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A numerical simulation of coaxial electrosprays

Published online by Cambridge University Press:  20 December 2019

Jose M. López-Herrera Open the ORCID record for Jose M. López-Herrera [Opens in a new window] ,
Miguel A. Herrada Open the ORCID record for Miguel A. Herrada [Opens in a new window] ,
Manuel Gamero-Castaño Open the ORCID record for Manuel Gamero-Castaño [Opens in a new window]  and
Alfonso M. Gañán-Calvo Open the ORCID record for Alfonso M. Gañán-Calvo [Opens in a new window]
Jose M. López-Herrera*
Affiliation:
Departmento de Ingeniería Aeroespacial y Mecánica de Fluidos, ESI, Universidad de Sevilla, Camino de los Descubrimientos s/n, 41092Sevilla, Spain
Miguel A. Herrada
Affiliation:
Departmento de Ingeniería Aeroespacial y Mecánica de Fluidos, ESI, Universidad de Sevilla, Camino de los Descubrimientos s/n, 41092Sevilla, Spain
Manuel Gamero-Castaño
Affiliation:
Department of Mechanical and Aerospace Engineering, The Henry Samueli School of Engineering, University of California Irvine, Irvine, CA92617, USA
Alfonso M. Gañán-Calvo
Affiliation:
Departmento de Ingeniería Aeroespacial y Mecánica de Fluidos, ESI, Universidad de Sevilla, Camino de los Descubrimientos s/n, 41092Sevilla, Spain
*
†Email address for correspondence: [email protected]
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Abstract

A complete electrohydrodynamic axisymmetric model of coaxial electrosprays under constant electrical permittivities and conductivities, and strict immiscibility of the liquids, is presented. The numerical solution of the model is experimentally validated, and a detailed portrait of the complex physics begotten by the large spectrum of variables involved is described in a choice of representative cases. The appearance of surface charge in both the outer and the inner free interfaces, and some of their interesting features, are revealed. Among those, the possibility of the appearance of a limited segment of opposite charge (negative, if the polarity of the applied potential is positive, or vice versa) in the inner free surface at the transition region illustrates the unexpected features exhibited by this complex system. This has fundamental physicochemical implications in the production of core–shell formulations or the use of the system in analytical chemistry, among a wide variety of applications.

JFM classification

Drops and Bubbles: Electrohydrodynamic effects Wakes/Jets: Jets
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 885 , 25 February 2020 , A15
Copyright
© 2019 Cambridge University Press

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