Comparació entre dades de simulacions numèriques 3D i experimentals en el procès de generació d’un tren gas-líquid en un capil·lar en forma de “T”

Abstract

This document has been a study of the feasibility of a 3D numerical simulation on a two-phase flow in micro-gravity conditions. Specifically, the mixture of air and water in a T-shaped capillary in the absence of gravity. To accomplish our goals we have set all the parameters for numerical simulations (studio environment, fluids, simulation model...), we have performed tests of convergence for those who required it (temporary jump, mesh) and we have done studies to choose parameters such as the angle of contact between the tube and the interface. Once validated our simulations we performed the study. In this study we analysed the dependence of different parameters (velocity of the bubbles, characteristic lengths, average air volume fraction and frequency generation) with the velocity of the air. Once obtained these characteristic values, we have compared them with theoretical characterizations done by other studies and with results of actual experiments already published. From everything we have achieved in this procedure we have obtained conclusions in three different areas of work. First, we have managed to discover and delve into the world of numerical simulations and check the importance of the choice of parameters. From there we obtained results that have led us to conclude what were the values and trends of our study. And finally, we can also argue and discuss the comparison made with the theoretical characterizations and with the experiments already carried out.