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Study on the Effect of Jets Geometry in Liquid Atomization Based on Nonlinear Stability Analysis

[+] Author Affiliations
Sajad Jafari

Sharif University of Technology, Tehran, Iran

Taravatsadat Nehzati

Norwegian University of Science and Technology, Trondheim, Norway

Paper No. GT2018-75603, pp. V04AT04A048; 10 pages
doi:10.1115/GT2018-75603
From:
  • ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition
  • Volume 4A: Combustion, Fuels, and Emissions
  • Oslo, Norway, June 11–15, 2018
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5105-0
  • Copyright © 2018 by ASME

abstract

In this paper, nonlinear instability of an elliptical jet is investigated by considering the impacts of orifice geometry variations using regular perturbation method. In the breakup mechanisms, created disturbances on the jet interfaces will grow owing to the nonlinear dynamics of fluid. In this study, a scrutiny of nonlinear cylindrical jet breakup is done initially. Next, Cosserat equations as a low order form of Navies-Stokes equations are solved on the nonlinear form to exert the impacts of orifice deformation on various aspect ratios. These nonlinear equations, Cosserat equations, are linearly solved in the past papers. As a result, the dispersion equation is derived to find the most unstable wavelength as well as the breakup length. Results reveal that the elliptical jet with low aspect ratio is more unstable rather than cylindrical jet with aspect ratio of one. Furthermore, the nonlinear equations can predict the break up length of elliptical jet more accurate than linear equations. The predicted results are shown to be in good agreement with the experimental results.

Copyright © 2018 by ASME
Topics: Stability , Jets , Geometry

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