Turbulent mixing in a barbed plate-to-plate electrostatic precipitator

Davidson, Jane H.; McKinney, P.J.

doi:10.1016/0004-6981(89)90171-6

Cited by 17 publications

(4 citation statements)

References 12 publications

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“…The area has a number of industrial applications that range from electrostatic spraying (Kim & Turnbull 1976;Kelly 1984;Bailey 1986;Bankston et al 1988;Lehr & Hiller 1993;Balachandran et al 1999;Ye, Domnick & Pulli 2005) to electrostatic precipitators (Davidson & McKinney 1989, 1991Yamamoto et al 2006). Here, discussion is restricted to pure isothermal dielectric liquids, where charged dipoles and monopoles are separated by neutral entities (Crowley 1999) and electric charge may reside for relatively long periods in the liquid volume.…”

Section: Introductionmentioning

confidence: 97%

“…A more common example of a charge-laden dielectric fluid is air in electrostatic precipitators (ESP), where corona-laden air and imposed electric fields charge unwanted particles and remove them from a dusty gas flow (Davidson & McKinney 1989, 1991Yamamoto et al 2006). Although the governing equations pertaining to flow of electrically charged air, such as in an ESP, are the same as for systems containing dielectric liquids there are distinct differences.…”

Section: Introductionmentioning

confidence: 98%

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Turbulent three-dimensional dielectric electrohydrodynamic convection between two plates

Kourmatzis

Shrimpton

2012

J. Fluid Mech.

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The fundamental mechanisms responsible for the creation of electrohydrodynamically driven roll structures in free electroconvection between two plates are analysed with reference to traditional Rayleigh-Bénard convection (RBC). Previously available knowledge limited to two dimensions is extended to three-dimensions, and a wide range of electric Reynolds numbers is analysed, extending into a fully inherently three-dimensional turbulent regime. Results reveal that structures appearing in threedimensional electrohydrodynamics (EHD) are similar to those observed for RBC, and while two-dimensional EHD results bear some similarities with the three-dimensional results there are distinct differences. Analysis of two-point correlations and integral length scales show that full three-dimensional electroconvection is more chaotic than in two dimensions and this is also noted by qualitatively observing the roll structures that arise for both low (Re E = 1) and high electric Reynolds numbers (up to Re E = 120). Furthermore, calculations of mean profiles and second-order moments along with energy budgets and spectra have examined the validity of neglecting the fluctuating electric field E i in the Reynolds-averaged EHD equations and provide insight into the generation and transport mechanisms of turbulent EHD. Spectral and spatial data clearly indicate how fluctuating energy is transferred from electrical to hydrodynamic forms, on moving through the domain away from the charging electrode. It is shown that E i is not negligible close to the walls and terms acting as sources and sinks in the turbulent kinetic energy, turbulent scalar flux and turbulent scalar variance equations are examined. Profiles of hydrodynamic terms in the budgets resemble those in the literature for RBC; however there are terms specific to EHD that are significant, indicating that the transfer of energy in EHD is also attributed to further electrodynamic terms and a strong coupling exists between the charge flux and variance, due to the ionic drift term.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 98%

Turbulent three-dimensional dielectric electrohydrodynamic convection between two plates

Kourmatzis

Shrimpton

2012

J. Fluid Mech.

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“…A paper by Podlinski et al (2008) examines what e↵ect a pulsed voltage superimposed on to a DC voltage has on the roll structures attained, using PIV (particle image velocimetry). The research revealed that a voltage pulse train aids in the creation of roll structures, which is a desired phenomenon for an ESP (Davidson and McKinney (1989); Yamamoto et al (2006)). The reader should note however that in ESPs, air is the driven fluid, which has a larger charge mobility value than the dielectric liquid we consider here.…”

Section: List Of Symbolsmentioning

confidence: 99%

Electrical and transient atomization characteristics of a pulsed charge injection atomizer using electrically insulating liquids

Kourmatzis

Shrimpton

2011

Journal of Electrostatics

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Charge injection atomizers are energy e cient devices that can be used in order to promote the atomization of dielectric liquids, and a potential application of such devices is fine spray delivery in small internal combustion engines. The operation of a pulsed charge injection atomization system operating at practical engine frequencies under a high voltage pulse train has not been well recorded in the literature. This initial investigation defines the electrical and transient global atomization performance of a charge injection atomizer operating under a steady flow regime, but with a typical high voltage pulse train. Results show that voltage-current characteristics follow similar trends to that of a steady flow, steady voltage system, and observation of the data also reveals that output current waveforms depend on the input pulse train frequency. No degradation in charging e ciency was observed at higher frequencies, which suggests that a charge injection atomizer can operate e ciently at practical engine speeds. Photographs also confirmed the high voltage pulse train injects charge that produces sections of primary atomization on the continuous liquid jet.

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“…The eld has numerous indust rial applicat ions t hat range from heat t ransfer enhancement [3,4], elect rost at ic spraying applicat ions [5,6,7,8], and elect rost at ic precipit at ors [9,10,11]. Here, discussion is rest rict ed t o dielect ric liquids, where charged dipoles and monopoles are separat ed by neut ral ent it ies [12], and elect ric charge resides in t he liquid volume.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of electrohydrodynamic roll structures in laminar planar Couette flow

Kourmatzis¹,

Shrimpton²

2015

J. Phys. D: Appl. Phys.

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A bst r act .T he behaviour of an incompressible dielect ric liquid subject ed t o a laminar planar Couet t e ow wit h unipolar charge inject ion is invest igat ed numerically in two dimensions. T he comput at ions show new morphological charact erist ics of roll st ruct ures t hat arise in t his forced elect ro-convect ion problem. T he charge and velocity magnit ude dist ribut ions between t he two parallel elect rodes are discussed as a funct ion of t he t op wall velocity and t he EHD Rayleigh number, T for t he case of st rong charge inject ion. A wide enough paramet ric space is invest igat ed such t hat t he observed EHD roll st ruct ures progress t hrough t hree regimes. T hese regimes are de ned by t he presence of a single or double-roll free convect ive st ruct ure as observed elsewhere [1], a sheared or st ret ched roll st ruct ure, and nally by a regime where t he perpendicular velocity gradient is su cient t o prevent t he generat ion of a roll. T hese t hree regimes have been delineat ed as a funct ion of t he wall t o ionic drift velocity U W = E , and t he T number. In t he st ret ched regime, an increase in U W = E can reduce charge and moment um uct uat ions whilst in parallel de-st rat ify charge in t he region between t he two elect rodes. T he st ret ched roll regime is also charact erised by a subst ant ial in uence of U W = E on t he st eady development t ime, however in t he t radit ional non-st ret ched roll st ruct ure regime, no in uence of U W = E on t he development t ime is not ed.

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Turbulent mixing in a barbed plate-to-plate electrostatic precipitator

Cited by 17 publications

References 12 publications

Turbulent three-dimensional dielectric electrohydrodynamic convection between two plates

Turbulent three-dimensional dielectric electrohydrodynamic convection between two plates

Electrical and transient atomization characteristics of a pulsed charge injection atomizer using electrically insulating liquids

Characteristics of electrohydrodynamic roll structures in laminar planar Couette flow

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