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Combined aerodynamic and electrostatic atomization of dielectric liquid jets

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Abstract

The electrical and atomization performance of a plane–plane charge injection atomizer using a dielectric liquid, and operating at pump pressures ranging from 15 to 35 bar corresponding to injection velocities of up to 50 m/s, is explored via low current electrical measurements, spray imaging and phase Doppler anemometry. The work is aimed at understanding the contribution of electrostatic charging relevant to typical higher pressure fuel injection systems such as those employed in the aeronautical, automotive and marine sectors. Results show that mean-specific charge increases with injection velocity significantly. The effect of electrostatic charge is advantageous at the 15–35 bar range, and an arithmetic mean diameter D 10 as low as 0.2d is achievable in the spray core and lower still in the periphery where d is the orifice diameter. Using the data available from this higher pressure system and from previous high Reynolds number systems (Shrimpton and Yule Exp Fluids 26:460–469, 1999), the promotion of primary atomization has been analysed by examining the effect that charge has on liquid jet surface and liquid jet bulk instability. The results suggest that for the low charge density Q v ~ 2 C/m3 cases under consideration here, a significant increase in primary atomization is observed due to a combination of electrical and aerodynamic forces acting on the jet surface, attributed to the significantly higher jet Weber number (We j) when compared to low injection pressure cases. Analysis of Sauter mean diameter results shows that for jets with elevated specific charge density of the order Q v ~ 6 C/m3, the jet creates droplets that a conventional turbulent jet would, but with a significantly lower power requirement. This suggests that ‘turbulent’ primary atomization, the turbulence being induced by electrical forces, may be achieved under injection pressures that would produce laminar jets.

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Abbreviations

a :

Orifice plate thickness (m)

C :

Empirical model coefficient

d :

Orifice diameter (m or μm)

D :

Droplet diameter (m or μm)

E :

Applied electric field (V/m)

F :

Volume flow rate (m3/s)

I L :

Leakage current (μA)

I S :

Spray current (μA)

L :

Inter-electrode gap (m or μm)

L break :

Jet break-up length (m or cm)

P :

Applied pressure (Bar)

Q v :

Spray-specific charge (C/m3)

u inj :

Liquid injection velocity (m/s)

V :

Applied voltage (volt or kilovolt)

z :

Downstream position (m or cm)

δ0 :

Perturbation scale (m)

ε:

Electrical permittivity (Farad/m)

κ:

Ionic mobility (m2/Vs)

λ:

Wavelength (nm)

Λ:

Integral length scale (m)

μ:

Dynamic viscosity (Pas)

ρ:

Density (kg/m3)

σ:

Surface tension (N/m)

τ:

Timescale (s or ms)

References

  • Alj A, Denat A, Gosse JP, Gosse B (1985) Creation of charge carriers in nonpolar liquids. IEEE Trans Electr Insul 20:221–231

    Article  Google Scholar 

  • Allen J, Ravenhill P, Shrimpton JS (2005) Spray characteristics of a novel multi orifice electrostatic atomizer. Proceedings of the 20th ILASS Europe meeting, pp 373–377

  • Atten P (1996) Electro hydrodynamic instability and motion induced by injected space charge in insulating liquids. IEEE Trans Dielectr Electr Insul 3:1–17

    Article  Google Scholar 

  • Bankston CP, Back LH, Kwack EY, Kelly AJ (1988) Experimental investigation of electrostatic dispersion and combustion of diesel fuel jets. J Eng Gas Turbines Power 110:361–368

    Article  Google Scholar 

  • Castellanos A (1991) Coulomb-driven convection in electro hydrodynamics. IEEE Trans Electr Insul 26:1201–1215

    Article  Google Scholar 

  • Castellanos A (1998) Electrohydrodynamics, 1st edn. Springer, New York

    MATH  Google Scholar 

  • Faeth GM, Hsiang LP, Wu PK (1995) Structure and break-up properties of sprays. Int J Multiphase Flow 21:99–127

    Article  MATH  Google Scholar 

  • Gomez A, Tang K (1994) Charge and fission of droplets in electrostatic sprays. Phys Fluids 6:404–414

    Article  Google Scholar 

  • Grant RP, Middleman S (1966) Newtonian jet stability. Am Inst Chem Eng J 12:669–678

    Article  Google Scholar 

  • Jaworek A, Krupa A (1999) Jet and drops formation in electro hydrodynamic spraying of liquids. A systematic approach. Exp Fluids 27:43–52

    Article  Google Scholar 

  • Kelly AJ (1984) The electrostatic atomization of hydrocarbons. J Inst Energy 57:312–320

    Google Scholar 

  • Kim K, Turnbull RJ (1976) Generation of charged drops of insulating liquids by electrostatic spraying. J Appl Phys 47:1964–1969

    Article  Google Scholar 

  • Kourmatzis A, Shrimpton JS (2011) Electrical and transient atomization characteristics of a pulsed charge injection atomizer. J Electrostat 69:157–167

    Article  Google Scholar 

  • Kourmatzis A, Shrimpton JS (2012) Turbulent three dimensional dielectric electrohydrodynamic (EHD) convection between two plates. J Fluid Mech (in press)

  • Kourmatzis A, Allen J, Shrimpton JS (2010) Electrical and spray characteristics of a multiorifice charge-injection atomizer for electrically insulating liquids. Atomization Spray 20:269–280

