Simulation of the bubble formation dynamics in rheologically complex fluids

摘要

A new theoretical model was developed for describing the bubble formation at an orifice submerged in rheologically complex fluids. The equations of motion for the gas-liquid interface were combined with the thermodynamic equations for the gas in the bubble and the chamber below the orifice as well as the fluid rheological equation. The present model is able to calculate the instantaneous shape of the bubble during its formation and determine the final size of detachment. The results predicted by this model compare satisfactorily with the experimental investigation.