Primary & Secondary Atomization

One of the major thrusts in our research group is investigating the fundamental behaviors of liqiud atomization. This process is especially important in liquid-fueled propulsion systems, such as, diesel, gas-turbine and rocket engines. In these devices, the system performance is conditioned by the fuel and oxidizer droplet size distributions, which are usually the rate-controlling processes. Evaporation of fuel (and oxidizer) and the ensuing combustion are accelerated if the droplet size is smaller -- any process leading to a reduction in drop size is of prime importance in combustor design. Thus, immediately after the liquid fuel is injected into the combustion chamber, the liquid stream must be disintegrated into droplets. Many techniques, such as swirling, jet impingement, air-blast atomization, and liquid jet in crossflow are used for this purpose in contemporary liquid-fueled combustion devices. We study these processes to identify fundamental physics of primary and secondary atomization phenomena.

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Liquid Jet in Crossflow Adaptive Mesh Refinement
Liquid Jet Injection Pulsed (20 Hz) Liquid Jet Injection
Impinging Liquid Jets: We = 27.5 Impinging Liquid Jets: We = 440
Oscillatory Breakup of Liquid Droplets Bag Breakup of Liquid Droplets


Relevant Publications
  1. V. Notaro, P. Khare, J.G. Lee, (2018) "Mixing Characteristics of Non-Newtonian Impinging Jets at Elevated Pressures",
    Flow Turbulence and Combustion. DOI: https://doi.org/10.1007/s10494-018-9955-x.
  2. P. Khare, V. Yang, (2015) "Newtonian and Non-Newtonian Liquid Droplet Breakup: Child Droplet Statistics",
    proceedings of ICLASS 2015, 13th Triennial Int. Conference on Liquid Atomization and Spray Systems.
  3. P. Khare, S. Wang, V. Yang, (2015) Modeling of Finite-Size Particles and Droplets in Multiphase Flows",
    Chinese J. of Aeronautics 28(4), 974-982.
  4. P. Khare, V. Yang, "Drag Coefficient of Deforming Liquid Droplets", (submitted to Journal of Fluid Mechanics).
  5. P. Khare, V. Yang, "Generalized Theory of Liquid Droplet Breakup", (submitted to Journal of Fluid Mechanics).
  6. P. Khare, V. Yang, "Breakup of non-Newtonian Liquid Droplets", (submitted to Journal of Fluid Mechanics).
  7. P. Khare, V. Yang, "Breakup of non-Newtonian Liquid Droplets",
    44th AIAA Fluid Dynamics Conference, June 2014, Atlanta, GA.
  8. Prashant Khare, PhD Thesis, "Breakup of Liquid Droplets",
    School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA, May 2014.
  9. P. Khare, V. Yang, "Drag Coefficients of Deforming and Fragmenting Liquid Droplets",
    ILASS-Americas, May 2013, Pittsburgh, PA.
  10. P. Khare, D. Ma, X. Chen, V. Yang, (2012) "Breakup of Liquid Droplets",
    proceedings of ICLASS 2012, 12th Triennial Int. Conference on Liquid Atomization and Spray Systems, ISBN 978-88-903712-1-9.
  11. P. Khare, D. Ma, X. Chen, V. Yang, "Breakup and Dynamics of Liquid Droplets",
    ILASS-Americas, May 2012, San Antonio, TX.
    This paper was awarded William Robert Marshall award for the most significant contribution to ILASS-Americas 24th Anuual Conference on Liquid Atomization and Spray Systems, May 2012.
  12. P. Khare, D. Ma, X. Chen, V. Yang, "Phenomenology of Secondary Breakup of Newtonian Liquid Droplets",
    50th AIAA Aerospace Sciences Meeting, January 2012, Nashville, Tennessee.
  13. X. Chen, D. Ma, P. Khare, V. Yang, "Detailed Physics of Binary Droplet Collision",
    7th US National Technical Meeting of the Combustion Institute, March 2011, Atlanta, Georgia.
  14. X. Chen, D. Ma, P. Khare, V. Yang, "Energy and Mass Transfer during Binary Droplet Collision",
    49th AIAA Aerospace Sciences Meeting, January 2011, Orlando, Florida.
  15. D. Ma, X. Chen, P. Khare, V. Yang, "Atomization and breakup characteristics of liquid sheets formed by two impinging jets",
    49th AIAA Aerospace Sciences Meeting, January 2011, Orlando, Florida.