Numerical analysis of bubble dynamics in different gravity environments
Tutor / director / evaluatorGonzález Cinca, Ricardo
Document typeMaster thesis
Rights accessRestricted access - confidentiality agreement
The separation of phases in a multiphase fluid mixture is significant in aerospace applications. The controlling of multiphase flows is therefore investigated numerically in this thesis. It is assumed that a gas bubble immersed in a liquid is subject to an acoustic field at different gravity levels. In the computation, the equations for radial oscillations and translational motion will be solved simultaneously with a numerical solver. While most of the numerical investigations of bubble phenomena deal with the radial bubble behavior and thus, the heat exchange, only a few studies were conducted on the translational motion. While the behavior of air bubbles immersed in water in an acoustic field parallel to gravity is well evaluated, the translational motion of vapor bubbles in liquid hydrogen has not been investigated so far, as well as the behavior of bubbles in different gravity environments. Here the rise of bubbles in micro and hypergravity conditions are discussed. Finally, the bubble motion is investigated in an acoustic field perpendicular to gravity. The results obtained in this thesis will be the first steps towards a numerical code with the capability of fully controlling the vertical and horizontal position of a bubble within an acoustic field.