and barely affected by the angle between the two electrodes. This implies that the primary consideration of electrode alignment in microfluidic devices is the distance between electrodes and the insignificant effect of angle provides a great degree of freedom in designing such devices. Not only the droplet charge acquired from the electrode but also the force exerted on the droplet is analyzed. Finally, the implications and design guidance for microfluidic systems are discussed with an electrophoresis of a charged droplet method-based digital microfluidic device.

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An experimental investigation on hydrodynamics of charged water droplets in dielectric liquid medium in the presence of electric field

Cited by 35 publications

References 17 publications

Next generation digital microfluidic technology: Electrophoresis of charged droplets

Next generation digital microfluidic technology: Electrophoresis of charged droplets

Response of High-Pressure Micro Water Jets to Static and Dynamic Nonuniform Electric Fields

Characterization of electrode alignment for optimal droplet charging and actuation in droplet‐based microfluidic system

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