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Electro-flow focusing: the high-conductivity low-viscosity limit.

Alfonso M Gañán-Calvo1

  • 1Escuela Superior de Ingenieros, Universidad de Sevilla, Camino de los Descubrimientos, 41092 Seville, Spain. amgc@us.es

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Electro-flow focusing, a technique merging electrospray and flow focusing, achieves microjetting ranges beyond individual methods. A new model predicts microjet diameter and instability, crucial for controlling droplet size and flow rates.

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Area of Science:

  • Fluid dynamics
  • Microfluidics
  • Electrohydrodynamics

Background:

  • Electrospray (ES) and flow focusing (FF) are established microjetting techniques.
  • Each method has limitations in achieving specific microjetting parameters.
  • Combining ES and FF offers potential for enhanced control.

Purpose of the Study:

  • To develop a theoretical model for electro-flow focused microjets.
  • To predict microjet diameter, instability, and transition regimes.
  • To determine the minimum flow rate for stable jetting and smallest droplet formation.

Main Methods:

  • Development of a closed theoretical model for high electrical conductivity liquids.
  • Analysis of convective and absolute instabilities.
  • Comparison of model predictions with experimental data.

Main Results:

  • The model accurately predicts the diameter of electro-flow focused microjets.
  • Instability analysis successfully links to jetting-to-dripping transitions.
  • Minimum flow rates for steady jetting and smallest droplet sizes were determined.

Conclusions:

  • Electro-flow focusing extends microjetting capabilities beyond ES and FF alone.
  • The theoretical model provides a predictive tool for microjet behavior.
  • This technique enables precise control over droplet generation for various applications.