Analysis of viscous fluid flow in a pressure-swirl atomizer using large-eddy simulation

E. Laurila*, J. Roenby, V. Maakala, P. Peltonen, H. Kahila, V. Vuorinen

*Corresponding author

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A computational fluid dynamics study is carried out on the inner nozzle flow and onset of liquid sheet instability in a large-scale pressure-swirl atomizer with asymmetric inflow configuration for high viscosity fluids. Large-eddy simulations (LES) of the two-phase flow indicate the unsteady flow character inside the nozzle and its influence on liquid sheet formation. A novel geometric volume-of-fluid (VOF) method by Roenby et al. (2016), termed isoAdvector, is applied for sharp interface capturing. We carry out a Reynolds number sweep (420 ≤ Re ≤ 5300) in order to investigate the link between the asymmetric inner nozzle flow and liquid sheet characteristics in laminar, transitional and fully turbulent conditions. Inside the nozzle, the numerical simulations reveal counter-rotating Dean vortices, flow impingement locations, and strong asymmetric flow features at all investigated Reynolds numbers. A helical, rotating gaseous core is observed when Re ≥ 1660. For laminar flow (Re=420), an S-shaped liquid film is observed, while the gas core presence at Re ≥ 1660 results in a hollow cone liquid sheet. For the intermediate value Re=830, the numerical simulations indicate a liquid sheet of mixed type. Consequences of the inflow asymmetry and Reynolds number to the uniformity of the injected liquid mass distribution and liquid sheet instability are pointed out.

Original languageEnglish
JournalInternational Journal of Multiphase Flow
Volume113
Pages (from-to)371-388
Number of pages18
ISSN0301-9322
DOIs
Publication statusPublished - 1 Apr 2019

Fingerprint

atomizers
Atomizers
Large eddy simulation
viscous fluids
large eddy simulation
Viscous flow
fluid flow
Liquids
liquids
Nozzles
Reynolds number
nozzle flow
nozzles
Fluids
Computer simulation
Liquid films
Unsteady flow
impingement
fluids
Laminar flow

Keywords

  • Hollow cone spray
  • isoAdvector
  • Large-eddy simulation
  • LES
  • Pressure-swirl atomizer
  • Primary atomization
  • Two-phase flow
  • VOF
  • Volume-of-fluid method

Cite this

Laurila, E. ; Roenby, J. ; Maakala, V. ; Peltonen, P. ; Kahila, H. ; Vuorinen, V. / Analysis of viscous fluid flow in a pressure-swirl atomizer using large-eddy simulation. In: International Journal of Multiphase Flow. 2019 ; Vol. 113. pp. 371-388.
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abstract = "A computational fluid dynamics study is carried out on the inner nozzle flow and onset of liquid sheet instability in a large-scale pressure-swirl atomizer with asymmetric inflow configuration for high viscosity fluids. Large-eddy simulations (LES) of the two-phase flow indicate the unsteady flow character inside the nozzle and its influence on liquid sheet formation. A novel geometric volume-of-fluid (VOF) method by Roenby et al. (2016), termed isoAdvector, is applied for sharp interface capturing. We carry out a Reynolds number sweep (420 ≤ Re ≤ 5300) in order to investigate the link between the asymmetric inner nozzle flow and liquid sheet characteristics in laminar, transitional and fully turbulent conditions. Inside the nozzle, the numerical simulations reveal counter-rotating Dean vortices, flow impingement locations, and strong asymmetric flow features at all investigated Reynolds numbers. A helical, rotating gaseous core is observed when Re ≥ 1660. For laminar flow (Re=420), an S-shaped liquid film is observed, while the gas core presence at Re ≥ 1660 results in a hollow cone liquid sheet. For the intermediate value Re=830, the numerical simulations indicate a liquid sheet of mixed type. Consequences of the inflow asymmetry and Reynolds number to the uniformity of the injected liquid mass distribution and liquid sheet instability are pointed out.",
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Analysis of viscous fluid flow in a pressure-swirl atomizer using large-eddy simulation. / Laurila, E.; Roenby, J.; Maakala, V.; Peltonen, P.; Kahila, H.; Vuorinen, V.

In: International Journal of Multiphase Flow, Vol. 113, 01.04.2019, p. 371-388.

Research output: Contribution to journalJournal articleResearchpeer-review

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T1 - Analysis of viscous fluid flow in a pressure-swirl atomizer using large-eddy simulation

AU - Laurila, E.

AU - Roenby, J.

AU - Maakala, V.

AU - Peltonen, P.

AU - Kahila, H.

AU - Vuorinen, V.

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AB - A computational fluid dynamics study is carried out on the inner nozzle flow and onset of liquid sheet instability in a large-scale pressure-swirl atomizer with asymmetric inflow configuration for high viscosity fluids. Large-eddy simulations (LES) of the two-phase flow indicate the unsteady flow character inside the nozzle and its influence on liquid sheet formation. A novel geometric volume-of-fluid (VOF) method by Roenby et al. (2016), termed isoAdvector, is applied for sharp interface capturing. We carry out a Reynolds number sweep (420 ≤ Re ≤ 5300) in order to investigate the link between the asymmetric inner nozzle flow and liquid sheet characteristics in laminar, transitional and fully turbulent conditions. Inside the nozzle, the numerical simulations reveal counter-rotating Dean vortices, flow impingement locations, and strong asymmetric flow features at all investigated Reynolds numbers. A helical, rotating gaseous core is observed when Re ≥ 1660. For laminar flow (Re=420), an S-shaped liquid film is observed, while the gas core presence at Re ≥ 1660 results in a hollow cone liquid sheet. For the intermediate value Re=830, the numerical simulations indicate a liquid sheet of mixed type. Consequences of the inflow asymmetry and Reynolds number to the uniformity of the injected liquid mass distribution and liquid sheet instability are pointed out.

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KW - Large-eddy simulation

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KW - Pressure-swirl atomizer

KW - Primary atomization

KW - Two-phase flow

KW - VOF

KW - Volume-of-fluid method

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JO - International Journal of Multiphase Flow

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SN - 0301-9322

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