Electrohydrodynamic inter-electrode flow and liquid jet characteristics in charge injection atomizers

Electrohydrodynamic inter-electrode flow and liquid jet characteristics in charge injection... The governing equations of electrohydrodynamics pertinent to forced and free electroconvection have been examined in the context of an array of charge injection atomization systems for dielectric electrically insulating liquids. The underlying physics defining their operation has been described further by linking the internal charge injection process inside the atomizer with resulting charged liquid jet characteristics outside it. A new nondimensional number termed the electric jet Reynolds number Re E,j is required to describe charge injection systems universally. The electric jet Reynolds number Re E,j varies linearly with the inter-electrode gap electric Reynolds number Re E, and the inter-electrode gap Reynolds number Re E varies linearly with the conventional liquid jet Reynolds number Re j. These variations yield two new seemingly universal constants relevant in the description of two-phase charge injection systems. The first constant being $$\left( {\frac{{Q_{{\text{V}}} d}}{\epsilon }} \right)\left( {\frac{1}{E}} \right)\left( {\frac{d}{L}} \right)\sim 0.06$$ Q V d ϵ 1 E d L ∼ 0.06 which physically represents the ratio of jet to inter-electrode gap electric field multipled by a nondimensional geometric factor while it may also be physically seen as a forced flow charge injection strength term, analogous to the ‘C’ term described in single-phase free electroconvection. The second constant being $$\left(\frac{\kappa E}{U_{\rm inj}}\right)\left(\frac{L}{d}\right)\sim0.6$$ κ E U inj L d ∼ 0.6 which physically represents the ratio of inter-electrode gap ionic drift velocity, to the liquid jet velocity, multipled by a nondimensional geometric factor. These scalings have been found to be valid for charge injection systems regardless of fuel, voltage pulsation, electrode shape, orifice diameter, and inter-electrode gap length. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Electrohydrodynamic inter-electrode flow and liquid jet characteristics in charge injection atomizers

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Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2014 by Springer-Verlag Berlin Heidelberg
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-014-1688-6
Publisher site
See Article on Publisher Site

Abstract

The governing equations of electrohydrodynamics pertinent to forced and free electroconvection have been examined in the context of an array of charge injection atomization systems for dielectric electrically insulating liquids. The underlying physics defining their operation has been described further by linking the internal charge injection process inside the atomizer with resulting charged liquid jet characteristics outside it. A new nondimensional number termed the electric jet Reynolds number Re E,j is required to describe charge injection systems universally. The electric jet Reynolds number Re E,j varies linearly with the inter-electrode gap electric Reynolds number Re E, and the inter-electrode gap Reynolds number Re E varies linearly with the conventional liquid jet Reynolds number Re j. These variations yield two new seemingly universal constants relevant in the description of two-phase charge injection systems. The first constant being $$\left( {\frac{{Q_{{\text{V}}} d}}{\epsilon }} \right)\left( {\frac{1}{E}} \right)\left( {\frac{d}{L}} \right)\sim 0.06$$ Q V d ϵ 1 E d L ∼ 0.06 which physically represents the ratio of jet to inter-electrode gap electric field multipled by a nondimensional geometric factor while it may also be physically seen as a forced flow charge injection strength term, analogous to the ‘C’ term described in single-phase free electroconvection. The second constant being $$\left(\frac{\kappa E}{U_{\rm inj}}\right)\left(\frac{L}{d}\right)\sim0.6$$ κ E U inj L d ∼ 0.6 which physically represents the ratio of inter-electrode gap ionic drift velocity, to the liquid jet velocity, multipled by a nondimensional geometric factor. These scalings have been found to be valid for charge injection systems regardless of fuel, voltage pulsation, electrode shape, orifice diameter, and inter-electrode gap length.

Journal

Experiments in FluidsSpringer Journals

Published: Feb 26, 2014

References

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