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Development of bubble coalescence and breakup models for Euler-Euler Two-fluid modeling
A literature study on the effects of surfactants and salts on bubbly flows were done to inhibit the coalescence process and to analyze the breakup models. An improved closure model for bubble breakup in wake was developed using the direct numerical simulations of bubble breakup in various flow conditions and with the aid of high speed camera images from FRAME(a bubble column) test case. Finally the model was validated and benchmarked for fixed polydisperse bubbly flows and for the flows with breakup and coalescence against the experiment results from FRAME. This model is an integral part of the iMUSIG model(inhomogeneous MUltiple SIze Group model) and GENTOP model(GENeralized TwO Phase model - DNS and Euler-Euler coupled multiscale model for high void fraction regime multiphase flows). (Hydra cluster was used for simulations)
This project was done under the guidance of Dr. Dirk Lucas and Dr. Roland Rzehak and was supported by the Government of Germany through Helmholtz-Zentrum Dresden-Rossendorf fellowship.
Bubble breakup in wake observed in the FRAME setup
Simplified model for bubble breakup in wake
Benchmarking for bubble breakup models against the FRAME experimental results