Abstract
The impact process and the consequent two-phase interaction for a compressible subsonic starting gas jet colliding on a multi-plume spray are investigated using large eddy simulation with Eulerian/Lagrangian multiphase approach, and the λ 2 criterion is used to visualize the temporal and spatial evolution of the vortical structures in the gas field. It is shown that before the impact a leading tip vortex ring is followed by smaller vortex rings in the quasi-steady region of the starting jet while the vortical structures inside the spray plumes known as spray-induced air jets are formed. After the impact the leading tip vortex ring and the following rings as well as spray-induced air jet vortices start to deform and eventually break down into smaller elongated vortex filaments. Unlike the injection of multi-plume sprays into the core of a steady cross flow gas jet, spray droplets are dispersed in a larger volume in all directions when impacted by the starting gas jet, beneficial for two-phase mixing enhancement. A pair of vortex rings is also observed merging into a new ring before reaching the impact zone.
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This research is supported by Ontario Research Fund-Research Excellence Program under contract # ORF-RE-02-019 and Natural Sciences and Engineering Research Council of Canada (NSERC) via a Discovery Grant.
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Ghasemi, A., Li, X. Vortex break-down during the impact of a starting subsonic compressible gas jet on a multi-plume spray. J Vis 19, 679–689 (2016). https://doi.org/10.1007/s12650-016-0345-y
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DOI: https://doi.org/10.1007/s12650-016-0345-y