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Primary atomization regimes in two planar coflowing fluid sheets using Gerris
Daniel Fuster (DALEMBERT)
This work investigates the appearance of instabilities in two planar coflowing fluid sheets. We distinguish three different regimes as a function of the dynamic pressure ratio and the ratio between the gas boundary layer thickness and the splitter plate thickness. At low dynamic pressure ratios the frequency of the waves appearing in the primary atomization region is influenced by the liquid velocity, whereas an asymptotic regime is obtained for large dynamic pressure ratios. In this regime, the gas velocity and the ratio between the gas boundary layer and the thickness of the separator plate influence the observed frequency. Current computational results are in agreement with new experimental observations performed by the LEGI group at Grenoble. The distinction of regimes as a function of the momentum ratio is discussed in terms of the convective/global nature of instability.

