Discrete electric field mediated droplet splitting in microchannels: Fission, Cascade, and Rayleigh modes

Chaudhuri, Joydip; Timung, Seim; Dandamudi, Chola Bhargava; Mandal, Tapas Kumar; Bandyopadhyay, Dipankar

doi:10.1002/elps.201600276

Cited by 30 publications

(12 citation statements)

References 78 publications

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“…The coupling between the hydrodynamics and electric field has been performed by integrating the Maxwell's stresses in the governing equations and in the boundary conditions. The finite difference, finite element, or finite volume methods coupled with the volume‐of‐fluid, volume of fluid coupled with level‐set , Lattice‐Boltzmann , or phase field methods were employed to solve the entire system of transport equations with appropriate boundary conditions to uncover the spatiotemporal dynamics of the two‐phase systems.…”

Section: Introductionmentioning

confidence: 99%

Electric field mediated spraying of miniaturized droplets inside microchannel

et al. 2016

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We report a facile and noninvasive way to disintegrate a microdroplet into a string of further miniaturized ones under the influence of an external electrohydrodynamic field inside a microchannel. The deformation and breakup of the droplet was engendered by the Maxwell's stress originating from the accumulation of induced and free charges at the oil-water interface. While at smaller field intensities, for example less than 1 MV/m, the droplet deformed into a plug, at relatively higher field intensities, e.g. ∼1.16 MV/m, a pair of droplets having opposite surface charge was formed. The charged droplets showed an interesting periodic bridging and breakup during their translation motion across the channel. For even higher field intensities, for example more than 1.2 MV/m, the entire droplet underwent dielectrophoresis toward one of the electrodes before experiencing a strong attractive force from the other electrode to deform into a shape of a Taylor cone. With progress in time, mimicking the electrospraying phenomenon, the cone tip periodically ejected a string of miniaturized water droplets to form a microemulsion inside the channel. The frequency and size of the droplet ejection could be tuned by varying the applied field intensity. A water droplet of ∼214 μm diameter could continuously eject droplets of size ∼10 μm or even smaller to form a microemulsion inside the channel.

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Section: Introductionmentioning

confidence: 99%

Electric field mediated spraying of miniaturized droplets inside microchannel

et al. 2016

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“…Force density due to this electrostatic interaction can be found from the Maxwell stress tensor (

\bar{\bar{M}}

) as

{\overset{F}{true}}_{elec} = \nabla \cdot \bar{\bar{M}} = \nabla \cdot ε (\bar{E} \bar{E} - \frac{1}{2} {(||, \bar{E})}^{2} \bar{I})

where ε is the permittivity of the media and

\overset{I}{true}

is a unit tensor . The electric field driven flow field can be described using the incompressible Navier‐Stokes equations and continuity equation as

ρ (\frac{\partial \bar{u}}{\partial t} + (\bar{u} \cdot \nabla) \bar{u}) = - \nabla p + μ \nabla^{2} \bar{u} + {\overset{B}{true}}_{normalF} (\bar{x}, t)

\nabla \cdot \bar{u} = 0

where

\overset{u}{true}

is the local velocity, µ is the fluid viscosity, ρ is the density, and

{\overset{B}{true}}_{F} false(\bar{x}, t false)

is the body force density acting on the fluid.…”

Section: Mathematical Modelmentioning

confidence: 99%

Electrophoretic transport and dynamic deformation of bio‐vesicles

2019

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DOI: https://doi.org/10.1002/elps.201900025 The cover picture shows the cutaway section of a solid state nanopore with a vesicle in the process of translocation. Electric field lines converge at the nanopore creating a highly magnified region which physically deforms soft vesicles as they pass through due to electrophoresis. Current measurements inside the nanopore with and without vesicles are shown in the bottom‐right while variation in the amplitude of current with changing vesicle shape is shown in the top‐right corner.

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“…Active control methods have been used in these devices to manipulate the formation of droplets. One of the most successful methods (Link et al 2006;Yoon et al 2014) uses an AC electric field to induce change in the droplet size (Chaudhuri et al 2017;Malloggi et al 2007;Yeo et al 2004). The application of this form of external energy has also been previously utilised for droplet sorting (Baret et al 2009), merging (Thiam et al 2009), deformation (Xi et al 2016), injection (Abate et al 2013), and generation (Huang et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Controllable droplet generation at a microfluidic T-junction using AC electric field

Teo

Yan

Dong

et al. 2020

Microfluid Nanofluid

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We investigated the influence of an alternate current (AC) electric field on droplet generation in a Tjunction device. We used sodium chloride solution with various conductivities to adjust the response time of the fluidic system. At constant flow rates of both continuous and dispersed phases, the critical parameters for the droplet formation process are the magnitude, the frequency of the applied voltage and the conductivity of the dispersed phase. The response of the droplet formation process to AC excitation is characterised by the relative area of the formed droplet. The relative response time of the fluidic system to the applied AC voltage is characterised by the relative response time that is proportional to the ratio of the AC frequency to the conductivity of the dispersed phase. An accurate prediction of the breakdown voltage for the walls also proved robustness of our model. Furthermore, experiments were repeated with 0.5 g/L and 1 g/L xanthan gum solutions as non-Newtonian fluids.The results reveal the negligible influence of viscoelasticity on the droplet formation process. Ondemand size controllable generation of non-Newtonian droplets is subsequently demonstrated following the same trend of the Newtonian counterparts.

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Discrete electric field mediated droplet splitting in microchannels: Fission, Cascade, and Rayleigh modes

Cited by 30 publications

References 78 publications

Electric field mediated spraying of miniaturized droplets inside microchannel

Electric field mediated spraying of miniaturized droplets inside microchannel

Electrophoretic transport and dynamic deformation of bio‐vesicles

Controllable droplet generation at a microfluidic T-junction using AC electric field

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