The role of the electrical conductivity and viscosity on the motions inside Taylor cones

Barrero, Antonio; Gañán‐Calvo, Alfonso M.; Dávila, J.; Palacios, Adriana; Gómez-González, Emilio

doi:10.1016/s0304-3886(99)00021-2

Cited by 57 publications

(37 citation statements)

References 22 publications

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“…Note that the vortex flows in the cone regions have been observed experimentally [37,38] and obtained theoretically [16,39,40]. In particular, a qualitatively similar recirculating flow pattern was predicted [40] in the case of low viscosity and low bulk conductivity. However, the obtained flow fields still differ from our prediction, equation (3.15b), due to approximations on the electric field inside the cone involved in the previous studies.…”

Section: Electrohydrodynamics Of the Conesupporting

confidence: 75%

Electrohydrodynamics of stationary cone-jet streaming

Субботин

Semenov

2015

Proc. R. Soc. A.

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We discover novel types of stationary cone-jet steams emitting from a nozzle of a syringe loaded with a conductive liquid. The predicted conejet-flow geometries are based on the analysis of the electrohydrodynamic equations including the surface current. The electric field and the flow velocity field inside the cone are calculated. It is shown that the electric current along the conical stream depends on the cone angle. The stable values of this angle are obtained based on the Onsager's principle of maximum entropy production. The characteristics of the jet that emits from the conical tip are also studied. The obtained results are relevant both for the electrospraying and electrospinning processes.

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Section: Electrohydrodynamics Of the Conesupporting

confidence: 75%

Electrohydrodynamics of stationary cone-jet streaming

Субботин

Semenov

2015

Proc. R. Soc. A.

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“…This flow in excess, unable to get issued through the jet, returns back following essentially the axis line. The recirculation flow seems to be analogous to the meridional motions observed inside Taylor cones for high liquids viscosities and electrical conductivities (Barrero et al 1999). A similar feature has been experimentally observed in a two-dimensional liquid-liquid microfluidic flow focusing device (Anna and Mayer 2006).…”

Section: Introductionsupporting

confidence: 73%

Experimental and numerical study of the recirculation flow inside a liquid meniscus focused by air

Gañán‐Calvo

Ferrera

Torregrosa

et al. 2011

Microfluid Nanofluid

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The internal motions inside a liquid meniscus in the so-called liquid cone-jet mode, which can occur upon stimulation by a coflowing gas sheath in flow focusing, are explored by both numerical simulation and experimental visualization. The results for low viscosity liquids show that, as in previous numerical simulations, a recirculating cell inside the meniscus appears when the injected liquid flow rate is reduced. Thus, as the flow rate is reduced not only the average residence time of particles in the meniscus becomes longer, but the appearance of a recirculation cell provides a natural platform for the efficient micro-mixing of different species before they are ejected through the issuing jet. The numerical results were confirmed with experimental visualization of the flow inside the meniscus using a dyed liquid. However, when the viscosity of the liquid is increased the recirculating cell disappears. In this case, viscous stresses organize the streamlines and direct the flow to the meniscus tip, which prevents the recirculating cell from being formed even for very small injected rate of liquid flow.

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“…[11] In accordance with previous reports, the swirling motion in the Taylor cone was minimized at high viscosity and conductivity of the jetting solutions. [38][39][40] Specifically, a discrete interface between two polymer solutions in the Taylor cone was maintained at a DC potential in the range of 15-18 kV. Meanwhile, conductivities of the two polymer solutions were selected to be in the range of 3.5-3.8 mS Á cm…”

Section: Flow Cytometry Analysis Of Bicompartmental Particlesmentioning

confidence: 99%

Compartmentalization of Gold Nanocrystals in Polymer Microparticles using Electrohydrodynamic Co‐Jetting

Lim

Hwang

Uzun

et al. 2010

Macromol. Rapid Commun.

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Polymer particles with micro- and nanoscale anisotropy have received increasing interest for their ability to simultaneously present different physical- and chemical properties. In this communication, we demonstrate that gold nanocrystals (NCs) can be selectively incorporated into one compartment of anisotropic polymer particles. Stable bicompartmental particles were prepared via electrohydrodynamic co-jetting of aqueous nanoparticle suspensions followed by thermal cross-linking. Bicompartmental particle populations with different NC densities were obtained by varying the NC concentration in the jetting suspension. While NC-loaded polymer particles showed different optical properties depending on the NC density, they still maintained discrete interfaces between two compartments. Moreover, the fraction of the bicompartmental particles was higher than 98% based on flow cytometry. This study delineates a new approach for preparation of inorganic/organic composite particles with precisely engineered, anisotropic nanoparticle distributions and may contribute to further developments in emerging scientific areas, such as smart materials or particle-based diagnostics.

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The role of the electrical conductivity and viscosity on the motions inside Taylor cones

Cited by 57 publications

References 22 publications

Electrohydrodynamics of stationary cone-jet streaming

Electrohydrodynamics of stationary cone-jet streaming

Experimental and numerical study of the recirculation flow inside a liquid meniscus focused by air

Compartmentalization of Gold Nanocrystals in Polymer Microparticles using Electrohydrodynamic Co‐Jetting

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