Análisis numérico del proceso de cambio de fase del refrigerante R660a durante el proceso de evaporación en tubos horizontales

Abstract

The project contains three chapters, the first is the collection of information from more recent investigations, together with the learning of it, different flow patterns are defined, which delimit regions in flow patterns maps. Different flow pattern maps according some authors are defined on this chapter, in order to predict several two-phase flow regimes in horizontal tubes, which serve to identify the flow patterns during the evaporation process at different mass velocities, heat fluxes and pressure of saturation. Main components of the flow pattern map are mass velocity on the vertical axis and vapor quality on the horizontal axis. Chapter two shows equations encountered by different methods of algebraic solution, made by several authors such as Kattan, Steiner, Thome and Wojtan, among others, which become the most significant researchers in the flow patterns map area, during the evaporation process in horizontal tubes. Starting from variables of quality, temperature and heat flux, in order to obtain dimensionless values of peripheral and transversal area of the pipeline, thus the limits of flow patterns of each author for their respective delimiting graphical interpretation are obtained. In the last chapter, results are showed, using the most accuracy methodology to predicts the flow patterns maps, which was presented by Wojtan, the flow patterns obtained from experimental data are presented, a comparison with the graphs obtained from other refrigerants and future improvement of the machine used for data collection. Heat flux being a low data that should be realized, if it is going to be compared to previous studies.