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Abstract
A 3D numerical study of water spray flash evaporation occurring in a positive-pressure saturated vapor environment is conducted. The spray is non-uniform with a Rosin-Rammler droplet size distribution. The characteristics of the flashing spray and vapor flow field are obtained by calculating within the Eulerian-Lagrangian framework. The spray undergoes violent evaporation and significant temperature reduction in the beginning within the vicinity of the nozzle exit. As the spray develops downstream, evaporation becomes moderate. Smaller droplets are found to distribute in the spray central region with a comparatively higher evaporation rate and larger velocity variation. Meanwhile, larger droplets evaporate at a lower speed but cover a wider range. The vapor flow field near the nozzle exit is featured by high velocity and high turbulence intensity. Two sets of vortices with different scales and directions are observed in the upper and lower parts of the chamber.
Published Version
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