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Communication Dans Un Congrès Année : 2017

Experimental characterization of a canonical coaxial gas-liquid atomizer

A. Aliseda
  • Fonction : Auteur

Résumé

Break-up of a liquid jet by a high speed coaxial gas jet is a frequently-used configuration to generate a high quality spray. Despite its extended use in engineering and natural processes, the instabilities that control the liquid droplet size and their spatio-temporal distribution in the spray are not completely understood. Fundamental understanding of the mechanisms that dominate ligament formation and break-up in the liquid, as well as those that determine the differential transport of droplets in the spray can provide quantitative design and analysis tools for spray engineering. Additionally, detailed understanding is necessary to achieve spray control, in which the break up can be actuated to provide certain preferred droplet size distribution, and the dispersion of droplets from the spray axis can be influenced with acoustic or electric forces to achieve a desired spatial distribution. We present an experimental study of a canonical coaxial gas-liquid atomizer. The liquid injection rate is fixed at a speed of 0.5 m/s (Reynolds number Re l = 1000), while the coaxial gas jet Reynolds number is varied over a wide range 8 × 10 3 < Re g < 2 × 10 6. The resulting droplet sizes distribution is measured using PDPA in the mid-field region, after the break-up of all fluids ligaments is completed and droplets are spherically-shaped. Data on droplet distribution inside the spray is compared with high-resolution particle-laden DNS from our collaborators at U. Florida. The break-up process and the spray development are also characterized in the close-field region using high-speed imaging. These data sets are complemented with X-ray measurements and liquid-gas interface dynamics capturing numerical simulations of the spray shape and void fraction, presented by our collaborators at Iowa State University and Cornell University. This work is part of a large-scale project funded by an ONR MURI to provide feedback control of sprays.
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Dates et versions

hal-02513544 , version 1 (30-03-2020)

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  • HAL Id : hal-02513544 , version 1

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Nathanaël Machicoane, A. Aliseda. Experimental characterization of a canonical coaxial gas-liquid atomizer. ILASS-Americas 29th Annual Conference on Liquid Atomization and Spray Systems, May 2017, atlanta, United States. ⟨hal-02513544⟩
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