A model for predicting two-phase flow patterns transitions in annulus: inclinations from horizontal to near-vertical

Name: Marciellyo Ribeiro de Oliveira
Type: MSc dissertation
Publication date: 16/12/2021

Namesort descending Role
Marcio Ferreira Martins Advisor *

Examining board:

Namesort descending Role
Humberto Belich Junior Co advisor *
Leandro Silva Amorim Internal Examiner *
Marcio Ferreira Martins Advisor *
Rogério Ramos Internal Examiner *

Summary: The concomitant flow of a mixture containing two phases is a complex phenomenon. One of the reasons is that the phases` interactions depend on the variations of the operational condition imposing the formation of different flow patterns that, in its turn, can undergo pattern transition depending on the geometric cross-section change. This paper proposes a model for any annulus inclination from horizontal to near-vertical and considers a concentric condition as a particular case of a pipe. The outcome is a generalized two-phase flow pattern maps function of dimensionless parameters. The transitions stratified smooth/stratified wavy, stratified wavy/annular dispersed liquid, stratified/intermittent, annular dispersed liquid/intermittent, and intermittent/dispersed bubble are investigated influenced by the tube inclination. Also, mathematical relations for calculating the shear stress and velocity profile in annuli under inclinations are developed. A new methodology based on geometric parameters helped obtain the wetted area and perimeters, reducing the classical set of equations.

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