Skip to main content
SpringerLink
Log in

Transient analysis of intermittent multijet sprays

  • Research Article
  • Published:
Experiments in Fluids Aims and scope Submit manuscript

Abstract

This paper analyzes the transient characteristics of intermittent sprays produced by the single-point impact of multiple cylindrical jets. The aim is to perform a transient analysis of the intermittent atomization process to study the effect of varying the number of impinging jets in the hydrodynamic mechanisms of droplet formation. The results evidence that hydrodynamic mechanisms underlying the physics of ligament fragmentation in 2-impinging jets sprays also apply to sprays produced with more than 2 jets during the main period of injection. Ligaments detaching from the liquid sheet, as well as from its bounding rim, have been identified and associated with distinct droplet clusters, which become more evident as the number of impinging jets increases. Droplets produced by detached ligaments constitute the main spray, and their axial velocity becomes more uniformly distributed with 4-impinging jets because of a delayed ligament fragmentation. Multijet spray dispersion patterns are geometric depending on the number of impinging jets. Finally, an analysis on the Weber number of droplets suggests that multijet sprays are more likely to deposit on interposed surfaces, thus becoming a promising and competitive atomization solution for improving spray cooling.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8
Fig. 9
Fig. 10
Fig. 11
Fig. 12
Fig. 13
Fig. 14

Similar content being viewed by others

References

  • Abo-Serie E, Gavaises M, Arcoumanis C (2003) Spray/wall interaction in direct-injection spark ignition engines equipped with multi-hole injectors. In: Proceedings of the 9th internation conference on liquid atomization and spray systems, Sorrento, Italy

  • Anderson W, Ryan S, Santoro R (1993) Spray formation processes of impinging jet injectors. NASA Prop Eng Res C 2:69–74

    Google Scholar 

  • Bai C, Rusche H, Gosman A (2002) Modeling of gasoline spray impingement. Atom Sprays 12:1–27

    Article  Google Scholar 

  • Bremond N, Villermaux E (2006) Atomization by jet impact. J Fluid Mech 549:273–306

    Article  Google Scholar 

  • Bush J, Hasha A (2004) On the collision of laminar jets: fluid chains and fishbones. J Fluid Mech 511:285–310

    Article  MathSciNet  MATH  Google Scholar 

  • Choo Y, Kang B (2003) A study on the velocity characteristics of the liquid elements produced by two impinging jets. Exp Fluids 34:655–661

    Article  Google Scholar 

  • Dombrowski N, Hooper P (1964) A study of the sprays formed by impinging jets in laminar and turbulent flow. J Fluid Mech 18:392–400

    Article  MATH  Google Scholar 

  • Dombrowski N, Johns W (1963) The aerodynamic instability and disintegration of viscous liquid sheets. Chem Eng Sci 17:291–305

    Google Scholar 

  • Durão D, Moreira A, Panão M (2006) The effect of a cross-flow on secondary atomization in multipoint fuel injection systems. In Proceedings of the 13th international symposium applications of laser techniques to fluid mechanics, Lisbon, Portugal

  • Gadgil H, Raghunandan B (2009) Effect of skewness on the characteristics of impinging jet atomizers. Atom Sprays 19:1–18

    Article  Google Scholar 

  • Hardalupas Y, Okamoto S, Taylor A, Whitelaw J (1992) Application of a phase doppler anemometer to a spray impinging on a disc. In: Proceedings of the 6th international symposium applications of laser techniques to fluid mechanics, Lisbon, Portugal, Springer pp 490–506

  • Ibrahim E, Outland B (2008) A non-linear model for impinging jets atomization. Proc IMechE 222:213–224

    Article  Google Scholar 

  • Li R, Ashgriz N (2006) Characteristics of liquid sheets formed by two impinging jets. Phys Fluids 18:087104

    Article  Google Scholar 

  • Naber J, Reitz R (1989) Modeling engine spray/wall impingement. SAE Technical Paper 880107, SAE Transactions 97:847–869

  • Panão M, Moreira A (2004) Experimental study of the flow regimes resulting from the impact of an intermittent gasoline spray. Exp Fluids 37:834–855

    Article  Google Scholar 

  • Panão M, Moreira A (2008) A real-time assessment of measurement uncertainty in the experimental characterization of sprays. Meas Sci Tech 19:095402

    Article  Google Scholar 

  • Panão M, Moreira A (2008b) Secondary atomization characteristics in intermittent spray cooling. In: 22nd annual conference on liquid atomization and spray systems, Como, Italy

  • Panão M, Rosa J, Moreira A (2009) Multijet spray characteristics for spray cooling. In: Proceedings of the 11th international conference liquid atom and spray systems, Colorado, USA

  • Panão M, Moreira A, Durão D (2011) Thermal-fluid assessment of multijet atomization for spray cooling applications. Energy 36:2302–2311

    Article  Google Scholar 

  • Roisman I, Gambaryan-Roisman T, Kyriopoulos O, Stephan P, Tropea C (2007) Breakup and atomization of a stretching crown. Phys Rev E 76:026302

    Article  Google Scholar 

  • Senecal P, Schmidt D, Nouar I, Rutland C, Reitz R, Corradini M (1999) Modeling high-speed viscous liquid sheet atomization. Int J Multiphase Flow 25:1073–1097

    Article  MATH  Google Scholar 

  • Villermaux E (2007) Fragmentation. Annu Rev Fluid Mech 39:419–446

    Article  MathSciNet  Google Scholar 

  • Villermaux E, Clanet C (2002) Life of a flapping liquid sheet. J Fluid Mech 462:341–363

    Article  MathSciNet  MATH  Google Scholar 

  • Weber C (1931) On the breakdown of a fluid jet. Z A M P 11:136–159

    MATH  Google Scholar 

Download references

Acknowledgments

The authors would like to acknowledge Fundação para a Ciência e Tecnologia (FCT) for the financial support through project PTDC/EME-MFE/099040/2008. Miguel Oliveira Panão would also like to acknowledge FCT for supporting his research through fellowship SFRH/BPD/45170/2008.

Author information

Authors and Affiliations

  1. IN+, Center for Innovation, Technology and Policy Research, Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco Pais, 1049-001, Lisboa, Portugal

    Miguel R. Oliveira Panão & António Luis N. Moreira

  2. Universidade Lusíada, Rua da Junqueira, 188-198, 1349-001, Lisboa, Portugal

    Diamantino G. Durão

Authors
  1. Miguel R. Oliveira Panão
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. António Luis N. Moreira
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Diamantino G. Durão
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Miguel R. Oliveira Panão.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Panão, M.R.O., Moreira, A.L.N. & Durão, D.G. Transient analysis of intermittent multijet sprays. Exp Fluids 53, 105–119 (2012). https://doi.org/10.1007/s00348-011-1234-8

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s00348-011-1234-8

Keywords

Search

Navigation