Loading...

Numerical modeling of instability and breakup of elliptical liquid jets

Morad, M. R ; Sharif University of Technology | 2020

528 Viewed
  1. Type of Document: Article
  2. DOI: 10.2514/1.J058930
  3. Publisher: American Institute of Aeronautics and Astronautics Inc , 2020
  4. Abstract:
  5. Numerical simulations are performed to provide an in-depth insight into the effect of instabilities on liquid jets discharging from elliptical orifices. The axis-switching phenomenon and breakup are simulated and characterized under the effect of disturbances imposed at the nozzle exit. The simulations are based on the volume of fluid approach and an adaptive meshing. A range of orifice aspect ratios from 1 to 4 at the Rayleigh breakup regime is considered. The evolution of the jet cross section and axis switching under the influence of disturbances is compared with that of nonperturbed elliptical jets. It is found that the axis-switching repetition and breakup length exponentially decrease with the initial amplitude of disturbances. For a fixed amplitude, the optimum wavenumber responsible for minimum breakup length is observed to be dependent on ellipticity of the orifice. Moreover, it is found that the form of final breakup leads to elimination of the satellite droplets at the optimum wavenumbers, while the droplet size decreases and becomes more uniform. © 2020 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved
  6. Keywords:
  7. Aspect ratio ; Jets ; Liquids ; Numerical models ; Orifices ; Adaptive meshing ; Axis-switching ; Breakup regimes ; Elliptical jets ; Elliptical liquid jets ; Fixed amplitude ; Satellite droplets ; Volume of fluids ; Drop breakup
  8. Source: AIAA Journal ; Volume 58, Issue 6 , June , 2020 , Pages 2442-2449
  9. URL: https://arc.aiaa.org/doi/10.2514/1.J058930