Determinação do padrão de escoamento em tubulações para aplicação em sistemas de refrigeração

Abstract

The present study shows flow pattern maps for a vertical pipe, in the surface velocity range of liquid from 0.05-15 and for gas from 0.01-100 m/s. To investigate vertical flow, the transition of flow patterns is modeled on a circular test section with an inner diameter of 0,3mm, 1,0mm, 5,0mm, 12,7mm and 25,4mm. Multiphase flow is found in many places, such as in the oil, chemical, nuclear, space and other industries. Thus making it an important topic for study because it is present in the reality of engineering and in the production system of large industries. In flow systems the internal flow that occurs for most of the cycle is a two-phase flow, liquid and steam. Studying the fluid flow pattern in the evaporator helps to understand the formation of porous ice on the outer wall of the tube and contributes to improving the efficiency of the automobile. Transitions of flow patterns in a vertical pipe are tested in force interaction experiments and verified experimentally. The objective of this study is to use numerical analysis tools to determine flow regimes in pipes for transit application. The results were compared with the Taitel and Dukler flow regime map obtaining good agreement. Keywords: bifasic flow; evaporator; flow patter map.