Droplet Formation in Liquid/Liquid Systems Using High Frequency AC Fields

Gneist, G.; Bart, Hans‐Jörg

doi:10.1002/1521-4125(200202)25:2<129::aid-ceat129>3.0.co;2-8

Cited by 9 publications

(8 citation statements)

References 4 publications

(4 reference statements)

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“…In our experiments the high voltage power supply (FG2±2, Ahlbrandt System GmbH) was operated between 0 kV and 4 kV (45 kHz). In this range the reduction of drop size is strongest [1]. In all experiments the flow rate was kept constant at 0.05 mL/min and the temperature at 298 K. The conductivity was adjusted by adding NaCl to the aqueous phase.…”

Section: Methodsmentioning

confidence: 99%

“…In all tests the voltage, current and frequency were measured. The drop sizes were determined using an optical double flash system (Nanolite/Ministrobokin, HSPS) [1]. The physical properties of the liquids used are listed in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…The formation of monodispersed aqueous or organic drops in liquid/liquid systems is possible using electrostatic fields [1]. Here, the applied voltage and thus the electric field at the capillary tip is the most significant parameter.…”

Section: Introductionmentioning

confidence: 99%

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Electrostatic Drop Formation in Liquid/Liquid Systems

Gneist

Bart²

2002

Chem. Eng. Technol.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Electrostatic Drop Formation in Liquid/Liquid Systems

Gneist

Bart²

2002

Chem. Eng. Technol.

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“…Besides of the practical applications, there is also significant theoretical interest in such kind of phenomena, in particular, as to a new type of electrohydrodynamic instability. Experiments with droplets and jets in such fields were recently performed in papers (Yeo et al 2004;Gneist and Bart 2002;Malloggi et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Instability of Slender Liquid Jet in AC Electric Field of Arbitrary Frequency

Demekhin

Polyanskikh

2010

Microgravity Sci. Technol.

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In the present work stability of capillary micro-jet of electrolyte solution in alternating longitudinal electric field is investigated theoretically. The gravity effects are neglected. The problem is described by strongly coupled nonlinear system of PDEs for ion transport, electric field and fluid flow under assumption of a viscous Newtonian liquid. The Debye layer thickness is supposed to be small compared with initial jet radius. The Peclet number based on the Debye layer thickness is assumed to be small. These assumptions lead to substantial simplification of the problem. Slender-body theory is used to further simplification of initial statement. Used asymptotic method allows to reduce initially infinite system to three-dimensional ODE with time-periodic coefficients. It is shown that monodromy operator has the only real unstable multiplier. In the case of high-frequency alternating electric field the results showed good agreement with the ones provided by averaging theory.

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“…Microdroplets are formed by various phenomena such as acoustic levitation (Omrane et al 2004), thermal evaporation of thin films (Govor et al 2005), chemical patterning microchannels (Kuksenok et al 2003), atmospheric corrosion (Tsuru et al 2004), electric field dispersion (Gneist and Bart 2002), electrowetting (Wheeler et al 2004), interfacial tension driven (Sugiura et al 2001) and shear driven flow (Nisisako et al 2002;Tan et al 2006). Particularly, microfluidics based droplets are being explored due to their applications for bioassays (Srinivasan et al 2004), synthesizing nanoparticles (Dendukuri et al 2005) cell encapsulation in alginate beads (Sugiura et al 2005) and protein crystallization (Chen et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Control of serial microfluidic droplet size gradient by step-wise ramping of flow rates

Collins

Lee

2006

Microfluid Nanofluid

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This paper describes a method to control and detect droplet size gradient by step-wise flow rate ramping of water-in-oil droplets in a microfluidic device. The droplets are generated in a cross channel device with two oil inlets and a water inlet. The droplet images are captured and analyzed in a time sequence in order to quantify the droplet generation frequency. It is demonstrated that by controlling the ramping of the oil flow rates it is possible to manipulate the ramping of droplet sizes. Increasing or decreasing of droplet sizes is achieved for a step-wise triangular ramping profile of the oil flow rate. The dynamic behavior of droplets due to the step-wise flow pulses is investigated. Uniform linear size ramping of water-in-oil droplets from 73 to 83 lm in diameter is generated with an oil flow ramping range from 1 to 11 lL/min in a minimum of five steps while water flow rate is held constant at 2 lL/min.

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Droplet Formation in Liquid/Liquid Systems Using High Frequency AC Fields

Cited by 9 publications

References 4 publications

Electrostatic Drop Formation in Liquid/Liquid Systems

Electrostatic Drop Formation in Liquid/Liquid Systems

Instability of Slender Liquid Jet in AC Electric Field of Arbitrary Frequency

Control of serial microfluidic droplet size gradient by step-wise ramping of flow rates

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