We have used the integral form of the conservation equations, to find a cubic formula for the drop size during in liquid sprays in coflow of air (air-blast atomization). Similar to our previous work, the energy balance dictates that the initial kinetic energy of the gas and injected liquid will be distributed into the final surface tension energy, kinetic energy of the gas and droplets, and viscous dissipation. Using this approach, the drop size can be determined based on the basic injection and fluid parameters for “air-blast” atomization, where the injected liquid is atomized by high-speed coflow of air. The viscous dissipation term is estimated using appropriate velocity and length scales of liquid–air coflow breakup. The mass and energy balances for the spray flows render to an expression that relates the drop size to all of the relevant parameters, including the gas- and liquid-phase velocities and fluid properties. The results agree well with experimental data and correlations for the drop size. The solution also provides for drop size–velocity cross-correlation, leading to computed drop size distributions based on the gas-phase velocity distribution. This approach can be used in the estimation of the drop size for practical sprays and also as a primary atomization module in computational simulations of air-blast atomization over a wide range of injection and fluid conditions, the only caveat being that a parameter to account for the viscous dissipation needs to be calibrated with a minimal set of observational data.
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December 2019
Research-Article
Determination of the Drop Size During Air-Blast Atomization
T.-W. Lee,
T.-W. Lee
Department of Mechanical and
Aerospace Engineering,
SEMTE Arizona State University,
Tempe, AZ 85287-6106
Aerospace Engineering,
SEMTE Arizona State University,
Tempe, AZ 85287-6106
Search for other works by this author on:
J. E. Park
J. E. Park
Department of Mechanical and
Aerospace Engineering,
SEMTE Arizona State University,
Tempe, AZ 85287-6106
Aerospace Engineering,
SEMTE Arizona State University,
Tempe, AZ 85287-6106
Search for other works by this author on:
T.-W. Lee
Department of Mechanical and
Aerospace Engineering,
SEMTE Arizona State University,
Tempe, AZ 85287-6106
Aerospace Engineering,
SEMTE Arizona State University,
Tempe, AZ 85287-6106
J. E. Park
Department of Mechanical and
Aerospace Engineering,
SEMTE Arizona State University,
Tempe, AZ 85287-6106
Aerospace Engineering,
SEMTE Arizona State University,
Tempe, AZ 85287-6106
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received November 20, 2018; final manuscript received April 19, 2019; published online May 23, 2019. Assoc. Editor: Wayne Strasser.
J. Fluids Eng. Dec 2019, 141(12): 121301 (6 pages)
Published Online: May 23, 2019
Article history
Received:
November 20, 2018
Revised:
April 19, 2019
Citation
Lee, T., and Park, J. E. (May 23, 2019). "Determination of the Drop Size During Air-Blast Atomization." ASME. J. Fluids Eng. December 2019; 141(12): 121301. https://doi.org/10.1115/1.4043592
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