The physical mechanism of impact wave and mixing process in the atomization of impinging jets are computationally investigated. Using an accurate adaptive solver for surface-tension-driven interfacial flows, the simulations are found to agree well with experiment data for both wavelength of impact wave and droplet size distribution. The formation of impact wave is studied by analyzing velocity profiles and vortices contours of liquid sheet formed by impinging jets. It shows that the impact wave is caused by the interfacial shear stress which forms the capillary waves on the two sides. The interaction of waves on the two sides forces the liquid sheet to resonate at natural frequency. The effect of impact wave to mixing process of both irascible and immiscible impinging jets is also addressed.
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