    Article  Google Scholar 

  • Kwack EY, Back LH, Bankston CP (1989) Electrostatic dispersion of diesel fuel jets at high back pressure. ASME Trans 111:578–586

    Article  Google Scholar 

  • Kyritsis DC, Coriton B, Faure F, Roychoudhury S, Gomez A (2004) Optimization of a catalytic combustor using electrosprayed liquid hydrocarbons for mesoscale power generation. Combust Flame 139:539–563

    Article  Google Scholar 

  • Lefebvre AH (1989) Atomization and sprays. Taylor and Francis, New York

    Google Scholar 

  • Li L, Yu S, Hu Z (2006) Theoretical and experimental studies of electrospray for IC engine. Society for Automotive Engineers pp 139–147

  • Malkawi G (2010) Point-to-plane and plane-to-plane electrostatic charge atomization for insulating liquids, PhD Thesis, University of Illinois at Chicago, Chicago

  • Marginean I, Znamensiy V, Vertes A (2006) Charge reduction in electrosprays: slender nanojets as intermediates. J Phys Chem B 110:6397–6404

    Article  Google Scholar 

  • Melcher RJ (1981) Continuum electromechanics. MIT press, Cambridge

    Google Scholar 

  • Ohnesorge W (1936) Formation of drops by nozzles and the break-up of liquid jets. Zeitschrift fur Angewandte Mathematik und Mechanik 16:355–358

    Article  Google Scholar 

  • Rayleigh L (1878) On the instability of jets. Proc Lond Math Soc 10:4–13

    Article  Google Scholar 

  • Rigit ARH, Shrimpton JS (2006a) Electrical performance of charge injection electrostatic atomizers. Atomization Spray 16:401–419

    Article  Google Scholar 

  • Rigit ARH, Shrimpton JS (2006b) Spray characteristics of charge injection electrostatic atomizers with small orifice diameters. Atomization Spray 16:421–442

    Article  Google Scholar 

  • Schneider JM, Watson PK (1970) Electrohydrodynamic instability of space-charge-limited currents in dielectric liquids, i. theoretical study. Phys Fluids 18:1948–1954

    Article  Google Scholar 

  • Shrimpton JS (1995) Electrostatic atomization and combustion of hydrocarbon oils, PhD Thesis, University of Manchester, Manchester, UK

  • Shrimpton JS, Laoonual Y (2006) Dynamics of electrically charged transient evaporating sprays. Int J Numer Methods Eng 67:1063–1081

    Article  MATH  Google Scholar 

  • Shrimpton JS, Yule AJ (1995) Atomization, combustion, and control of charged hydrocarbon sprays. Atomization Spray 11:1–32

    Google Scholar 

  • Shrimpton JS, Yule AJ (1999) Characterization of charged hydrocarbon sprays for application in combustion systems. Exp Fluids 26:460–469

    Article  Google Scholar 

  • Shrimpton JS, Yule AJ (2003) Electrohydrodynamics of charge injection atomization: regimes and fundamental limits. Atomization Spray 12:173–190

    Article  Google Scholar 

  • Shrimpton JS, Yule AJ (2004) Design issues concerning charge injection atomizers. Atomization Spray 14:127–142

    Article  Google Scholar 

  • Weber C (1931) Disintegration of liquid jets. Zeitschrift fur Angewandte Mathematik und Mechanik 11:136–159

    Article  MATH  Google Scholar 

  • Wu PK, Miranda RF, Faeth GM (1995) Effects of initial flow conditions on primary break-up of nonturbulent and turbulent round liquid jets. Atomization Spray 5:175–196

    Google Scholar 

  • Yoon SS, Heister SD (2003) Categorizing linear theories for atomizing round jets. Atomization Spray 13:499–516

    Article  Google Scholar 

  • Yoon SS, Heister SD (2004) A nonlinear atomization model based on a boundary layer instability mechanism. Phys Fluids 16:47–61

    Article  MathSciNet  Google Scholar 

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Acknowledgments

The authors thank Spraying Systems Co. for lending us the Zenith high-pressure pump for the electrical measurements. Thanks also go to the world universities network (WUN) for funding the trip to the United States which allowed for this work to be undertaken.

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Authors and Affiliations

  1. Clean Combustion Research Group, Aerospace, Mechanical and Mechatronic Engineering, University of Sydney, Sydney, NSW, 2006, Australia

    Agissilaos Kourmatzis

  2. Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL, 60607, USA

    Egemen L. Ergene & Farzad Mashayek

  3. Energy Technology Research Group, School of Engineering Sciences, University of Southampton, Southampton, SO171BJ, UK

    John S. Shrimpton

  4. Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA

    Dimitrios C. Kyritsis & Ming Huo

Authors
  1. Agissilaos Kourmatzis
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  2. Egemen L. Ergene
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  3. John S. Shrimpton
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  4. Dimitrios C. Kyritsis
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  5. Farzad Mashayek
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  6. Ming Huo
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Correspondence to John S. Shrimpton.

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Kourmatzis, A., Ergene, E.L., Shrimpton, J.S. et al. Combined aerodynamic and electrostatic atomization of dielectric liquid jets. Exp Fluids 53, 221–235 (2012). https://doi.org/10.1007/s00348-012-1284-6

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  • DOI: https://doi.org/10.1007/s00348-012-1284-6

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