Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
INVESTIGATION OF BUBBLE BREAKUP IN SUDDEN EXPANSIONS AND CONTRACTIONS
Submission Author:
Cristian Mauricio Potosi Rosero , RJ , Brazil
Co-Authors:
Cristian Mauricio Potosi Rosero, Gustavo Eduardo Oviedo Celis, Juliana Loureiro, Atila Pantaleão Silva Freire
Presenter: Cristian Mauricio Potosi Rosero
doi://10.26678/ABCM.COBEM2017.COB17-2241
Abstract
The dynamics of bubble breakup and coalescence in expansions and contractions located in vertical pipes are studied in this work. The experimental apparatus has a total of 10.5 m height and is composed by sudden expansion followed by a contraction. Three gas flow rate conditions are selected for the investigation of the properties of the two-phase flow across two consecutive local accidents. In particular, flow pattern transitions due to breakup and coalescence are studied. Particle Image Velocimetry and Shadow Sizing techniques were used to characterize the continuous and dispersed phases, respectively. Information about bubble velocity, velocities of the nose, body and tail of Taylor bubbles, bubble size, statistics of diameter and mean liquid velocity are presented in this work. Turbulence statistics are developed to identify areas of high turbulent kinetic energy and compare them with the breakup locations.
Keywords
Two-phase Flow, Expansion, Contraction, breakup, Coalescence
