Comparing Simulations and X-ray Measurements of a Cavitating Nozzle


Daniel Duke , Alan Kastengren,Andrew Swantek,Nicholas Sovis,Kamel Fezzaa,Kshitij Neroorkar,Maryam Moulai,Christopher Powell,David Schmidt


Cavitation plays an important role in the formation of sprays. However, it is difficult to quantitatively measure due to the optical density of the flow, and the small time and length scales involved. Recently, experiments conducted at the Advanced Photon Source (APS) at Argonne National Laboratory (Duke et al, Atomization and Sprays, 2013) have demonstrated the application of raster scan x-ray radiography in to make quantitative path-integrated measurements of void fraction in a 500 micron diameter submerged nozzle. In this paper, we use x-ray radiography data to quantitatively validate new high resolution three dimensional large eddy simulations (LES) of the same flow. A homogeneous relaxation model (HRM) with a thermodynamic lookup table is implemented. Both incompressible and compressible liquid phase models are considered. In addition to quantitative validation with x-ray radiography measurements, comparison is also made with new x-ray phase contrast experiments conducted at the APS. Good agreement is observed between simulations and x-ray measurements. Whilst the x-ray phase contrast measurements are not quantitative in nature, they do reveal fluctuations in the vapor film due to small surface defects which explain much of the observed variation in the radiography data that is not captured in the numerical simulations.



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