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

Electrohydrodynamic inter-electrode flow and liquid jet characteristics in charge injection atomizers
Electrohydrodynamic inter-electrode flow and liquid jet characteristics in charge injection atomizers
he 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 (QVd?)(1E)(dL)?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 (?EUinj)(Ld)?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.
0723-4864
1-13
Kourmatzis, A.
2e6a16aa-3a9e-42ae-8e1d-a9b7bf9d637d
Shrimpton, J. S.
9cf82d2e-2f00-4ddf-bd19-9aff443784af
Kourmatzis, A.
2e6a16aa-3a9e-42ae-8e1d-a9b7bf9d637d
Shrimpton, J. S.
9cf82d2e-2f00-4ddf-bd19-9aff443784af

Kourmatzis, A. and Shrimpton, J. S. (2014) Electrohydrodynamic inter-electrode flow and liquid jet characteristics in charge injection atomizers. Experiments in Fluids, 55 (3), 1-13. (doi:10.1007/s00348-014-1688-6).

Record type: Article

Abstract

he 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 (QVd?)(1E)(dL)?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 (?EUinj)(Ld)?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.

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More information

e-pub ahead of print date: 26 February 2014
Published date: 26 February 2014
Organisations: Engineering Science Unit

Identifiers

Local EPrints ID: 367547
URI: http://eprints.soton.ac.uk/id/eprint/367547
ISSN: 0723-4864
PURE UUID: c5210c91-23fe-4074-9ee9-1704afa13711

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Date deposited: 01 Aug 2014 11:09
Last modified: 14 Mar 2024 17:32

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Contributors

Author: A. Kourmatzis
Author: J. S. Shrimpton

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