Direct numerical simulation of forced flow dielectric EHD within charge injection atomizers
Direct numerical simulation of forced flow dielectric EHD within charge injection atomizers
A charge injection atomizer functions by introducing electric charge discharged from a high voltage electrode into a dielectric liquid, which subsequently atomizes the ejected liquid jet. Atomizer evolution thus far has proceeded through trial and error analysis of the experimentally measured electrical characteristics of the atomizer and of the quality of atomization. Within the atomizer, a coupled space charge and electric field exist, which can alter the internal flow pattern, thus creating electrohydrodynamic (EHD) instabilities that affect atomizer operation. Such a system has not been simulated in the past under forced flow conditions. In this work we simulate the internal flow of such a charge injection device in two dimensions; using experimental based boundary conditions. Initial results indicate that in the linear injection regime defined by the experimental data, the flow is only slightly unstable but in the transitional and highly non-linear regimes, the coupled space charge and electric field produce more instability in the liquid that must be investigated further
1838-1845
Shrimpton, J.S.
9cf82d2e-2f00-4ddf-bd19-9aff443784af
Kourmatzis, Agissilaos
2e6a16aa-3a9e-42ae-8e1d-a9b7bf9d637d
December 2010
Shrimpton, J.S.
9cf82d2e-2f00-4ddf-bd19-9aff443784af
Kourmatzis, Agissilaos
2e6a16aa-3a9e-42ae-8e1d-a9b7bf9d637d
Shrimpton, J.S. and Kourmatzis, Agissilaos
(2010)
Direct numerical simulation of forced flow dielectric EHD within charge injection atomizers.
IEEE Transactions on Dielectrics and Electrical Insulation, 17 (6), .
(doi:10.1109/TDEI.2010.5658236).
Abstract
A charge injection atomizer functions by introducing electric charge discharged from a high voltage electrode into a dielectric liquid, which subsequently atomizes the ejected liquid jet. Atomizer evolution thus far has proceeded through trial and error analysis of the experimentally measured electrical characteristics of the atomizer and of the quality of atomization. Within the atomizer, a coupled space charge and electric field exist, which can alter the internal flow pattern, thus creating electrohydrodynamic (EHD) instabilities that affect atomizer operation. Such a system has not been simulated in the past under forced flow conditions. In this work we simulate the internal flow of such a charge injection device in two dimensions; using experimental based boundary conditions. Initial results indicate that in the linear injection regime defined by the experimental data, the flow is only slightly unstable but in the transitional and highly non-linear regimes, the coupled space charge and electric field produce more instability in the liquid that must be investigated further
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Published date: December 2010
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Local EPrints ID: 168913
URI: http://eprints.soton.ac.uk/id/eprint/168913
PURE UUID: 35ae8c7f-23d5-4761-8f5d-4a495940b1e5
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Date deposited: 07 Dec 2010 08:31
Last modified: 14 Mar 2024 02:18
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Author:
Agissilaos Kourmatzis
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